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我们采用砷酸作底液,示波极谱测定砷中微量硒,此方法较简便,灵敏度亦较一般方法为高,但测定结果的重现性不够理想。经试验,观察到HCl、HNO_3、A_s(Ⅲ)、H_g(Ⅱ)、O_2等均对本法有干扰,在注意消除这些干扰后,拟定了一个简便、可靠的分析方法,可测定低达0.006ppm的硒。试验部分 (一)主要试剂及仪器硒标准溶液:称取0.5克硒(99.999％),溶于10毫升硝酸中,移入500毫升容量瓶中,用水稀至刻度。此溶液每毫升含1毫
We use arsenic acid as the bottom, oscillopolarographic determination of trace amounts of arsenic in arsenic, this method is simpler, the sensitivity is also higher than the average method, but the reproducibility of the measurement results are not ideal. After the experiment, it is observed that HCl, HNO3, A_s (III), Hg (II) and O2 are all interfering with this method. After paying attention to eliminating these interferences, a simple and reliable analytical method was developed, which can measure up to 0.006ppm Selenium. Experimental part (A) of the main reagents and equipment Selenium standard solution: Weigh 0.5 grams of selenium (99.999%), dissolved in 10 ml of nitric acid, transferred to 500 ml volumetric flask, diluted with water to the mark. This solution contains 1 milliliter per milliliter