ICP-MS法测定地下水中痕量元素的条件选择
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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 m L/min～3. 0 m L/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. 0μg/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。
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 ICPMS. The influences of Helium flow,internal standard elements and macro ions were discussed. The results showed that the response value of187 Re,208 Pb and Helium flow were in a linear decrease,while other ions were in exponential fall. When Helium flow was in 2. 5 m L/min ～ 3. 0 m L/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.
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 ICPMS. The influences of Helium flow,internal standard elements and macro ions were discussed. The results showed that the response value of187 Re,208 Pb and Helium flow were in a linear decrease,while other ions were in exponential fall. When Helium flow was in 2. 5 m L/min ～ 3. 0 m L/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.
引文
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[11]岳太星,李晓晶,李红莉,等.微波消解-电感耦合等离子体质谱法同时测定废水中20种元素[J].环境监测管理与技术,2012,24(4):44-47.
[12]郑奇光,崔蓉,刘盛田,等.电感耦合等离子体质谱法测定再生水补水湿地水体中Zn、Cu、As、Pb、Cd和Cr[J].中国卫生检验杂志,2017,27(14):1990-1992.
[13]卢水淼,邱明,李剑,等.六极杆碰撞反应池-ICP-MS法测定海水中痕量金属元素[J].化学分析计量,2016,25(6):13-16.
[14] YAMADA N. Kinetic energy discrimination in collision/reaction cell ICP-MS:Theoretical review of principles and limitations[J].Spectrochimica Acta Part B,2015,110:31-44.
[15]杨乐,曾静,王小燕,等. ICP-MS测定血中镁、铜、铅浓度时的基体效应单一内标校正方法研究[J].光谱学与光谱学分析,2010,30(2):518-522.
[2]许金媛,熊晓辉,吴震威,等.电感耦合等离子体质谱法测定饮用纯净水中24种金属元素[J].食品安全质量检测学报,2017,8(11):4407-4411.
[3]李冰,杨红霞.电感耦合等离子体质谱原理和应用[M].北京:地质出版社,2005.
[4]李敏,连晓文,梁旭霞,等.电感耦合等离子体质谱法测定水中低浓度铁受钙干扰的消除[J].理化检验-化学分册,2012,48(7):815-817.
[5]熊英,吴赫,王龙山.电感耦合等离子体质谱法同时测定铜铅锌矿石中微量元素镓铟铊钨钼的干扰消除[J].岩矿测试,2011,30(1):7-11.
[6] TANNER S D,BARANOV V I,BANDURA D R. Reaction cells and collision cells for ICP-MS:a tutorial review[J]. Spectrochimica Acta Part B:Atomic Spectroscopy,2002,57(9):1361-1452.
[7]程秀花,王海蓉,黎卫亮,等.电感耦合等离子体质谱法测定硒时多元素干扰的碰撞/反应研究及其在地质样品中的应用[J].冶金分析,2015,35(12):5-9.
[8] BALCAEN L,FEMANDEZ E B,RESANO M,et al. Inductively coupled plasma-tandem mass spectrometry(ICP-MS/MS):a powerful and universal tool for the interference-free determination of(ultra)trace elements:a tutorial review[J]. Analytica Chimica Acta,2015,894(2015):7-19.
[9] MAZUROVA I,KHVASCHEVSKAYA A,GUSEVA N. The choice of conditions for the determination of vanadium,chromium and arsenic concentration in waters by ICP-MS using collision mode[J]. Procedia Chemistry,2015,15(2015):201-205.
[10]赵小学,赵宗生,陈纯,等.电感耦合等离子体-质谱法内标元素选择的研究[J].中国环境监测,2016,32(1):84-87.
[11]岳太星,李晓晶,李红莉,等.微波消解-电感耦合等离子体质谱法同时测定废水中20种元素[J].环境监测管理与技术,2012,24(4):44-47.
[12]郑奇光,崔蓉,刘盛田,等.电感耦合等离子体质谱法测定再生水补水湿地水体中Zn、Cu、As、Pb、Cd和Cr[J].中国卫生检验杂志,2017,27(14):1990-1992.
[13]卢水淼,邱明,李剑,等.六极杆碰撞反应池-ICP-MS法测定海水中痕量金属元素[J].化学分析计量,2016,25(6):13-16.
[14] YAMADA N. Kinetic energy discrimination in collision/reaction cell ICP-MS:Theoretical review of principles and limitations[J].Spectrochimica Acta Part B,2015,110:31-44.
[15]杨乐,曾静,王小燕,等. ICP-MS测定血中镁、铜、铅浓度时的基体效应单一内标校正方法研究[J].光谱学与光谱学分析,2010,30(2):518-522.
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