射线衍射分析表明，产品中无水硫酸钙相的含量为97.0%。
The results analyzed by X-ray show that the content of anhydrous calcium sulfate is 97.0% by weight.
用无水硫酸钠吸干米饭中水份，再以乙酸乙脂提取样品中甲胺磷，提取液直接进气相色谱仪测定。
This method is applicable to rapidly determine Methamidophos with GC. Methamidophos in rice is extracted with ethyl acetate to prepare sample solution that dries with sodium sulfate.
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