电感耦合等离子体质谱中有机试剂的基体效应研究

Matrix Effects in Inductively Coupled Plasma Mass Spectrometry by Use of Organic Solvents

研究了乙醇、丙醇、丙三醇、乙酸、乙二胺和三乙醇胺等与水互溶的有机试剂对不同质量和电离电位元素质谱信号的影响。在优化的工作条件下 ,溶液中加入少量的乙醇、丙醇、丙三醇、乙酸、乙二胺或三乙醇胺对电离能在 9～ 1 1eV的元素的信号有不同程度的增强 ,附加乙二胺或三乙醇胺对Hg信号的增强效应显著大于乙醇、丙醇和丙三醇等试剂 ;探讨了乙二胺和三乙醇胺对Hg的信号增强机理。利用乙二胺或三乙醇胺对Hg的信号增强的特性 ,测定了生物样品的Hg。方法简便快速。

Matrix effects arising from ethanol,propanol,glycerol, acetic acid,ethylenediamine and triethanolamine in inductively coupled plasma mass spectrometry have been studied.Addition of ethanol, propanol,glycerol, acetic acid,ethylenediamine and triethanolamine into solution has an enhancement effect on the signal intensity of analyte with ionization potential between 9 and 11 eV.The ethylenediamine and triethanolamine have higher enhancement effect on the signal intensity of Hg than that of ethanol, propanol, glycerol and acetic acid.Addition of ethylenediamine and triethanolamine into solution has a suppression effect on the signal intensity of Pb and Sr.The mechanism of the enhancement or suppression was investigated.The signal enhancement of Hg in the presence of ethylenediamine and triethanolamine is not caused by improved degree of ionization of Hg and nebulization efficiency.The suppression effects of Pb and Sr in the presence of ethylenediamine and triethanolamine are due to decrease of atomization efficiency of these elements.A method for the determination of Hg in the biological standard samples by ICP MS was developed.