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在汞的测定方法中,普遍采用的双硫腙萃取比色法杂质干扰影响很大,常使结果偏高;曝气富集—双硫腙萃取比色法杂质干扰小,灵敏度高(可达1微克/升),但操作繁琐、费时,不适宜成批水样的快速测定。M.S.Cresser和Reginald O.Arah and Bruce Mcduffie报道了紫外分光光度法测定汞,但他们的方法不能直接用于复杂的含汞工业废水分析。本工作采用双硫腙—四氯化碳溶液萃取和盐酸反萃将紫外分光光度法应用于较复杂的含汞工业废水分析。对氯碱工厂含汞淡盐水和含汞电镀废水中的汞含量进行了测定,与曝气富集—双硫腙萃取比色法的测定结果一致。
In the determination of mercury, the commonly used dithizone extraction colorimetric impurities interfere greatly, often result in high; aeration enrichment - Dithizone extraction colorimetric impurity interference, high sensitivity (up to 1 microgram / liter), but cumbersome operation, time-consuming, not suitable for rapid determination of bulk water samples. M.S. Cresser and Reginald O. Arah and Bruce Mcduffie reported the determination of mercury by UV spectrophotometry, but their method can not be used directly for complex mercury-containing industrial wastewater analysis. This work using dithizone - carbon tetrachloride solution extraction and hydrochloric acid back-extraction UV spectrophotometry for more complex mercury-containing industrial wastewater analysis. The content of mercury in the mercury-containing and light-salt wastewater containing mercury and the mercury in electroplating wastewater containing mercury was measured, which was in good agreement with the results of the colorimetric determination by the method of aeration enrichment-dithizone extraction.