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采用微波辅助提取-液相色谱-氢化物发生-原子荧光光谱法(LC-HG-AFS)联用技术分析了太湖沉积物中砷的形态[亚砷酸(As(III))、二甲基砷酸钠(DMA)、一甲基砷酸二钠(MMA)和砷酸As(V)]。测得沉积物中以无机砷为主,且以As(V)居多。选定以1mol/L的磷酸和0.1mol/L抗坏血酸为提取液,在微波辅助萃取(功率为60W,时间12min)下,萃取率达79.84%～91.57%,回收率在94.78%～107.6%之间。4种砷的形态在0～160μg/L之间时线性良好,检测限为0.6～2.3μg/L,相对标准偏差RSD为1.62%～2.20%。方法具有简便、快速、灵敏的特点。
Arsenic species (As (III), As (III) and As (III) in the sediments of Taihu Lake were analyzed using microwave assisted extraction-liquid chromatography- hydride generation- atomic fluorescence spectrometry (LC-HG-AFS) Sodium arsenate (DMA), monomethyl arsenate (MMA) and arsenic acid As (V)]. The main inorganic arsenic in sediment was measured, and the majority of As (V). The extraction rate was 79.84% ~ 91.57% and the recovery rate was 94.78% ~ 107.6% at 1mol / L phosphoric acid and 0.1mol / L ascorbic acid under microwave assisted extraction (power 60W, time 12min) between. The linear range of the four arsenic species was between 0 and 160 μg / L with a detection limit of 0.6-2.3 μg / L and a relative standard deviation (RSD) of 1.62% -2.20%. The method is simple, fast and sensitive.