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| 高氯低COD值水样的无汞快速测定法 |
| Study on Rapid Mercury free Determination of High chlorine Low COD Water Samples |
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| DOI： |
| 中文关键词: COD 高氯水样 滴定法 快速测定 |
| 英文关键词: COD High chlorine water samples Titration method Rapid determination |
| 基金项目: |
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| 中文摘要: |
| 以硝酸银和硫酸铬钾代替硫酸汞来消除COD测定中的氯离子干扰,同时将重铬酸钾溶液的浓度降低为0.100 mol/L，并用硫磷混酸代替硫酸，该方法经过对标准样品和实际样品的测定，表现出对于测定氯离子含量低于 25 000 mg/L的高氯低COD 值水样具有较好的准确度和精密度，同时可以实现银盐的回收再利用。 |
| 英文摘要: |
| AgNO3 and CrK(SO4)2·12H2O was used instead of HgSO4 for elimination of chloride ion interference in the determination of COD. Meanwhile, the concentration of potassium dichromate was reduced to 0.100 mol/L. A mixture of sulphuric acid and phosphor acid was used instead of sulfuric acid. The determination of standard samples and examination of actual samples showed that this method had a good accuracy and precision for determination of low COD water samples containing chloride ion below 25 000 mg/L, and the silver recycling could also be achieved. |
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