激光熔蚀-电感耦合等离子体质谱法测定底泥沉积物中的总汞

Rapid Analysis of Mercury in Sediments by Laser Ablation Inductively Coupled Plasma Mass Spectrometry

采用激光熔蚀 电感耦合等离子体质谱法 (LA ICP MS)测定了底泥沉积物中的总汞 ,沉积物样品经高压压坯后直接进行激光熔蚀测定 ,并对内标选定、样品粒度以及汞的形态等影响因素进行了研究 ,以 2个底泥标准样和 1个土壤标准样的测定结果来绘制标准曲线 ,并用于实际样品的测定 ,方法简便实用 ,测定结果与同位素稀释冷蒸气发生ICP MS法十分吻合 ,方法检出限为 0 0 2mg·kg-1,测定速度可达每小时

Laser ablation inductively coupled plasma mass spectrometry was used for the rapid analysis of mercury in sediment samples. The ground samples were simply briquetted prior to laser ablation. The effects of internal standardization, particle size and elemental speciation on the analytical performance were investigated. Direct analysis of sediment samples without internal standardization could yield satisfactory results. Elemental speciation and particle size within the studied range did not significantly affect the measurements. The calibration curve was obtained simply by analyzing one soil and two sediment reference materials. With the proposed LA-ICP-MS system, a detection limit of 0.02 mg(.)kg(-1) was achieved with a sample through put of 10 h(-1). Analytical results of sediment samples using the current system were in good agreement with those by isotope dilution hydride-generation ICP-MS.