用标准加入法测出氧化铕基准中的微量杂质元素，消除了由于忽略基准中的杂质元素的含量给分析测定带来的误差。
Determining trace impurity element of the standard europium oxide by the standard addition method. So the errors owing to neglecting the impurity in the standard are eliminated.
它含有高浓度的杂质和不安全的各级微量元素。
It contained high levels of impurities and unsafe levels of trace elements.
探讨了施主杂质、受主杂质等微量元素及玻璃料对PT C陶瓷性能的影响。
Effects of donors, acceptors, and other trace elements and the frit on properties of the PTC ceramics are discussed.
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