Separation and identification of Group IV cations on the semimicro scale

As in the macro scale, two methods are recommended for the separation of Group IV cations the sulphate method is the generally accepted procedure even in semimicro scale, but the nitrate method is equally suitable. The two methods are outlined in Tables VI. 17 and VI. 18 respectively. 

Ba absent. Discard the portion used in testing for barium, and employ the remainder of the solution (B) in testing for strontium and calcium after heating on a water bath for a few minutes to expel C02. 

Wash with hot water. Dissolve in a few drops concentrated HC1, evaporate almost to dryness in a small crucible, and apply the flame test. 

Adjust volume to 2 ml (solution D) by evaporation or dilution as necessary. 

Either - To 1 ml solution, add 1 ml saturated (NH4)2S04 solution followed by 0-1 g sodium thiosulphate, heat on a water bath for 5 minutes, and allow to stand for a short time. Centrifuge. 

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