| 摘要: |
| 研究用氯化钙和硫酸镁配制总硬度标准品的均匀性和稳定性，根据《能力验证样品均匀性和稳定性评价指南》（CNAS-GL03：2006），随机抽取样品进行检验。结果表明，4种浓度的样品在pH值＜2，室温25 ℃时，样品内和样品间均无显著性差异，样品均匀性合格，在一年内稳定性较好。 |
| 关键词: 总硬度 标准样品 均匀性 稳定性 |
| DOI： |
| 分类号:X830.5 |
| 文献标识码:B |
| 基金项目: |
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| Research of Homogeneity and Stability of Total Hardness Samples Used for Proficiency Testing |
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WANG Shuting， TIAN Weihua， LIN Kai， ZHOU Chi， DOU Beilei ，XING Yan1,2
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1. Shanxi Province Environmental Monitoring Central Station，Xi,an， Shanxi 710054，China;2. Xi,an Water Environmental Monitoring Center， Xi,an， Shanxi 710100， China
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| Abstract: |
| The homogeneity and stability of the standard samples which contain calcium chloride and magnesium sulfate for total hardness were investigated. Randomly selected samples were tested for homogeneity and stability according to the “Guidance on Evaluating the Homogeneity and Stability of Samples Used for Proficiency Testing” （CNAS-GL03：2006）. The results showed that four different concentrations of samples were stable and homogeneous in room temperature 25℃， pH<2 within a year， without significant difference in between the samples. |
| Key words: Total hardness Standard sample Homogeneity Stability |
