论文部分内容阅读
在工业生产、教学实验和科学研究中,经常进行铁的测定。经典的重铬酸钾滴定法,不仅滴定剂本身毒性较大,而且需要用剧毒的二氯化汞来消除过最的还原剂,从而造成对环境的汞污染和铬污染。这两种污染对人民健康都是十分有害的。例如,每分析一个铁样,一般使用10毫升饱和二氯化汞溶液,其中含有480毫克左右的汞。按排放水含汞最高允许量规定,至少需要9.6吨水稀释,才可将废液排放。显然,采用大量水稀释的办法,是不可行的。
In industrial production, teaching experiments and scientific research, often iron determination. The classic potassium dichromate titration method is not only highly toxic, but also requires the use of highly toxic mercury dichloride to eliminate the most reductant, resulting in mercury and chromium contamination of the environment. Both types of pollution are very harmful to people’s health. For example, for each iron sample analyzed, 10 ml of saturated mercury mercuric chloride solution is typically used, which contains about 480 mg of mercury. According to the provisions of the maximum allowable mercury content of discharged water, at least 9.6 tons of water diluted before they can discharge waste. Obviously, using a lot of water dilution is not feasible.