ZQ mt of a solution containing Q,O,I mg mcrcrtry ant1 about 5 ml :V ttisodium citrate is titrated at plr C-L 7 wit11 o.c~z~;V p-dimcthylamino-bcnxylidcnc-rhodanine. l, Irt cttralc or tartrillc h0l11tlon~ mercury fornlctl tilrce tllflcrcnt ccilnpJl~nds with p~llnwtllyl-.trtiifto-ItcnxylitIcnc-rllotl;ttttncl tit pt *x25, r *7 ilIlt! %a) 'I')lCcf,mlJowltlon Of the Comp~J~lnt~~lSt~lSCl~s~C~~. 1. Analyttcrtl mctltctctw iire prescnCccl fttr tltc clctcrmtn;tt:cin of 0 z mg mercury 1x1 tff ml sc2lutton WfIlct, C0t-lt:MllX~ 'JCJ 5-'J1J 'J':i, fotcrgn metals 111 rnrast C;lbC+ tltc c'sror lay hetwcen rcro itllti I':;,. 'l'lw forci~n tncL;llt~ wcrc Ca, 13:~. Alfi, %n, &In, XI, C'CI, Al, Cr( I I I), Vo( I II), Cd. ('II, I'IJ, rr(vr), 'I'1(1),'I'h, Cc(1 I I), Sl,(lLI) ;~ntl 131(1 I I). hlctl~otln for tlwclctcrmlnatron do. J mg mcrcttry~tt fpAcl(ll I), l't('f), l'cl(1 I) and stlvcr ilW :tiho prCw2Ittccl.
l%phcnyl, the lowest mcmbcr in the polyphcnyl scrics, is one of the more heat stable organic compounds. Along with biphclnyl oxide, it is used in industry as a heat transfer medium, unclcr the name of Dowthcrm. 'Cllc three isomcric terphcnyls and the higher polyphcnyls are cxpoctetl to be carefully invest&at& in the future, some in combination with biphenyl as heat transfer mcclia.
IVcliminary pyrolysis expcrimcnts on p-tcrl)hcnyl inclicatctl that one of the byproclucts is biphcnyl and that higher polymers' are to bc cspcctcd when polyphcnyls are hcatccl over long pcriocls of time. The determinatio~i of small amounts of biphcnyl in the prcscncc of large amounts of p-tcrphcnyl and associatccl polyphcnyls was the object of this rcscarch. -_---.._ * Tltis report is txisccl on sttidks cctttcluclctl fur Clw Atottttc: Ihcr gy Commissiott tlntlcr Contract A'F-1