改进的重铬酸盐法测定含氯废水中化学需氧量  

Determination of Nitrate and Nitrite in Seawater by Continuous Flow Injection Analysis

作　　者：胡红美 苏诗原 郭远明 郝青 张露 金衍健 孙秀梅 顾蓓乔 HU Hong-mei SU Shi-yuan GUO Yuan-ming et al(Marine and Fishery Research Institute of Zhejiang Ocean University, Marine Fisheries Institute of Zhejiang Province, Key Laboratory of Mariculture and Enhancement of Zhejiang Province, Zhoushan 316021, China)

机构地区：[1]浙江海洋大学海洋与渔业研究所,浙江省海洋水产研究所,浙江省海水增养殖重点实验室,浙江舟山316021

出　　处：《浙江海洋学院学报（自然科学版）》2017年第3期217-222,共6页Journal of Zhejiang Ocean University(Natural Science Edition)

基　　金：浙江省科技计划项目(2016F50040;2017F50021);舟山市科技项目(2016C31055)

摘　　要：对重铬酸盐法测定含氯废水中化学需氧量的方法进行了改进,通过加入适量硝酸银溶液屏蔽氯离子的影响,比传统硫酸汞屏蔽法对氯离子掩蔽范围更广,当氯离子质量浓度小于5 000 mg/L时对测定结果无影响。改进方法检出限为5 mg/L,对模拟水样进行测定,测定结果的相对误差为-13.3%~18.8%,标准偏差为0.73~2.74 mg/L,相对标准偏(n=6)差在1.76%~4.37%之间。方法应用于实际排污口水样的测定,测定值与国标法测定值相符,测定值的相对偏差在-11.99%~9.88%之间,相对标准偏差(n=6)在2.38%~4.75%之间。A modification for method of dichromate titrimetric determination of chemical oxygen demand in wasterwater containing chlorine was proposed. As compared with the traditional method, using appropriate amount of nitric acid silver solution shielding the chloride ion in wastewater, which obtained a much broader masking effect, and it was shown that no interference was observed when mass concentration of chloride ion was under 5 000 mg/L. Detection limit of the method found was 5 mg/L. The proposed method was applied to the analysis of the simulatedwater samples, giving values of relatice errors, standard deviations and RSD ＇s（n=6） in the ranges of-13.3%-18.8%, 0.73-2.74 mg/L, 1.76%-4.37%, respectively. The proposed method was applied to the analysis of real water samples, giving results in consistency with those obtained by the GB method with values of relative deviation and RSD＇s（n=6） in the range of-11.99%-9.88% and 2.38%-4.75%, respectively.

关 键 词：重铬酸盐法 化学需氧量 含氯废水 

分 类 号：X832[环境科学与工程—环境工程]