Mefenpyr-diethyl TC

MEFENPYR-DIETHYL TECHNICAL MATERIAL

FAO Specification 651.229/TC (May 2011*)

This specification, which is PART ONE of this publication, is based on an evaluation

of data submitted by the manufacturer whose name is listed in the evaluation report

(651.229/2010). It should be applicable to relevant products of these manufacturers

but it is not an endorsement of those products, nor a guarantee that they comply with

the specifications. The specification may not be appropriate for the products of other

manufacturers. The evaluation report (651.229/2010) as PART TWO forms an

integral part of this publication.

1 Description

The material shall consist of mefenpyr-diethyl together with related

manufacturing impurities, in the form of white to beige crystalline powder, and

shall be free from visible extraneous matter and added modifying agents.

2 Active ingredient

2.1 Identity tests (CIPAC CIPAC/4627/A, Note 1)

The safener shall comply with an identity test and, where the identity remains

in doubt, shall comply with at least one additional test.

2.2 Mefenpyr-diethyl content (CIPAC CIPAC/4627/A, Note 1)

The mefenpyr-diethyl content shall be declared (not less than 940 g/kg) and,

when determined, the average measured content shall not be lower than the

declared minimum content.

3 Relevant impurities (Note 2)

Note 1: The reversed phase HPLC method (CIPAC/4627/A) for the determination of mefenpyrdiethyl

in TC, and the normal phase HPLC method (CIPAC/4627/B) for the determination of

mefenpyr-diethyl in WG, OD, EW and EC were adopted by CIPAC in 2008. Prior to their

publication in Handbook N, copies of the methods may be obtained through

http://www.cipac.org/cipacpub.htm

Note 2 There are no relevant impurities to be controlled in products of the manufacturer identified in

evaluation report 651.229/2010. However, ethyl-2-chloro-2-(2,4-dichloro-phenylhydrazono)

acetate may occur as a result of certain manufacturing processes. If this impurity

would occur at ≥ 1 mg/kg (relative to mefenpyr-diethyl) in the products of other

manufacturers, it would be designated as relevant impurity and a clause would be required

to limit its concentration.