电热消解-电感耦合等离子体质谱(ICP-MS)法测定土壤中镱铪钽钨四种高能稀土元素

镱(172 Yb)、铪(178 Hf)、钽(181 Ta)、钨(182 W)四种稀土元素质量数均高于170,第一电离能分别为601、656、759、767 kJ/mol,高于平均电离能486 kJ/mol,属于难电离元素,且在土壤中含量较低。通过选择合适的消解体系,采用碰撞模式去除多原子离子干扰,选择193 Ir内标校正基体干扰,建立了电热消解-电感耦合等离子体质谱法测定土壤中镱铪钽钨四种高能稀土元素的方法。4种元素校准曲线的线性均大于0.999,检出限在0.05~0.5μg/g,用土壤标准物质GSS-8、GSS-13进行验证,平均相对标准偏差(RSD)在3.2%~12.4%,加标回收率为88%~115%,各元素的测定值与标准值吻合。

Determination of four high energy rare earth elements in environmental soil by Inductively Coupled Plasma Mass Spectrometry with electrothermal digestion

The mass numbers of ytterbium,hafnium,tantalum and tungsten are all higher than 170,The first ionization energy is 601,656,759,767 kJ/mol,which is higher than the average ionization energy of 486 kJ/mol,belonging to the difficult ionization element,and the content in the soil is relatively low.In this paper,by choosing a suitable digestion system,using collision mode to diminish polyatomic ion interference,choosing 193 Ir internal standard to correct matrix interference,establish the method of four high energy rare earth elements in environmental soil by inductively coupled plasma mass spectrometry with electrothermal digestion.The calibration curve r>0.999,the detection limit of the method between 0.05-0.5μg/g.Using the new method to analysis the national standard soil samples of GSS-8、GSS-13,the average RSD between 3.2%-12.4%,the recovery rate was 88%-115%,determination of the value of each element is consistent with the standard value.