论文部分内容阅读
很多支持电解质都适合于作铋的逆向溶出伏安法测定。我们选取了0.5M高氯酸,0.2M盐酸和10~(-5)M硝酸汞为底液。在-0.25伏处预电解富集。用硝酸、高氯酸混合液加热处理试样,可将锑完全转化为5价,而消除锑的干扰。硒、砷含量高时有干扰,可以盐酸蒸发除去。 1.天然水中铋的测定取1或0.5升天然水(河水、井水、自来水等)加入20毫升硝酸,热至70—80℃,加入20毫克La~(3+)[La(NO_3)_3]或Al~(3+)[AlCl_3]作为载体,用氨水中和至
Many supporting electrolytes are suitable for the determination of bismuth by reverse-stripping voltammetry. We selected 0.5M perchloric acid, 0.2M hydrochloric acid and 10 ~ (-5) M mercury nitrate as the bottom liquid. Pre-electrolysis enrichment at -0.25 volts. With nitric acid, perchloric acid mixture heat treatment of the sample, the antimony can be completely converted to 5, while eliminating the interference of antimony. Selenium, arsenic high interference, hydrochloric acid can be removed by evaporation. 1. Determination of bismuth in natural water Take 1 or 0.5 liters of natural water (river water, well water, tap water, etc.) by adding 20 ml of nitric acid and heating to 70-80 ° C, adding 20 mg of La 3+ [La (NO 3) 3 ] Or Al ~ (3 +) [AlCl_3] as a carrier, neutralized with ammonia