Methods: the standard method for determining the sensibility of insecticides recommended by WHO.
方法采用WHO推荐的测定杀虫剂敏感性的标准方法。
ObjectiveTo improve the standard method for determining phosphoric acid in the air of workplace, so as to make it to be applied in practical work.
目的对目前工作场所空气中磷酸的标准测定方法进行改进，使之可以在实际工作中应用。
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。
应用推荐