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| ICP-MS法测定地下水中痕量元素的条件选择 |
| Conditions for Trace Element Determination in Groundwater by ICP MS |
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| DOI： |
| 中文关键词: 痕量元素 电感耦合等离子体质谱法 碰撞模式 内标法 地下水 |
| 英文关键词: Trace elements ICP MS Collision mode Internal standard method Groundwater |
| 基金项目:自然资源部地质大调查基金资助项目（DD20179303） |
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| 中文摘要: |
| 采用氦气碰撞模式和内标法抑制ICP-MS测试地下水中痕量元素的多原子离子干扰和基体效应。探讨He流量、内标元素、宏量离子等因素对测定的影响，结果表明：187Re、208Pb响应值与He流量呈线性下降模型，其他离子为指数下降模型，He流量为2.5 mL/min~3.0 mL/min时满足地下水质量分级测定要求；内标元素的响应因子随质量浓度的增大而降低，16.0 μg/L以上时趋于稳定；酸度显著影响测定误差，选用较大质量数的内标元素和保持样品酸度的一致可提高测定的准确度。 |
| 英文摘要: |
| In this paper, Helium collision mode and internal standard method were used to reduce the interferences of isobaric polyatomic ion and matrix effect in the determination of trace elements in groundwater by ICP MS. The influences of Helium flow, internal standard elements and macro ions were discussed. The results showed that the response value of 187Re, 208Pb and Helium flow were in a linear decrease, while other ions were in exponential fall. When Helium flow was in 2.5 mL/min~3.0 mL/min, the method could be applied for groundwater quality classification determination. The response factors of the internal standard elements decreased with the increase of ion concentration, and the response factors tended to be stable when the ion concentration exceeded 16.0 μg/L. Acidity significantly affected the determination error. Selecting the internal standard elements of larger mass and keeping consistent in sample acidity would improve the accuracy of the measurement. |
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