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本文利用铁(Ⅲ)和四氢硼酸钠作试剂,并控制溶液的pH,来进行无机汞和有机汞的分别定量。作者发现用四氢硼酸钠还原氯化汞(Ⅱ)时,可在从5 N硫酸酸性到5 N氢氧化钠的强碱性溶液中进行,而且加铁不加铁都得到一致的吸光度。另一方面,如不加铁(Ⅲ)并使pH在2以上,特别是在pH 10以上的碱性溶液中氯化甲基汞(MMC)和醋酸苯汞(PMA)完全不被还原。若加入铁(Ⅲ),则在pH2～8的范围内可
In this paper, iron (Ⅲ) and sodium tetrahydroborate were used as reagents and the pH of the solution was controlled to quantify inorganic and organic mercury respectively. The authors found that reduction of mercury (II) chloride with sodium borohydride can be carried out in a strongly basic solution of 5 N sulfuric acid to 5 N sodium hydroxide, with the same absorbance added without iron plus iron. On the other hand, neither methylmercury chloride (MMC) nor phenylmercuric acetate (PMA) was completely reduced without addition of iron (III) and the pH was above 2, especially at pH 10 or above. If iron (III) is added, it is within the range of pH 2-8