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研究了硫酸-二苯羟乙酸-氯酸钾-CTMAB体系中钨的极谱催化性质.证实了该极谱波是吸附催化波.发现了CTMAB能改善波形,增加灵敏度,同时能消除较大量钼的干扰。利用CHCl_3萃取钨与氯化6,7-二羟基-2,4-二苯基苯并吡喃的络合物,以浓缩海水中超痕量的钨,然后用催化极谱法测定.水中钨的测定灵敏度为5×10~(-11)M.方法选择性好,简便、快速.除能测定海水外,还可用于测定江水、湖水、温泉水以及自来水等,均取得了满意的结果.
The polarographic catalytic properties of tungsten in sulfuric acid-diphenylacetic acid-potassium chlorate-CTMAB system were investigated, and it was confirmed that the polarographic wave was an adsorptive catalytic wave. It was found that CTMAB can improve the waveform, increase the sensitivity and eliminate the interference of larger amount of molybdenum . The complex of tungsten with 6,7-dihydroxy-2,4-diphenylbenzopyran chloride was extracted with CHCl 3 to concentrate ultra-trace amounts of tungsten in seawater and then determined by catalytic polarography. The sensitivity of the method is 5 × 10 ~ (-11) M. The method has good selectivity, simplicity and speed, and can be used to determine river water, lake water, hot spring water and tap water in addition to measuring seawater, and satisfactory results have been obtained.