【摘要】 针对目前最常用的液-液萃取、ICP-MS测定法检测表生水体中微量稀土元素方法,研究了不同pH值条件下,酸性膦(65%HDEHP和35%H2MEHP)自表生水体中萃取稀土元素(REEs)的回收率。结果表明,在pH1~4的范围内,不同性质的水体(湖泊、河流、地下水)有不同的REEs回收率。其中湖水在pH 1.8~3.7有90%以上的回收率,最高回收率为93.64%;河水在pH 2.1~3.5范围内有90%以上的回收率,最高回收率为95.52%;地下水仅在pH 1.3~1.5时回收率超过90%,最高回收率为97.61%。说明在萃取不同表生水体中稀土元素时,需要调到特定的pH值才能得到最好的萃取效果。更多还原

【Abstract】 The method for the analysis of dissolved rare earth elements(REEs) by inductively coupled plasma mass spectrometry(ICP-MS) in surface waters after preconcenration with solvent extraction and back-extraction has been used widely.Extraction efficiency of REEs from surface waters by the mixture of 65% HDEHP and 35% H2MEHP was studied under different pH condition.The result shows that the recoveries of REEs are very different for different surface waters(lakes,rivers,and groundwater) in the range of pH from 1 to 4,with the main values 60%～90%.The highest recovery of lake water is 93.64% at pH about 1.6;the highest recovery of river water is 95.52% at pH about 3.0;the highest recovery of groundwater is 97.61% at pH about 1.4.It is concluded that different pH are needed when extraction REEs from different surface waters for getting best recovery.更多还原