Separations involving sulphides : separation of arsenic,molybdenum and tellurium from mercury

It has been shown that it is possible to determine arsenic, molybdenum m tellurium in tlic presence of mercury by decomposing in one portion the thiosalt of mercury alone with ammonium acetate and in another portion the thioaalts of both the metals with hydrochloric acid.     

Seperations involving sulphides : Separation of alkaline earth metals from some elements that form sulphides

It has been shown that 2N sodium sulphide reagent can be used efficiently for separating. 1.Barium from rhenium, platinum, gold, bismuth, palladium, lead or cadmium. 2.Strontium, calcium and magnesium from rhenium, platium, gold, mercury, bismuth, palladium, lead or cadmium     

Estimation of metals as sulphides : Estimation of bismuth,cadmium, lead,and indium

1. It has been shown, that under proper conditions bismuth, cadmium, lead and indium can be precipitated quantitatively as pure sulphides by alkali sulphides and the precipitate weighed directly for the estimation of the motal. 2. In the case of bismuth ammonium sulphide gives a pure precipitate of Bi₂0₃ which is washed with hot water and weighed directly. 3. In the case of cadmium sodium sulphide gives a pure orange coloured precipitate of the Bulphide which is washed with water and without any further treatment, weighed as CdS. 4. In the case of lead the solution is treated with alkali sulphide, the mixture is then acidified with. acetic acid and the pure precipitate of PbS after washing with water weighed directly without heating. 5. In the case of indium treatment with ammonium sulphide gives a pure precipitate of In₂S₃ which after washing and heating can be weighed directly for the estimation of the metal. Equally good results are obtained if the mixture is acidified with acetic acid after treatment with ammonium sulphide. 6. The given procedures provide for a convenient, quick and accurate estimation of the metals.     

Separations involving palladium: Separation of lead,bismuth, cadmium,thallium, copper,cobalt and nickel from palladium

It has been shown that 1% dimethylglyoxime solution in alcohol can be efficiently used to separate quantitatively palladium from other metals of the copper group, as indicated in the new and more comprehensive scheme of qualitative analysis.     

Separations involving sulphides : Separation of (a) bismuth,lead and cadmium from mercury,and (b) bismuth and mercury from indium

It has been shown that 2N sodium sulphide reagent can be successfully used in the seperation and estimation of: (a) bismuth, lead and cadmium from mercury, and (b) bismuth and mercury from indium     

Separations involving sulphides : Separation of rhenium and antimony from mercury

It has been shown that it is possible to estimate rhenium or antimony in the presence of mercury by decomposing their thiosalts but not platinum, gold. selenium and tin.     

Separations involving sulphides : Separation of platinum,gold, selenium,arsenic, rhenium and molybdenum from lead

It has been shown that it is possible to determine platinum, gold, selenium, arsenic, rhenium or molybdenum in the presence of lead with 2N sodium sulphide reagent but not tellurium, antimony and tin.     

Separations involving sulphides: Separation of ruthenium and indium from alkaline earth metals

It has been shown that 2N sodium sulphide reagent can be efficiently used for separating ruthenium or indium from alkaline earth metals.     

Separations involving sulphides

Summary It has been shown that 2 N sodium sulphide reagent can be used efficiently for separating pentavalent antimony from the alkaline earth metals.