水中铋和锑的原子荧光光谱法优化研究

Study on the Optimization of Determining Bismuth and Antimony in water by Atomic Fluorescence Spectroscopy

优化并建立了同时测定水中铋和锑的原子荧光光谱法。考察了仪器负高压和灯电流、原子化器高度、载气和屏蔽气流量、介质酸度、硼氢化钾浓度等测定条件对结果的影响。通过优化确定测定条件:负高压260V、灯电流80mA、原子化器高度10mm、载气流量300mL/min、屏蔽气流量700mL/min、酸度5.0%、硼氢化钾浓度1.0%。铋和锑标准曲线在0~40μg/L内线性良好,相关系数分别为0.9997和0.9991,方法检出限分别为0.015和0.079μg/L,精密度分别为0.51%~1.96%和0.60%~2.16%,样品加标回收率分别为94.0%~98.5%和86.0%~92.0%。

The determination conditions of bismuth and antimony in water were established and optimized using atomic fluorescence spectroscopy method.The influencing factors were investigated,which included negative high voltage and lamp current,carrier gas and shielding gas flow,atomizer height,medium and acidity,potassium borohydride concentration and potassium ferricyanide concentration.The optimized conditions were as follows:negative high pressure 280V,lamp current 80mA,atomizer height 10mm,carrier gas flow 300mL/min,shielding gas flow 700ml/min,and medium hydrochloric acid,and acidity 5.0%,potassium borohydride concentration 1.0%.Under the optimized conditions,the standard curve was linear in 0~40μg/L with the correlation coefficient is 0.9997 and 0.9991,and the detection limit of 0.015 and 0.079μg/L.The precision was 0.51%~1.96%and 0.60%~2.16%,with the recovery of 94.0%~98.5%and 86.0%~92.0%.