顺序注射氢化物发生-原子荧光光谱法同时测定环境水样中铋和汞

Determination of bismuth and mercury in environmental water samples by sequential injection hydride generation-atomic fluorescence spectrometry

建立了一种顺序注射氢化物发生-原子荧光光谱法同时测定水样中的Bi和Hg含量的方法。考察了光电倍增管负高压、铋和汞灯电流、原子化器高度、载气流量、屏蔽气流量等因素对测定结果的的影响。研究发现：载流HCl的浓度为0.3—0.6mol／L，KBH4浓度为4g／L，稳定剂K2Cr2O7浓度为5g／L时，同时测定铋和汞的效果最佳。在最佳实验条件下，铋和汞的检出限分别为0.0058μg／L和0.0075μg／L。方法用于河水、井水和池水水样中铋和汞的测定，加标回收率为91.0%—109％，相对标准偏差小于3.4％，被测水样中共存的离子对铋和汞的测定没有干扰。

A sequential injection hydride generation atomic fluorescence spectrometry was developed for simultaneous determination of bismuth and mercury in water. The effects of instrument parame- ters, such as the negative high voltage of the photomultiplier, lamp current of bismuth and mercury, rate of carrier gas and shield gas on the determination of bismuth and mercury were studied. It was discovered in the research that when the concentration of hydrochloric acid , potassium borohydride and stabilizer K2Cr2O7 was 0.3-0.6 mol/L, 4 g/L and 5 g/L respectively , the effect of determination for bismuth and hydrargyrum was the best . Under the proposed conditions, the detection limits of bismuth and mercury were 0.0058μg/L and 0.0075μg/L, respectively. In the application of this method to determine bismuth and mercury in river water, pond water and well water samples, the standard addition recoveries were between 91.0 %-109% and the RSDs were below 3.4 %. The coexistence ions in water samples almost did not interfere in the determination of bismuth and mercury.