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使用过氯乙烯纤维滤膜采集空气中浮游尘,利用X线衍射直接测定法进行游离二氧化硅含量的测定。该法的灵敏度为10微克,石英标准曲线从10微克至10毫克范围呈良好的线性关系,准确度为±15％。该法测定结果基本与焦磷酸法一致。本文对影响测定的有关因素进行了初步探讨。
Chlorofluorocarbon fiber membrane was used to collect the floating dust in the air, and the free silica content was determined by X-ray diffractometry. The sensitivity of this method is 10 micrograms, and the standard curve of quartz has a good linear relationship from 10 micrograms to 10 micrograms with an accuracy of ± 15%. The determination of the results of the basic pyrophosphate method consistent. In this paper, the impact of the determination of the relevant factors were discussed.