Western Mill And Smelter Methods of Analysis a Practical Laboratory Handbook Fo

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Western Mill And Smelter Methods of Analysis a Practical Laboratory Handbook Fo
Philip Henry Argall
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Fifty cc. Of the cyanide solu- tion are taken, and 5 cc. Of the above indicator added. The liquid is titrated with standard AgNO 3 (6. 519 grams per litre) until a distinct yellow coloration is obtained, disregarding any white turbidity. This lat- ter may sometimes be removed by adding NH 4 OH, MILL AND SMELTER METHODS. 65 which in moderate amounts does not affect the ac- curacy of the test : i cc. Of AgNO 3 used equals . 01% KCN (equiva- lent to total cyanide).
7. Estimation of HCN* Estimation
... of free HCN in presence of alkaline cyanides and of zinc double cyanides : (a) The free cyanide is first estimated in the or- dinary way without addition of alkali. It is assumed that the presence of free HCN does not affect this te- sult.
(b) Another portion of the liquid is mixed with a solution of potassium or sodium bi-carbonate con- taining no normal carbonate or free CO 2 . The mix- ture is titrated with AgNO 3 as before, the reaction as regards HCN being: 2HKC0 3 +AgN0 3 +2 HCN KAg(CN) 2 +KN O 3 +2 CO 2 +2 H 2 O.


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