Abstract
CLARK'S method1,2 for determining very small amounts of tin makes use of the red-coloured suspension produced when dithiol (4-methyl-l,2-di-mercaptobenzene) is warmed with an acid solution containing the tin. In its present form, the method has a serious disadvantage, in that it is necessary to compare visually the depth of colour (with that of standards) by means of reflected light. This technique imposes an unduly low limit on the precision obtainable, and full advantage of this promising method will not be gained until it can be adapted for photo-electric absorptiometry.
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References
Clark, R. E. D., Analyst, 61, 242 (1936).
Clark, R. E. D., Analyst, 62, 661 (1937).
Stone, I., Indust. Eng. Chem., Anal. Ed., 13, 791 (1941).
de Giacomi, R., Analyst, 65, 216 (1940).
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KENYON, C., OVENSTON, T. Absorptiometric Determination of Tin by means of Dithiol. Nature 167, 727 (1951). https://doi.org/10.1038/167727a0
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DOI: https://doi.org/10.1038/167727a0
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