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。
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 Iow concentration water by GB 11914. This is to analyze the impact of concentration gradient on CQDor. 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.
出处
《山东科学》
CAS
2013年第1期97-101,共5页
Shandong Science
基金
山东省分析测试中心科技发展基金
