| OCR Text |
Show ANjrrYTIGAL The of all 1ff.ETHOnS trea#ad Qlres: USED. 'j'lerrehm.o'e the Utah c.om]?·J[ex. sulphide me thO':ds, analyti.caJ. advisable used. were to. inc o.rJ;? eza te T 0: tal ore;s aI'l an them' i.:n less" representative or and. t them 'J i. t Q'! this as cc , HeI and; ho.i.l. (O,f ne.c_;:es:sary add 5 5-:10 of H2S04 avo,lve,d.. Cool cc , with dil..ut.e in sodi urn 5 _ ce, III' sulphides Ie-ad. IOf HN03 ce more add 30 CC. H2S04 ace t.O hot, wat.er.. Diss,o,lv:e aa.t uea't.ed. brine cc • Add. J 150 , Now add water and J hoiling or Filter and wash the Acid 10 lead, CC. suLpha.te o.f f±.l t.er· and. wash wi th Lead chr-oma.t e in Hel cc I:f copi.ously ar-e Dt sr:mTVJe.: hoiling. re-sist n:e,ating. 0,]:, wate,r and. hea.n t,Q and hert WB_:ter. ta.se and, neat .. again. and. boil until white: fumes. t that and, ecntd.nue and, heart. Her , flask and. add a r emaan pot,assi um chz-oma.t.e and hoil 7 minutes, 150 total the; unt:il: the fe:rric, su"pha.:t,e, has dd s s.e.Lved., too deemed. follows: trea.tme:nt. a.dd. this, was Leadi.. We.igh 0.5 gram O''I:' the samldle into 20 same theei 5. The met.hod. used fo.r dLetermining was the a.s 100 mix:t:,ure;.(1000 CO:. HCI) OC. and. di luiie ]!'otas,s:ii. um :ii odi d.e, and ti trat e agaf.nat, Sodi um Thi.osuj..pha;t,e using starch Ta.tal s o.Lu t Lcn as an indic:ator. Zi.nc,. The, method used for tio te.L zinc was as follows: |
