FAO/PL:1967/M/11/1 WHO/Food Add./68.30 1967 EVALUATIONS OF SOME PESTICIDE RESIDUES IN FOOD THE MONOGRAPHS The content of this document is the result of the deliberations of the Joint Meeting of the FAO Working Party of Experts and the WHO Expert Committee on Pesticide Residues, which met in Rome, 4 - 11 December, 1967. (FAO/WHO, 1968) FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS WORLD HEALTH ORGANIZATION Rome, 1968 DIELDRIN This pesticide was evaluated by the 1966 Joint Meeting of the FAO Working Party and WHO Expert Committee on Pesticide Residues (FAO/WHO, 1967). Since the previous publication additional information on the identity of dieldrin and the results of additional experimental work have become available. This new information and work is summarized and discussed in the following monograph addendum. IDENTITY Other relevant chemical properties Per cent Technical dieldrin contains: HEOD 87.0 other polychloroepoxyoctahydro dimethanonaph thalenes (endrin) 3.5 HHDN 2.0 octachlorocyclopentene 0.4 hexachloroethane less than 0.1 hexachlorobutadiene 0.5 carbonyl compounds (1) 2 toluene 0.6 benzene none acetic acid 0.2 other compounds (2) 3.7 (1) At least three carbonyl compounds are indicated by the infrared spectra. The quantitative approximation was made on the assumption that these compounds are ketones, aldehydes and acids derived from HCCPD and HHDN. (2) Primarily a complex mixture of compounds formed by polymerization of HCCPD and BCH during the aldrin reaction. EVALUATION FOR ACCEPTABLE DAILY INTAKES Biochemical aspects 1 In the rabbit, the urine is the major route of excretion of dieldrin and its metabolites, while in the rat, faecal excretion is more important; the principal metabolite detected in rat faeces is a mono-hydroxy substitution product (Hunter, 1966). A ketone metabolite of dieldrin has been found in the urine of rats, dogs and man. In contrast to the rabbit, transdihydroxy aldrin is not present in significant amounts in rat urine following administration of dieldrin (Hunter, 1966). Dieldrin was found in the urine of five men and five women with no occupational exposure to chlorinated hydrocarbon insecticides. In the men, the mean concentration was 0.0008 ppm (range 0.0005-0.0014) and in the women, 0.0013 (range 0.0011-0.0019). In five men with high occupational exposure, the mean concentration was 0.0514 ppm (Cueto and Biros, 1967). The mean whole-blood concentration of dieldrin in ten men with no history of occupational exposure to dieldrin was 0.0014 ppm, with 61 per cent carried in the serum. The mean concentration in erythrocytes was 0.0005 ppm (Dale et al., 1966). In 12 men with 3 to 12 years' high occupational exposure to dieldrin, the overall mean whole blood concentration was 0.08 ppm, with mean extremes of 0.036 to 0.118 ppm (Jager, 1967). Acute toxicity Photoisomerization product of dieldrin Dieldrin Animal Route LD50 LD50 (mg/kg body-weight) (mg/kg body-weight) Mouse oral 6.8 77.3 Rat oral 9.6 46.8 Guinea-pig oral 2.3-3.9 18-30 Pigeon oral 75-100 250 Chicken oral 80 48 Pheasant oral 90 - Dog, male oral 120-160 120 Dog, female oral 80-120 80-100 (Brown et al., 1967) 1 For further information see p. 109. The overall mean concentrations of dieldrin in quail and pigeons of both sexes succumbing to single doses or high subacute feeding levels were : 17.4 ppm (95 per cent limits, 15.9-19) and 20 ppm (18.1-22) in the brains, respectively; and 40 ppm (34.7-46.2) and 45.6 ppm (37.5-55.5) in the livers (Robinson et al, 1967) The results of studies of convulsion thresholds for strychnine and Leptazol in mice dosed orally with 15-60 mg/kg of dieldrin suggested that central, but not peripheral, nervous transmission is facilitated in acute poisoning (Natoff, 1967). Short-term studies Mouse. Groups of five males and five females were fed 1, 3 and 10 ppm of the photoisomerization product of dieldrin for one month. There was no survival at 10 ppm and 2 animals died at 3 ppm. No apparent abnormalities were seen at autopsy (Brown et al., 1967). Rat. Groups of four males were fed 0 and 200 ppm of dieldrin for 4-14 days and 2000 ppm of phenobarbital for 4-28 days. Similarly another group was fed the control diet for 4-28 days after 12 days' pre-treatment at 200 ppm. Similar ultracellular responses were seen in the dieldrin and phenobarbital treated rats, in the appearance of lipospheres in the hepatic cells, and the progressive marked accumulation of vesiculated smooth endoplasmic reticulum. Striking increases in the hydroxylation activities of liver microsomes were seen after only four days on the test diet. Examination of single animals suggested that the ultracellular hepatic structure had returned to normal 14 days after removal from the test diet, and that the microsomal hydroxylation activity was not different from controls after 28 days (Hunter, 1967). A three generation reproduction study was conducted, with groups of 10 males and 20 females, and two litters produced per generation, at dietary levels of 0, 0.1, 1 and 2 ppm of dieldrin. Successive generations were composed of second litter animals. Parental animals in each generation were examined grossly and complete autopsies with histological examination were performed on selected 21 day old F3b animals. Twenty-one day mortality was significantly raised in the F1a pups at the 2 ppm level. No effect was seen at other levels or in other generations at 2 ppm, nor was any adverse effect seen in general appearance and behaviour, number of litters produced, average number of pups per litter, weights of parents and offspring, organ weight ratios and organ pathology, at any level (Hine, 1967). Groups of five males and five females were fed 3 and 10 ppm of the photoisomerization product of dieldrin for up to one month without apparent ill-effect. The biological half-life of the product was calculated to be 1.7 and 2.6 days for male and female rats, respectively, and the fat storage ratios were 0.45-0.47 and 0.76-1.8 respectively (Brown et al., 1967) Monkey. Groups of five male rhesus monkeys (with one female added to the control group) were fed 0, 0.01, 0.1, 0.5, 1 and 1.5-5 ppm of dieldrin for 36 months. The study was continuing. The highest level of feeding was started at 5 ppm and was reduced to 2.5 ppm after 4 months, and then to a calculated 1.75 ppm at the 9th month. Two animals died in this group, the first in the 4th month, with no cause attributed at post mortem (liver content of dieldrin, 10 ppm, muscle content 2.2 ppm); and the second died in the 6th month of "endocrine failure", with a dieldrin content of 9.4 ppm in the brain and 0.15 ppm in whole blood. The intake in a surviving animal from this group was then progressively increased to 5 ppm. One monkey in the 1.0 ppm group had a progressive anaemia. Blood samples from all groups showed evidence of the presence of pyrethrum and piperonyl butoxide, a formulation used in the laboratory for pest control. Use of the formulation was then discontinued (Zavon, 1966; Zavon et al., 1967). Dog. Groups of five males and five females, plus two supplementary animals of each sex at each dose level for EEG recording were given daily doses of 0.005 and 0.05 mg/kg/day of dieldrin for 52 weeks. The study was scheduled to continue for 2 years. Plasma alkaline phosphatase activity was significantly elevated in the high dose group from the 30th week. There was no difference in BSP retention between this group and the controls. No differences in general appearance or haematogical findings were noted between the groups. It is believed that whole blood levels of dieldrin in the 0.005 mg/kg/day group stabilized between the 12th and 18th weeks at around 0.008 ppm. Whole blood levels in the 0.050 mg/kg/day group had risen to about 0.05 ppm by the 18th month and remained somewhat slightly below that level (Hunter, 1966; 1967). Long-term studies Dog. A lifetime feeding study on dieldrin had been in progress for 253 weeks, using one male and one female at 0 and 0.2 mg/kg/ body weight/day. Plasma alkaline phosphatase activity was greatly elevated in the test animals at 134 and 215 weeks. Whole blood dieldrin content is reported to have peaked at about the 50th week in the test animals to about 0.4-0.5 ppm and by the 225th week was down to 0.065-0.08 ppm. No difference between groups had been seen in general health and behaviour, haematology, BSP retention and examination of urine (Hunter, 1966; 1967). Observations in man Groups of three adult males were given daily doses of 0, 0.01, 0.05 and 0.21 mg of dieldrin for 18 months. None of the subjects showed signs of ill health and the results of clinical observations, measurement of serum alkaline phosphatase and erythrocyte and plasma cholinesterase activities, EEG and ECG recordings and electromyographic studies remained within normal limits during the test period. The blood and adipose tissue concentrations of dieldrin were found to be proportional to the daily dose, and it was believed that concentration equilibria were reached in the blood and adipose tissues during the 10th to the 18th months and the 9th and the 15th months respectively. It was concluded that the ratio of concentration in blood to concentration in the fat is about 1:156. The average adipose tissue concentration at the high level was 2.15 ppm vs. 0.21 ppm in the subjects before the test period. During this period no significant changes in tissue concentrations of DDT or DDE were seen (Hunter and Robinson, 1967). Comments Additional studies have shown that dieldrin produced no adverse effect in man given 0.2 mg/day for 18 months, and that 1.0 ppm was a no effect level in the monkey fed this amount for 36 months. However, studies have reflected a possible tumorigenic effect in mice. Also, there is a recent finding of a photoisomeration product of dieldrin, and for which no long-term toxicity studies have been reported. The Committee therefore adhered to the toxicological evaluation published in the last report1 which is repeated below. TOXICOLOGICAL EVALUATION Estimate of acceptable daily intake for man 0 - 0.0001 mg/kg body weight2 Further work required Adequate data on the tumorigenic potential of dieldrin Toxicological studies on the photoisomerization product of dieldrin See also General Comments p. 3 and 4. EVALUATION FOR TOLERANCES RESIDUES RESULTING FROM SUPERVISED TRIALS Seed treatment of vegetable and grain crops leads in general to insignicant residues in the crop (0.02 ppm or less). (CCPR 1967a). FATE OF RESIDUES General considerations Roburn, 1963, reported on an unknown compound on dieldrin-treated grass. This product is also formed by UV-irradiation on glass plates. Other unidentified compounds are formed as by-products (Scharf, 1963). Preparation of dieldrin conversion products in solution was described by Bird, 1961. 1 FAO, PL:CP/15; WHO/Food Add./67.25 2 Sum of aldrin and dieldrin by weight. The main irradiation product of dieldrin - called U.V.C.P. or P.I.P.D. occurs occasionally and in very small amounts. Concentration of P.I.P.D. in the Environment (Robinson at al. 1966) Nature of Sample Average concentration Detection HEOD in of P.I.P.D. in ppa limit ppm English mutton fat 0 - 0.004 0.001 0.07 Australian mutton fat none detected 0.0001 0.01 Argentine corned beef 0 - 0.0018 0.002 0.015 - 0.16 Crude edible oils and fats none detected 0.004 - 0.05 0.05 Whole cooked meals none detected 0.001 0.02 Human fat (pooled) none detected 0.00005 0.4 Shag eggs (pooled) none detected 0.0001 2.1 Forage beet foliage 0.02 0.09 Although P.I.P.D. is more toxic to some species than is HEOD (Brown et al, 1967), from these concentrations of P.I.P.D. it is tentatively concluded that the possible conversion of dieldrin by sunlight does not lead to significant increase of residues arising from use of dieldrin. The average dietary intake of dieldrin per person per day in the U.S.A. based on a food consumption rate of 4.4 kg per day is as follows : Daily Intake milligrams mg/kg body-weight 1964-5 1965-6 1966-7 1964-5 1965-6 1966-7 aldrin 0.001 0.002 0.001 0.00001 0.00002 0.00001 dieldrin 0.005 0.007 0.004 0.00007 0.00009 0.00006 Limited studies in southern England indicate the average dietary intake per person to be nearly 20 micrograms per day. (Robinson and McGill, 1966). Intake/person/day by air is about 0.2 micrograms and by drinking water 0.1 micrograms. The following table gives a survey of estimated daily intake and storage of dieldrin in occupationally exposed workers after an average of 2,562 hours of exposure (Hayes 1967) : Plasma Fat Urine Workers Storage (ppm) 0.0411 9.48 0.024 (excreted) Intake (mg/man/day) 1.00 1.10 0.72 General Population Storage (ppm) 0.0019 0.29 0.0008 (excreted) Intake (mg/man/day) 0.025 0.025 0.025 The following table shows the average concentration of dieldrin in body fat of the general population in various countries : Country Year Storage level References in ppm U.S.A. 1961-1962 0.15 ) U.S.A. 1962-1963 0.11 ) U.S.A. 1964 0.31 ) U.K. 1961-1962 0.21 ) Hayes, 1966 U.K. 1963-1964 0.26 ) U.K. 1964 0.21 ) India 1964 0.04 ) France 1960-1961 - Hayes and Dale, 1963 Holland 1964 0.15 Wit, 1964 Australia 1962-1963 0.05 Bick, 1967 W. Germany 1960 n.d. Maier-Bode, 1960 Belgium 1966 n.d. Maes, 1966 New Zealand 1966 0.27 Brewerton, 1967 In plants Metabolism of dieldrin in higher plants still has not been reported. Matsumura and Boush, 1967, isolated 10 Pseudomonas, Trichoderma and Bacillus sp. strains with high dieldrin-metabolizing activity from various insecticide-treated soils and found metabolism rates up to 88 per cent. Aspergillus and Penicillium (Korte et al, 1962) as well as other fungi and Actinomycetes (Chacko et al, 1966) did not metabolize dieldrin. In animals Dieldrin is metabolized like aldrin by mammals (Mörsdorf et al, 1963; Korte et al, 1963; Brooks, 1966; Korte et al, 1966; Richardson et al, 1967) to less toxic hydrophilic products which are excreted in faeces and urine. In animals this process at a given intake level results in the establishment of an equilibrium storage level. Repeated daily doses of 4.3 micrograms of aldrin-C14 (equivalent to 0.2 ppm in the diet) to male rats leads to a saturation level which reaches a value as high as 0.15 ppm in the body. After 50 days, approximately the entire activity administered daily was also excreted daily which means that a saturation level was reached by that time. Subsequent oral doses did not lead to a higher concentration of the total insecticide in the rat. Up to 70 per cent of the activity found in the faeces and up to 95 per cent of that found in the urine consisted of metabolites. After administration ceased, the concentration in the body declined rapidly. Half the activity present had been excreted, mainly as metabolites, after 10 days and three quarters after 21 days. The time required to reach saturation is somewhat longer for female rats and the rate of decline is slower (Korte et al, 1963). Dieldrin is readily taken up by fish (bluegill and goldfish), and more than 80 per cent eliminated during a recovery period of two weeks (Gakstatter et al, 1967). Determination of residues in liver, meat and fat of sheep, both after various pre-grazing intervals and after various grazing periods following pasture treatment with dieldrin, showed that a suitable combination of pre-grazing interval and grazing period can be established, which will lead to negligible residues (CCPR 1967a). However, prior to 1966, mean residues of dieldrin in mutton fat in Great Britain were 0.4 ppm, caused by sheep dipping. Dieldrin residues in butter from Australia, Denmark, New Zealand and the United Kingdom were in the range from 0.01 to 0.03 ppm; in beef kidney fat from Argentina 0.15 ppm and from the United Kingdom 0.04 ppm (Report of the Government Chemist, 1964, 1965, 1966). Feeding studies with poultry, using very high dosages of dieldrin, have shown that under such conditions depot fat and egg residues occur. A study of residues under practical intake conditions has not been reported (CCPR, 1967a). In storage and processing Under some conditions of usage, dieldrin residues can appear in oil-producing crops, such as soybeans, cotton seed etc. All such crops can be processed using methods which effectively eliminate the residue from the oil and meal products (Smith et al, 1967). Viel et al, 1967, reported a 75 per cent reduction of residues by peeling and processing carrots. The first carbonation juice in processing sugar beets contained only 1.3 to 3.6 per cent of the residues originally present in the beets (Walker et al, 1965). Generally it has been shown that residue levels of dieldrin are reduced on peeling (Lichtenstein et al, 1965; Stewart et al, 1965). The residue levels of chlorinated pesticides in potatoes and carrots are reduced up to 90 per cent on peeling (Robinson and Bush, private communication). Cooking of a hen carcass in water for three hours reduced the chlorinated insecticide residue content up to 90 per cent (Liska et al, 1967). NATIONAL TOLERANCES Country Tolerances, ppm Crop Canada 0.1 asparagus, barley, carrots, celery, corn, cranberries, eggplants, flax, grapes, horseradish, oats, onions, parsnips, peppers, plums, potatoes, prunes, radishes, red currants, rye, strawberries, tomatoes, wheat. 0.25 apples, apricots, beets, beet tops, broccoli, Brussels sprouts, cabbage, cantaloupes, cauliflower, cherries, cucumber, gourds, kale, kohlrabi, lettuce, marrow, muskmelons, peaches, pears, pumpkins, rutabagas, spinach, squash, turnips, watermelons, winter squash. German Federal Republic The residue on edible crops may not exceed the lower limit of detectability of the analytical method. Netherlands 0.1 * fruit and vegetables aldrin and dieldrin * The Netherlands tolerances listed in the Residue decree include the toxic metabolites and breakdown products. In the case of aldrin, dieldrin is considered as the main metabolite. In consequence of this a residue of aldrin + dieldrin together may not exceed the 0.1 ppm level. (cont'd) Country Tolerances, ppm Crop Sweden 0.1 fresh fruits, fresh berries, dieldrin vegetables including potatoes. Switzerland 0.1 potatoes dieldrin U.S.A. Tolerances are for total residues of aldrin and its epoxide dieldrin, resulting from the application of aldrin or dieldrin in or on raw agricultural commodities. 0.1 in or on apples, apricots, asparagus, aldrin and bananas, broccoli, Brussels sprouts dieldrin cabbages carrots, cauliflower, cherries, cranberries, cucumbers, eggplants, grapes, horseradish, lettuce, mangoes, nectarines, onions, parsnip, peaches, pears, peppers, pimentos, plums (fresh prunes), potatoes, quinces, radishes, radish tops, salsify roots, strawberries, summer squash, sweet potatoes, tomatoes. zero in or on alfalfa, beans, black-eyed peas, cantaloups, clover, collards, corn grain, corn forage, cowpeas, cowpea hay, endive (escarole), garden beets, garden beet tops, grain sorghum, grain sorghum forage, kale, kohlrabi, lespedeza, mustard greens, peas, pea hay, popcorn, rutabagas, salsify tops, spinach, soybeans, soybean hay, Swiss chard, turnips, turnip tops. Additional tolerances for residues of dieldrin are established, on an interim basing pending referral to an advisory committee. 0.1 in or on stray of barley, oats, rye and wheat. 0.05 in or on grapefruit, lemons, limes, oranges and tangerines. 0.02 in or on grains of barley, oats, rye and wheat. RECOMMENDATIONS FOR TOLERANCES AND PRACTICAL RESIDUE LIMITS Temporary tolerances Since the 1966 FAO/WHO Joint meeting, the first extensive data on total diet studies (Duggan, 1967) have become available from the U.S.A. showing that the actual intake of aldrin and dieldrin is about 60 times lower than that calculated from the tolerances established in U.S.A. In the light of the new data presented at this meeting, the temporary tolerances listed in the following table are recommended for combined residues of aldrin and dieldrin in commodities moving in international trade. Commodity Temporary tolerance, ppm Fresh vegetables 0.1 (from intentional and approved use) and in so far as aldrin or dieldrin have to be and are allowed to be used in individual countries on specific crops within this category. Fresh fruits 0.1 Citrus 0.05 Rice 0.05 The recommended temporary tolerances are based on the requirements for good agricultural practice and are of the same order of magnitude as those in effect at present in the U.S.A. Practical residue limits The meeting noted the comments made by some member countries of the Codex Committee on Pesticide Residues (CCPR, 1967b) on needs for practical residue limits, but did not have data available on the actual residues in these products from most of the countries concerned. However, in a review of previous actions, the meeting agreed to recommend a temporary revision as follows : Total Combined Residue Aldrin plus Dieldrin, ppm Cereal grains (except rice) - 0.02 Milk, whole - 0.005 Total Combined Residue Aldrin plus Dieldrin, ppm Milk products (fat basis) - 0.125 Meat (fat basis) - 0.2 In the absence of experimental residue data, the meeting did not recommend practical residue limits for egg yolk, a subject which has to be reconsidered when new data are available. FURTHER WORK Further work required before 30 June 1972 Data should be provided by countries on residues actually being found in various foods. Further work desirable The fate of both aldrin and dieldrin should be reinvestigated, including metabolism of these insecticides in plants. Additional data on food residues outside the U.S.A, would be useful to include residue data in egg yolk and meat. A continuing study of human fat residues and actual human intake is desirable. REFERENCES PERTINENT TO EVALUATION FOR ACCEPTABLE DAILY INTAKES Brown, V.K., Robinson, J. and Richardson, A. (1967) Unpublished report submitted by Shell International Chemical Company. Cueto, C. jr and Biros, F.J. (1967) Toxicol. appl. Pharmacol., 10, 261 Dale, W.E., Curley, A. and Cueto, C. jr (1966) Life Sciences, 5, 47. Hine, C.H. (1967) Unpublished report submitted by Shell International Chemical Co. Hunter, C.G. (1966) Unpublished report submitted by Shell International Chemical Co. Hunter, C.G. (1967) Unpublished report submitted by Shell International Chemical Co. Hunter, C.G. and Robinson, J. (1967) Unpublished report submitted by Shell International Chemical Co. Jager, K.W. (1967) Unpublished report submitted by Shell International Chemical Co. Natoff, I.L. (1967) Unpublished report submitted by Shell International Chemical Co. Robinson, J., Brown, V.K.H., Richardson, A. and Roberts, M. (1967) Unpublished report submitted by Shell International Chemical Co. Zavon, M.R. (1966) Unpublished report submitted by Shell International Chemical Co. Zavon, M.R., Tye, R. and Stemmer, K.L. (1967) Unpublished report submitted by Shell International Chemical Co. REFERENCES PERTINENT TO EVALUATION FOR TOLERANCES Bick, M. (1967) Chlorinated hydrocarbon residues in human body fat. Med. J. Australia, June 3, 1127-1130. Bird, C.V., Cookson, R.C., Crundwell, E. (1961) Cyclizations and re-arrangements in the isodrin-aldrin series. J. Chem. Soc., 4809-4816. Brewerton, H.V., McGrath, H.J.W. (1967) Insecticides in human fat in New Zealand. New Zeal. J. Sci. 10 : 486-496. Brooks, G.T. (1966) Progress in metabolic studies of the cyclodiene insecticides and its relevance to structure-activity correlations. World Review of Pest Control 5 : 62-84. Brown, V.K., Robinson, J., Richardson, A. (1967) Preliminary studies on the acute and sub-acute toxicities of a photoisomerisation product of HEOD (Dieldrin). For submission to Archiv für Toxikologie. CCPR. (1967a) Aldrin and dieldrin. Working paper prepared by the Netherlands Delegation for the Second Session of the Codex Committee on Pesticide Residues, The Hague. CCPR 67/12. CCPR. (1967b) Report of the Second Session of the Codex Committee on Pesticide Residues, The Hague. SP 10/115. Chacko, C.J., Lockwood, J.L., Zabik, M. (1966) Chlorinated hydrocarbon pesticides - degradation by microbes. Science 154 : 893-895. Duggan, R.E., Dawson, K. (1967) Pesticides: A report on residues in food. FDA Papers, 1: 1-6. Duggan, R.E., Weatherwax, J.R. (1967) Dietary intake of pesticide chemicals. Science 157 : 1006-1010. FAO/WHO. (1967) Evaluation of some pesticide residues in food. FAO, PL:CP/15; WHO/Food Add./67.32. Gakstetter, J.H., Weiss, C.M. (1967) The Elimination of DDT-14C, dieldrin-14C and lindane-14C from fish, following a single sub-lethal exposure in aquaria. Trans. Amer. Fish. Soc. 196 : 301-307. Hayes, W.J. Jr. (1966) Monitoring food and people for pesticide content. Scientif. Aspects of Pest Control, 1402 : 315-342. Hayes, W.J. Jr. (1967) Storage and excretion of dieldrin and related compounds : Effect of occupational exposure. Presented at the Symposiums on the Science and Technology of Residual Insecticides in Food Production with special reference to Aldrin and Dieldrin, Washington, Nov. 2-3, sponsored by Shell Chemical Co. Korte, F., Kochen, W. (1966) Insektizide im Stoffwechsel : XI. Ausscheidung, Verteilung und Umwandlung von Aldrin-14C und Dieldrin-14C in der Ratte. Med. Pharmacol. Exp. 15 : 404-408. Korte, F., Ludwig, G. Vogel, J. Stiasni, M., Rechmeier, G., Kochen, W. (1963) Metabolic studies with 14C-labelled drin-insecticides. Vth International Pesticide Congress, London. Lichtenstein, E.P., Myrdal, G., Schulz, K.R. (1965) Translocation of insecticidal residues from contaminated soils into five carrot varieties. J. Agr. Food Chem. 13 : 126-131. Liska, B.J., Stemp, A.R., Stadelman, W.J. (1967) Effect of method of cooking on chlorinated insecticide residue content in edible chicken tissues. Food Technol. 21 (3A): 117A-120A. Maes, R., Heyndrickx, A. (1966) Distribution of organic chlorinated insecticides in human tissues. 8th Int. Symp. Phytopharm. Ghent. Maier-Bode, H. (1960) DDT in the body fat of the human being. Med. Exp. 1 : 146. Matsumura, F., Boush, G.M. (1967) Dieldrin : degradation by soil microorganisms. Science 156 : 959-961. Mörsdorf, K., Ludwig, G., Vogel, J., Korte, F. (1963) Die Ausscheidung von Aldrin-14C und Dieldrin-14C sowie ihrer Metaboliten durch die Galle. Med. Exp. 8 : 90-94. Reports of the Government Chemist, London (1964, 1965, 1966). Richardson, A., Baldwin, M., Robinson, J. (1967) The identification of metabolites of HEOD in rat faeces and urine. In press. Robinson, J., McGill, A.E.J. (1966) Organochlorine insecticide residues in complete prepared meals in Great Britain during 1965. Nature 212 : 1037. Robinson, J., Richardson, A., Bush, B., Elgar, E. (1966) A photo isomerization product of dieldrin. Bull. Environ. Contam. Toxicol. 1 : 127-132. Roburn, J. (1963) Effect of sunlight and ultraviolet radiation on chlorinated pesticide residues. Chem. Ind. 1555-1556. Scharf, D. (1963) Reported in : Korte, F. et al (1963) : metabolic studies with 14-C labelled drin-insecticides. Vth International Pesticide Congress, London, July 1963. Smith et al. (1967) Removal of pesticides from crude vegetable oils. Report presented to U.S. Dept. of Agriculture and the U.S. Food and Drug Administration, July 1967. Stewart, D.K.R., Chisholm, D., Fox, C.J.S. (1965) Insecticide residues in potatoes and soil after consecutive soil treatments of aldrin and heptachlor. Can. J. Plant Sci. 45 : 72-78. Viel, G., Hascoet, M. (1967) Sur la présence d'insecticides chlorés dans certaines productions francaises de carottes at d'aliments à base de carottes. Paper delivered at the 6th International Congress of Plant Protection, Vienna. Walker, K.C., Maitlen, J.C., Onsager, J.A., Powell, D.M., Butler, L.I., Goodban, A.E., McCready, R.M. (1965) The fate of aldrin, dieldrin and endrin residues during the processing of raw sugar beets. USDA Bulletin ARS 33-107, Aug. Wit, S.L. (1964) Einige aspecten van de toxicologie en chemische analyse van bestrijdingsmiddeln-residus. Voeding, 25:609.
See Also: Toxicological Abbreviations Dieldrin (ICSC) Dieldrin (PIM 575) Dieldrin (FAO Meeting Report PL/1965/10/1) Dieldrin (FAO/PL:CP/15) Dieldrin (FAO/PL:1968/M/9/1) Dieldrin (FAO/PL:1969/M/17/1) Dieldrin (AGP:1970/M/12/1) Dieldrin (IARC Summary & Evaluation, Supplement7, 1987) Dieldrin (IARC Summary & Evaluation, Volume 5, 1974)