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锌在示波极谱图上具有敏锐的切口,在pH为2~3的HCl-NaCl介质中,可用EDTA直接滴定铝。当滴加EDTA至切口消失时,即达到滴定终点。对红树植物体中铝的分析结果表明:此方法具有直观、操作简便、分析快速的优点,回收率相对误差在10%左右。几种红树体的不同部分铝的质量分数(干重计)分别是:叶为(6.69~29.9)×10~(-3),树干为(1.91~26.8)×10~(-3),常年生树枝为(5.54~29.8)×10~(-3). 相似文献
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In this paper, the polarographic catalytic wave of trace chromium in seawater and its mechanism are studied. In supporting electrolyte containing ethylene diamine-NaNO2-EDTA, a clear, sensitive and stable catalytic wave is obtained, and its largest peak potential in differential oscilloscopic pola-rogram is -1.7 V (S.C.E). The detection limit for Cr is 1.5 × 10-9 M. It is unnecessary for natural seawater samples to be separated and preconcentrated, and the samples can be directly detected. Variable coefficient is 5%, and the relative error of recovery efficiency, 10%. The wave is a kind of hydrogen catalytic one with absorbability. 相似文献
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Tungsten and molybdenum in seawater can be sensitively and accurately determined by the polaro-graphic catalytic wave. In a supporting electrolyte containing HCl-benzilic acid-Nad, tungsten has a clear and stable catalytic wave. Then, the peak current of molybdenum increases as KClO3 is added into the above medium. The sensitivity of the proposed method is 5×10-2 M for W and 6×10-10 M for Mo, respectively.This method is an extremely quick, sensitive one and is suitable for the analysis of various kinds of water. 相似文献
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本文在自行设计的多功能伏安仪基础上,开发出方波溶出伏安法的软件系统,并将该法应用于近岸海水及其它水样中痕量铜与铅的测定。其检测限分别为1μg/L,2μg/L,变 相似文献
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