原子荧光光度法测定地表水中重金属锑的研究

Determination of Antimony in Surface Water by Atomic Fluorescence Spectrometer

采用原子荧光光度法测定地表水中锑的含量，仪器最佳工作条件如下：灯电流为80A，辅助电流为40A，负高压为-280V，原子化器的高度为8mm，载气流量为400mL／min，屏蔽气流量为900mlMmin，进样体积为1．5mL，载流为5％盐酸溶液，还原剂为2％KBH4＋0．5％NaOH；检测前向15mL待测样品中分别加入4mL硫脲-抗坏血酸溶液和1mL盐酸，反应1．5h，将Sb还原成Sb（Ⅲ）。该方法重现性好，精密度高，检出限为0．1μg/L，水样加标回收率为97．9％-102％。

Atomic fluorescence spectrometer was applied to determine the antimony content in sur- face water. The optimal experimental conditions were as follows： lamp current of 80 A, secondary current of 40 A, negative high voltage of - 280 V, atomizer height of 8 ram, carrier gas flow rate of 400 mL/ rain, shielding gas flow rate of 900 mL/min, injection volume of 1.5 mL, carrier of 5% hydrochloric acid, and reducing agent of 2% KBH4 ＋0.5% NaOH. 4 mL of thiourea-ascorbic acid solution and 1 mL of hydrochloric acid were added to 15 mL of test sample. After reacting for 1.5 h, Sb was reduced into Sb （ Ⅲ ）. This proposed method showed good reproducibility and high precision. The detection limit was 0.1 μg/L, and the recoveries of spiked water samples were 97.9% to 102%.