of standard purity

The purity of magnesium chloride hexahydrate was over 46% and the quality of the main component accorded with the requirements of national standard, GB 8453-87. The recovery of magnesia was over 74% in this step.

此条件下产品六水氯化镁纯度可达46%以上，主组分含量达到工业氯化镁标准GB8453-87的要求；氧化镁一步回收率可达74%以上。

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In order to ensure the supply of standard material for chemistry production and apparatus, we did the research of high purity neon gas standard material.

随着我国工业的发展，对氖气产品质量提出了更高要求，为了保证化工生产和仪器仪表服务所需要的标准物质，我们研制了高纯氖气体标准物质。

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Results The UV and HPLC spectrum of the synthesized 3 H higenamine were identical with that of the higenamine standard, the radiochemical purity was more than 98% and the specific activity was 370 GBq/ mmol.

结果合成的3H去甲乌药碱UV和HPLC图谱鉴定与去甲乌药碱标准品一致，放化纯>98%，比活度>370GBq mmol。

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By using reaction distillation, and additive cc 601, the purity of naphthalene can be more than 99.6%, reaching the first grade pure naphthalene national standard.

采用反应精馏，加入cc－601添加剂，可得到纯度大于99.6%的精萘，符合国家一级精萘标准。

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A gas chromatographic method for the determination of dimethyl carbonate ( DMC) purity and its impurities has been developed with HP-Wax polar capillary column and thermal conductivity detector. Cyclopentanol was used as an internal standard.

提出用HP-Wax强极性毛细管柱分离，热导检测器检测，以环戊醇作内标定量，同时测定碳酸二甲酯纯度及其杂质。

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