CYHEXATIN JMPR 1975
In the 1973 JMPR (FAO/WHO, 1974) practical residue limits for
cyhexatin (under the name of tricyclohexyltin hydroxide) of 0.2 mg/kg
in meat and 0.05 mg/kg in milk and milk products (fat basis) were
established in addition to tolerances in citrus and manufactured tea,
both at 2 mg/kg. At the 1975 Meeting of the Codex Committee on
Pesticide Residues, questions were put to the Joint Meeting for
clarification as to why the above mentioned limit for meat was
established for the whole product, whereas for milk and milk products
it was on a fat basis (Alinorm 76/24, para. 174).
In response to the question raised by the CCPR, the Meeting has
reviewed the previously supplied data on cyhexatin in meat and milk
and milk products. It is confirmed that the different methods of
expressing residue limits in the two commodities reflects the actual
situation which occurs and which was reported by previous Meetings.
From the monographs of the FAO/WHO, 1971, it can be seen that while a
quantitative partitioning of cyhexatin into milk fat is evident and
thus justifies a limit on that basis, this is not the case for meat
products. Rat studies as well as cattle feeding demonstrates that
residues in body fat generally are lower than in meat, liver and
On this basis, therefore, it is the opinion of the Meeting that
the present proposals should be maintained.