比较测试了实验室配制的硒溶液和茶叶消解液，发现在测定茶叶中硒含量时，基质效应明显。采用碰撞池技术（CCT）可以消除这些基质效应，本文以铑为内标，在优化用于测定的硒同位素基础上，对CCT气体（7%氢气+93%氦气）流量也进行了优化，得出以78Se为测定同位素，CCT气体流量为5.0 mL/min的条件下，对茶叶、菠菜和大米3种国家标准物质中硒含量的测定的回收率介于91%～98%之间，准确度符合要求，说明该方法可以用于这3类农产品中硒含量的测定。%Compare the Se solution to tea digestion solution, there was obvious matrix effects in the tea diges-tion solution. As known the collided cell technology(CCT) is a commendable method for eliminating this matrix effect. In this article we used Rh as an internal standard, based the optimized isotope of selenium for test, the flow of CCT gas(7%H2+93%He) was optimized either. The results were that under the flow of gas 5.0 mL/min, determination of isotope 78Se as total selenium in the national reference substances of tea, spinach and rice, the recoveries of selenium were between 91%and 98%, the accuracy were met the demands.
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