AOAC Methods in Codex STAN 234 (Preliminary Methods Review)

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JOURNAI, OF THE A,().A.C. (Vol. 43, No. 3, W

mining sodium dichloroplwnoxycthyl sulfate be cuntinued. (22) That study of the first action Arn.– mite method be continued by tests on agrl– cultmaJly treated crops. (2:3) That study of the method for chloro– bcnr.ihttc, dei.-:cribcd in the Associate Referee's report of last yea.r, be continued. (24) That, the studies b(1 cont,ima~d on tlw following pe::;ticidc chemicals: dichlone (l'hygon), 2,4-diclorophcnoxyacetic acid and it:- e:;t,•r:.::, dioldrin, endrin, maleic hydrnzidc, and <·arbmnnfo pcHticidc::; and organic phos– phatt>:; ( t>m:yme met.hods). (2:,) Th.it ,;t ncly of clH'miMI and fl,1me HJ><'drophotomctric cktennination of sodium in foods be rontinucd. (2H) That methods be: studied for deter– mination of cyanidt! residues. (27) That extraction studies for chloro– or~nnic nntl organic phosphate pesticide rcsit!ucr; be continued on agriculturally t.rentcd cropR. (28) That, the method for piperonyl butoxide on wheat described by t-lie A8sociate Hcfrm: br ndopted first :wt.ion and that. tho i:

Chlorbcnside, 2,4-dichloro-(o-chlorrw1i · triazine (Dyrene), ethylene oxide, gut · and Schmclan. (32) That studies on determinati1Ju kelthane be continued. (33) Thn.t study of the method for ,,r described by the Assomate Referee iu year's report be continued. (34) That the formula in section 24,fll (b) of the colorimetric dithizone mr: X = a + LY be correot,od to read Y ::: o. + bX. (35) That the extraction procedure l pnrntbion described in t.hc paper by I.. J. Ford nnd R. T. Ottes be adopted as . alternate extmction proN~dure first ad1oa, (36) That study of the dinitro 1~ pesticides be cont.inned on quamit:1ri methods to accompany the pnper chro:1 ! togrnphic qualitative procedures dosrrit" _jn the Associate Referee's report. (37) Tlmt the quantitative metho1l & p:lyodin residues on o.pples be studiod cc laboratively and that extension of tho mtthr4 to other frnits be studied. (aS) That study of both the diJ)hcuy1 mine and thiourea colorimetric methods f toxuphcne described by the Ai,:sociatC' u~, circo be further stmlietl. (30) That the first action diethyl didii•,– C',nbnmatc method for copper be drop aml the versen:tte-cui·bamato met.hod J scribed by the Referee be adopted l:r,t nction.

A Comparison of Procedures for the Extraction of Parathion front Leafy Vegetables*

l~y L. A. FORD nnd R. T. OTTES (Food and Drug Aclminist,rntion, Dcpnrtment of Tle.. !I~ Education, and Welfare, Wa.shingt-0n, D.C.)

Briefly Klein's method as udaptecl ia ); follows: Successively blend the sample w:th one vohnnc of isopropyl alcohol, then two volumes of benzene. Centrifuge t,he mixtt:re and wash solids with one volume benzeJJ•. Remove tho ::1leohol by washing the extrai·L with five volumes water. Dry the bcmeue; extract and dilute to a specific volume.

This :,;t.udy was undertaken to determine whc:t.her the ml1t,hod developed by Klein (1) for ext,rnct.ing DDT rMidnes fro111 leafy V\igetabh·R could be successfully employee! as it substitute for the AOAC extraction pro(lmluro for parnthion. • Pn•st,if

Codex Trial Method Review