AOAC Methods in Codex STAN 234 (Preliminary Methods Review)

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l!\JbJ.ff : :VlETALS, ELEMENTS, AND RESIDUES IN F'OODS

n. nwt.horl which employed dl:,:;l.i!Jatwn and chromatographic separa,t.ion of the diphcnyl from the oil, foll.owed by spectrophotometric determination. Goocl results were obtnincd by one collaborator and the Associate Ref– eree. Another member of the Division of Food made several determinations using the meth– od; otherwise no adclil,ionn.I eollaborntive work wn.s clone this year. Associate H.efrrcc, W. 0. Winkler, Jt'ood aud Drug Achninistrn,– tion, Wnshington, 25, D.C., rnports that. results showed very good recoverirdane re– coveries.

111g Admini~trntion, and the prop()sed cor– "'~l ion concurred in by William Weiss, J.11i~ricia11 of the FDA. M,mganese.-No changes.

Mercury.-No changes. Srlr,rium.-N o changes. Tiu.-No changes. Zi1 1 ri.-No changes.

Ai1hough the tin method, and possibly the 1or method, appear to need revision in light 1,f rrrent advances in methodology, no Asso- t1·,11• Hcferee::. have studied these met.hods !or ~cvcrn.l year:,; and hence there is not "1Npmtc basis for recommending changes. :l!t(rin and Dfoldrin.-A procedure was pr •,cnted by ,L D, Sheehan, Food o.nd Drng A1lmi11.istration, Washington, D.C., for sep– u~1mg aldrin ancl dicklrin when mixtures ,f the two are encountered. A limited 1mo1rnt of testing was done where known 1rno1111ts (Jf aldrin and dicldrin were n.dded ·., regetable extracts. The recovery data, t1•t 1 ,l on fly bioassay, were good. Paper tl.rr,1Mtogra.phy was used for idenlific,it.ion. Fi~her Scientific Company's nluminn., No. .1.~.10, was uniformly satisfactory as an ad– l11rheut.. A preliminary purification was 11,•ccssary since the alumina column cannot hr· used as a general purifi'irlt1cs of Ara.mite is zero, it is only neces– &~r.1· to clcmonstrntc qunlitativcly that a mirlue is definitely present. Stripping sp11r~rs to he quite adc,quMe for t,his pur– pn,c. Br.nzene Hexa.chloride.-No changes. Br 11 zene ll exachlol'ide (technical) n.nd "!i11rlane, distinclion between.-No changes. /Jiphenyl.-Thc report last year outlined