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| 离子色谱法测定水中总硬度 |
| Determination of the Total Hardness in Water by Ion Chromatography |
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| DOI： |
| 中文关键词: 钙 镁 总硬度 离子色谱法 滴定法 水质 |
| 英文关键词: Calcium Magnesium Total hardness Ion chromatography Titration method Water quality |
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| 中文摘要: |
| 采用离子色谱法测定水中钙、镁离子质量浓度，并以此计算水中总硬度。方法在0 mg/L～10.0 mg/L范围内线性良好，钙、镁离子的方法检出限分别为0.02 mg/L、0.003 mg/L。该方法用于测定标准混合溶液和有证标准物质，测定结果均满足质控要求。实际水样中钙、镁离子均检出，且测定结果的RSD为0.3%~1.4%，加标回收率为91.0%～103%。用该方法与国标法同时测定实际样品，结果无明显差异。 |
| 英文摘要: |
| Total hardness in water was calculated by determining the concentration of Ca2+ and Mg2+ using ion chromatography. The calibration curve showed a good linearity from 0 mg/L to 10.0 mg/L. The detection limit of Ca2+ and Mg2+ was 0.02 mg/L and 0.003 mg/L, respectively. Test results of national standard material obtained from current method meet the requirement. Replicate analysis of samples showed that the relative standard deviation was 0.3%~1.4% and the average recovery rates were in the range of 91.0%～103%. There were no significant differences between the national method and the current method when actual water samples were determinated. |
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