Abstract
1. 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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