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分光光度法测定微量锰(Ⅱ)多采用萃取法,因为该法空白值低、干扰小,但操作复杂。直接测定水溶液中锰(Ⅱ)的方法有空白值高、干扰大的缺点。作者研究了用难溶于水的铋酸钠把锰(Ⅱ)氧化成高锰酸离子,除去过量的铋酸钠后加入碘化物,用测定生成的碘的吸光度来定量微量锰。本法与广泛使用的高锰酸盐法和甲醛肟法相比具有灵敏度高,且锌(Ⅱ)、镍(Ⅱ)、铅(Ⅱ)、镉(Ⅱ)、钴(Ⅱ)等对测定干扰小
Spectrophotometric determination of trace manganese (Ⅱ) more extraction method, because the method of low value, interference is small, but the operation is complicated. The direct determination of manganese (Ⅱ) in aqueous solution has the disadvantage of high blank value and large interference. The authors studied the oxidation of manganese (II) to permanganate with sodium bismuthate, which is poorly water-soluble, adding iodine after excess sodium bismuthate was removed, and the trace manganese was quantified by measuring the absorbance of the resulting iodine. This method has high sensitivity compared with the widely used permanganate method and formaldehyde oxime method, and has little interference on the determination of zinc (Ⅱ), nickel (Ⅱ), lead (Ⅱ), cadmium (Ⅱ)