ultra-trace impurities 痕量杂质元素
testing for trace impurities 残留物的测试
inspection of trace impurities 微量杂质测定
precipitation of trace impurities 微杂质沉淀
trace of impurities 微量杂质
trace organic impurities 微量有机杂质
Trace Rare Earth Impurities 痕量稀土杂质
The efficiency of the separation of the matrix is more than 99.9%. The recovery of standard addition of 15 trace impurities is 87—106%.
方法对于基体的分离效率达99.9%以上，痕量杂质的标准加料回收率在87—106%之间。
It contained high levels of impurities and unsafe levels of trace elements.
它含有高浓度的杂质和不安全的各级微量元素。
NF3 is a colorless gas. Trace quantities of impurities can impart a musty or pungent odor to the gas.
NF 3是无色气体。痕量的杂质会使气体带有一种霉味或刺激性气味。
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