On comparing the potassium ethyl xanthate and the sodium diethyldithio-carbamate methods for estimating copper the latter was found to be preferable because ( a ) It is at least twice as delicate, ( b ) The reagent is absolutely colourless, ( c ) In very dilute solution ferric iron causes little or no disturbance. 2. Estimation of copper may be carried out by electro-deposition from one litre of sea-water at about 90-100° C. for three hours at 2.0 volts with subsequent re-solution and colorimetric estimation using the carbamate method. 3. In agreement with the spectroscopic determinations of Dieulafait in 1879, it was found that sea-water contains about 10 mg. per cubic metre of copper.
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W. R. G. Atkins (1932) studied this question.
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