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GSC colorimetry – Gutzeit method: As
Geological Survey of Canada, colorimetry using the Gutzeit method, to determine As, potassium hydroxide fusion in nickel crucibles
A weighed amount of the sample is fused with potassium hydroxide and leached with metal-free water. The resulting alkaline solution is acidified with hydrochloric acid and then diluted to 10 millilitres with metal-free water.
An aliquot of this solution is transferred to an arsine (AsH3) generator and, in the presence of stannous chloride, the arsenic is liberated as arsine by the action of nascent hydrogen. The nascent hydrogen is produced when zinc pellets are added to the acidified aliquot. The arsine and any other liberated gases are allowed to pass upward through a column packed with glass wool impregnated with lead acetate. The lead acetate is used to trap hydrogen sulphide that may be liberated from the solution. The gases then pass through a piece of mercuric-chloride paper, clamped in place over the top of the column. The arsine coming in contact with the paper imparts a yellow stain, the intensity of which is a measure of the quantity of arsenic in the original aliquot. The stained part of the paper is then compared with artificially prepared standards.
[Lynch, J.J., Mihailov, G. (1963). Field and laboratory methods used by the Geological Survey of Canada in geochemical surveys, No. 3: Method for determining arsenic. Geological Survey of Canada, Paper 63-8.]
Sample material: solid
Sample weight: unstated
|Index||Method Order||Method ID||Quantity||Detection Limit|
Associated Analytical Packages:
|Index||Package ID||Package Name|
|1||272||GSC spectrography and colorimetry|
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