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无火焰原子吸收法,已普遍用于地面水中汞的测定。对于各种工业废水中总汞的测定,一般要将有机汞转化为无机汞并消化水样中的有机物。水中有机汞的消化以往多用硝酸—硫酸—高锰酸钾回流法,由于方法烦琐,目前已很少应用。至于用高锰酸钾—硫酸室温消化法,对氯化甲基汞的回收往往较差,用重铬酸钾—硫酸消化法,结果亦不理想。近年来采用了高锰酸钾—硫酸—过硫酸钾消化法,则多认为此法较好。 另外,Deitz根据Malaiyanai推荐的五氧化二钒—硝酸—硫酸消化食品中微量汞所制定的方法,由于简便已为国内一些单位所采用。而本文则试图对这一方法,进行进一步的探讨,以便使之适用于工业废水的分析。通过实验证明,这一改进是切实可行
Flameless atomic absorption method has been widely used for the determination of mercury in surface water. For the determination of total mercury in various industrial wastewaters, organic mercury is generally converted to inorganic mercury and digested organic in water samples. In the past digestion of organic mercury in the past with nitric acid - sulfuric acid - potassium permanganate reflux method, due to cumbersome methods, has been rarely used. As with potassium permanganate - sulfuric acid digestion at room temperature, the recovery of methylmercury chloride is often poor, with potassium dichromate - sulfuric acid digestion, the result is not satisfactory. In recent years, the use of potassium permanganate - sulfuric acid - potassium persulfate digestion, then think this method is better. In addition, Deitz based on Malaiyanai recommended vanadium pentoxide - nitric acid - sulfuric acid to digest food trace mercury method, due to its simplicity has been adopted for some domestic units. However, this article attempts to further explore this method in order to make it suitable for the analysis of industrial wastewater. Experiments show that this improvement is feasible