回复hemaoyun0516发表于：2006/2/16 20:55:00悬赏金额：
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我正在学<现代环境检测技术>,有道题不知如何解答.
有一工业废水，内含有微量的汞、铜、铅和痕量酚，试设计一个预处理方案，实现四种化合物的分别测定
书上只是笼统的说用螯合剂APDC或KI螯合或络合将式样中的汞、铜、铅,再将螯合物或络合物萃取到MKBK中,直接用原子吸收光谱分析发喷雾有机物,用空气乙炔火焰中测定.具体步骤怎样,请大家指点,谢谢
还有痕量酚用GC可以吗,具体步骤怎样
zhyan 回复于：2006/2/17 14:32:00这道题的核心是前处理，我想实际操作应当是：首先分一下样品，一部分经酸消解后用石墨炉的AA分析汞，铜，铅；微量酚的测试按国标是4-AAP比色法，之前要蒸馏。
你可以看看国标生活污水的测定(cu,zn,cd,pb的测定),络合后用
原子吸收测定,是说由于其含量较低,少于50ppb,低于(或接近)火焰法的检测限,故要进行富集后测定.但国家环保局有个标准,是用石墨炉测定低浓度的,你也不妨去去看看.
至于痕量酚的测定,我只知道是用
气相色谱测定,至于测定步骤,不是很清楚,但我想环保局的标准中也会涉及的.
As to trace phenol analysis, this article may help.
Se Pu. 2001 Mar;19(2):144-6.
[Study on analysis of trace phenol in small amount of aqueous sample by liquid-liquid micro-extraction and gas chromatography]
[Article in Chinese]
Zhang AL, Zhou JT, Han M, Teng LM, Huang LP, Wang D, Wang J.
School of Environmental Science and Engineering, Dalian University of Technology, Dalian 116012, China.
A method for the liquid-liquid micro-extraction and gas chromatographic analysis of trace phenol in small amount of aqueous sample has been developed. The influences of acid and salts on recovery rate of phenol were examined. And, the influences of injection speeds and the conditions of silica wool in injection port on the quantitation precision were tested. With a direct injection port, an FID and a DB-1 capillary column of wide bore, a detection limit of 1 microgram.L-1 can be obtained employing 8 mL water sample, 160 microL ethyl acetate and 3.5 g ammonium sulfate. The added recoveries were in the range of 95.0%-98.5%. The relative standard deviations were in the range of 2.8%-3.3%. This method is simple, convenient, rapid, accurate and practical.
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