| 重铬酸盐浓度对低浓度水样中化学需氧量测定的影响 |
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| 引用本文： | 韩术鑫,王利红,薛富民,马虹,高平.重铬酸盐浓度对低浓度水样中化学需氧量测定的影响[J].山东科学,2013,26(1):97-101. |
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| 作者姓名： | 韩术鑫 王利红 薛富民 马虹 高平 |
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| 作者单位： | 1.山东省分析测试中心，山东 济南 250014；
2. 山东省地质环境监测总站，山东 济南 250014 |
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| 基金项目： | 山东省分析测试中心科技发展基金 |
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| 摘 要： | 针对GB 11914对低浓度水样测定化学需氧量（CODCr）准确度差的问题，采用不同浓度的重铬酸盐法对山东省内不同地区的低浓度水样进行测定比较，以此分析浓度梯度对CODCr的影响程度。结果表明，CODCr随着重铬酸盐浓度的增加而增大。空白水的质量、滴定终点的判定等对测定结果产生重要影响。建议分析低浓度水样的CODCr时全面收集水样的相关信息，并充分权衡方法的系统误差、氧化能力和检测范围，采用适宜浓度的重铬酸盐法，以提高检测数据的准确度。
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| 关 键 词： | 重铬酸盐浓度 低浓度水样 化学需氧量 |
| 收稿时间： | 2012-05-07 |
Impact of dichromate concentration on the determination of CODCr in low concentration water |
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| HAN Shu-xin
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WANG Li-hong
,
XUE Fu-min
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MA Hong
,
GAO Ping.Impact of dichromate concentration on the determination of CODCr in low concentration water[J].Shandong Science,2013,26(1):97-101. |
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| Authors: | HAN Shu-xin WANG Li-hong XUE Fu-min MA Hong GAO Ping |
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| Institution: | 1.Shandong Analysis and Test Center, Jinan 250014,China；
2. Shandong Geological Environmental Monitoring Station, Jinan 250014,China |
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| Abstract: | We employed different concentrations of dichromate to determine low concentration water from different areas of Shandong Province for the bad precision of the determination of CODCr with low concentration water by GB 11914. This is to analyze the impact of concentration gradient on CODCr. Results indicate that CODCr increases with the increase of dichromate concentration. Determination result is significantly affected by quality of blank water, determination of end points, etc. We should completely collect the relative information about water samples when analyzing low concentration water. We should also fully consider system errors, oxidizability and detection range and choose suitable dichromate concentration in order to improve the accuracy of data detection. |
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| Keywords: | dichromate concentration low-concentration water CODCr |
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