1. A brief survey is given of the methods for the estimation of mercury by means of dithizone.2. The precautions necessary in mercury estimations are outlined and the stability of dithizone in chloroform solutions shown to be satisfactory.3. Data are presented on the rate of extraction of copper, from sea-water solutions, at low pH values with chloroform and carbon tetrachloride solutions of the reagent. Using the former solvent the rate of extraction of copper is shown to be slow, while mercury is rapidly extracted under the same conditions.4. The use of potassium cobalticyanide in combination with a chloroform solution of dithizone has enabled a method to be developed which eliminates interference of copper in mercury estimations; with the procedure given, mercury in concentrations of 1 to 55µg/l. may be determined in the presence of copper concentrations up to 69 mg./l.5. Copper may be determined in the same solution subsequent to the mercury estimation by the use of sodium diethyldithiocarbamate, after the solution has been made alkaline with ammonium hydroxide.

中文翻译：

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用双硫腙法估算含铜中微量汞的海水溶液

1.简要介绍了双硫腙测定汞的方法。 2．概述了汞估计中必要的预防措施，双硫腙在氯仿溶液中的稳定性令人满意。 3．提供了关于在低 pH 值下用试剂的氯仿和四氯化碳溶液从海水溶液中提取铜的速率的数据。使用前一种溶剂提取铜的速度较慢，而在相同条件下提取汞的速度较快。 4．将钴氰化钾与双硫腙的氯仿溶液结合使用，可以开发一种消除铜对汞估算的干扰的方法；根据给定的程序，汞的浓度为 1 到 55µg/l。可在铜浓度高达 69 mg./l.5 的情况下测定。用二乙基二硫代氨基甲酸钠进行汞估算后，在溶液用氢氧化铵碱化后，可在同一溶液中测定铜。