trace impurity 痕量杂质
trace impurity yttrium 痕量杂质钇
detection of trace impurity 痕量检测
determination of trace impurity 痕量杂质
trace of impurity 痕量杂质
impurity trace 径迹污染
trace gas impurity analysis 痕量气体杂质分析
The trace phenol and impurity were removed from the bisphenol A with active white soil as dephenolizer, and its rate is more than 99%.
用活性白土做脱酚剂去除双酚A中的微量苯酚及其杂质，其去除率可达99％以上。
The trace impurity in product has been determined by A A S. it is important to improve process.
还用原子吸收光谱法测定了产品中微量杂质的含量，对改进生产工艺具有指导作用。
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.
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。
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