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《化学分析计量》 2021年第02期
DOI:10.3969/j.issn.1008-6145.2021.02.003
TMB-PA-DMA 目视比色法测定水中余氯
娄红杰,刘威,胡艳晶,张冠楠,吴弘基,张学峰
神华榆林能源化工有限公司,陕西神木 719300 
Determination of residual chlorine in water by TMB-PA-DMA visual colorimetry
Lou Hongjie, Liu Wei, Hu Yanjing, Zhang Guannan, Wu Hongji, Zhang Xuefeng
ShenhuaYulin Energy Chemical Co., Ltd., Shenmu 719300, China 
摘要:建立TMB(3,3',5,5'-四甲基联苯胺)-PA(磷酸)-DMA(N,N-二甲基乙酰胺)目视比色法现场测定水中余氯的方法。在国标法TMB 目视比色法基础上,将TMB 显色剂中盐酸浓度由0.10 mol/L 提高至0.50 mol/L ;加入DMA 加速溶解TMB 并防止TMB 析出;加入PA 消除铁的干扰并缓冲溶液的pH 值。在0.50 mol/L 盐酸溶液下,通过正交试验,确定TMB、PA、DMA 最优组合:TMB 为0.30 g/L,PA 为1.00 mol/L,DMA 为0.50%(体积分数)。结果表明:加入DMA 后TMB 溶解时间由约5 h 缩短至30 s ;加入PA 消除铁干扰效果明显;水样无需事先用酸调节pH 值,直接加入显色剂即可比色定量。用TMB-PA-DMA 法测定水样中余氯,测定结果的相对标准偏差不大于3.7%(n=7)。分别用TMB-PA-DMA 目视比色法和DPD 分光法测定水样中余氯,二者的测定结果无显著差异。该方法简便高效,快速、准确,更适宜现场测定水中余氯。 
Abstract:A method of on-site determination of residual chlorine in water samples by TMB(3, 3', 5, 5'-tetramethylbenzidine)-PA(phosphoric acid)-DMA (N, N-dimethylacetamide) visual colorimetry was established. Based on the national standard method of TMB visual colorimetry, the concentration of hydrochloric acid in TMB chromogenic agent was increased from 0.10 to 0.50 mol/L; adding DMA can accelerate the dissolution of TMB and prevent TMB precipitation; adding PA can eliminate interference of iron and buffer the pH value of solution. Under 0.50 mol/L hydrochloric acid, the optimal combination of TMB, PA, DMA was determined as followed: 0.30 g/L TMB, 1.00 mol/L PA, 0.50% DMA. TMB was rapidly dissolved from 5 h to 30 s under DMA assisted solution; PA had obvious effect on eliminating iron interference; the water sample could be colorimetric and quantitative without adjusting pH value with acid in advance. TMB-PA-DMA visual colorimetry was used to determine residual chlorine in water samples, and the relative standard deviation was not more than 3.7%(n=7). There was no significant difference between TMB-PA-DMA visual colorimetry and DPD spectrophotometry for determination of residual chlorine in water samples. The method is simple, efficient, rapid and accurate, wich is more suitable for on-site determination of residual chlorine in water. 
关键词:TMB;PA;DMA;目视比色法;余氯 
Keywords:3, 3', 5, 5'-tetramethylbenzidine; phosphoric acid; N, N-dimethylacetamide; visual colorimetry; residual chlorine 
基金:国家能源集团中国神华煤制油化工有限公司科技创新项目资助(MZYHG-2020-12) 
本文引用格式:
娄红杰,刘威,胡艳晶,等. TMB-PA-DMA 目视比色法测定水中余氯[J]. 化学分析计量,2021,30(2):11.
Lou Hongjie,Liu Wei,Hu Yanjing,et al. Determination of residual chlorine in water by TMB-PA-DMA visual colorimetry[J]. Chemical Analysis and Meterage,2021,30(2):11. 

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