The sulphides can be removed by " oxidizing " them into thiosulphates by means of atmospheric air, with or without the assistance of other agents, such as manganese peroxide; or by " carbonating " them with lime-kiln or other gases containing carbon dioxide; or by precipitating them with lead or zinc oxide. [Please select]
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The sampling should be performed expeditiously to prevent carbonating, and portions placed in a stoppered bottle. [Please select]
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