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铬的价态不同,其毒性也不一样,因而在环境水质监测中,不仅要测定铬化合物的总含量,同时也要分别测定各种价态铬化合物的含量。溶剂萃取是采用原子吸收分光光度法最常用的预处理方法。但是它的选择性和重复性都不够好,尤其是在有机溶剂雾化燃烧时,产生刺激性的烟气,影响工作。本工作采用在酸性条件下,将水样通过D_(301)大孔阴离子交换树脂柱,六价铬被交换吸附,而和三价铬分离。再用还原性反洗液使柱上的六价铬还原溶出,并得到富集。而后,用原子吸收分光光度法直接测定流出液中的三价铬和反洗溶出液中由六价转变为三价的铬。
Different chromium valence, its toxicity is not the same, so in environmental water quality monitoring, not only to determine the total content of chromium compounds, but also to determine the price of various valence chromium compounds. Solvent extraction is the most commonly used pretreatment method using atomic absorption spectrometry. However, its selectivity and repeatability are not good enough, especially when the organic solvent is atomized and burned to produce irritating flue gas, which affects the work. In this work, the water sample was passed through a D_ (301) macroporous anion exchange resin column under acidic conditions. Hexavalent chromium was exchanged for adsorption and separated from trivalent chromium. The reduced backwash liquid was used to reduce and purify the hexavalent chromium on the column to obtain enrichment. Then, direct determination by atomic absorption spectrophotometry trivalent chromium in the effluent and backwash leachate from hexavalent to trivalent chromium.