微波消解ICP-MS法同时测定大气颗粒物中多种痕量元素

采用微波消解电感耦合等离子体质谱法同时测定大气颗粒物中13种元素,选择硝酸体系消解20 min,硝酸加入体积为8 mL。Cu、Ni、Cr、Pb、Al、Mg、Mn、Ca在0μg/L～100μg/L,Ag、Ba、Co、Cd、Sn在0μg/L～5.00μg/L范围内线性良好,除Al、Mg、Ca检出限较高外,其他10种元素的检出限为0.07 ng/m3～1.82 ng/m3(按采样体积0.688 m3、定容体积50 mL计),滤膜样品平行测定3次的RSD≤1.2%,加标回收率在92%～108%之间。

Simultaneous Determination of Trace Elements in Atmospheric Particulates by ICP-MS with Microwave Digestion

13 kinds of elements concentrations in atmospheric particulates were determined by inductively coupled plasma mass spectrometry with microwave digestion. Nitric acid digestion system was taken to digest sample 20 minutes, and 8 mL nitric acid was added. The calibration curves showed a good linearity from 0 μg/L to 100μg/L for Cu, Ni, Cr, Pb, Al, Mg, Mn and Ca, and from 0 μg/L to 5.00 μg/L for Ag, Ba, Co, Cd and Sn. The detection limits of the elements ranged from 0.07 ng/m3 to 1.82 ng/m3 except A1, Mg, and Ca had higher detection limits （ air sampling volume 0. 688 m3 , formulated into a volume 50 mL）. Membrane samples were analyzed by duplicated tests three times, giving value of RSD ≤ 1.2%. Spiked recoveries ranged from 92% to 108%.