水泥中水溶性铬(Ⅵ)的测定实验影响因素研究  

Research on the Experimental Principle and Influencing Factors of Determining Water-soluble Chromium(Ⅵ)in Cement

作　　者：贾月彩 马丽 王丽英 李皓 朱跃华 JIA Yuecai;MA Li;WANG Liying;LI Hao;ZHU Yuehua(Shandong Provincial Institute of Product Quality Inspection,Jinan Shandong 250022,China)

机构地区：[1]山东省产品质量检验研究院,山东济南250022

出　　处：《水泥技术》2025年第1期75-80,共6页Cement Technology

摘　　要：研究了水泥中水溶性铬(Ⅵ)含量检测的实验原理,采用分光光度计测量显色剂与水溶性铬(Ⅵ)在酸性溶液中的络合反应物的吸光度,可以间接测量计算出水泥样品中水溶性铬(Ⅵ)的含量。采用不同水溶性铬(Ⅵ)含量的水泥标准样品和对照样品进行实验,研究了显色剂质量、实验溶液pH值、调酸时间、显色后静置时间和实验温度等对测定结果准确性的影响。结果显示,显色剂质量不同,测定结果准确性不同;实验溶液pH值偏大,会导致测量结果产生负误差,pH值偏小对测定结果影响不大;实验溶液调酸时间应控制在30s内,显色完成后实验溶液静置时间宜在15min以上、20min以内;一定区间内的实验温度对水溶性铬(Ⅵ)测定结果影响不大。The experimental principle for detecting the content of water-soluble chromium(Ⅵ)in cement was studied.The absorbance of the complex formed by the chromogenic reagent and watersoluble chromium(Ⅵ)in an acidic solution was measured by a spectrophotometer,which could indirectly calculate the content of water-soluble chromium(Ⅵ)in cement samples.Experiments were conducted using cement standard samples and control samples with different water-soluble chromium(Ⅵ)contents to investigate the effects of chromogenic reagent mass,pH value of the experimental solution,acid adjustment time,post-coloration standing time,and experimental temperature on the accuracy of the determination results.The results showed that different masses of chromogenic reagent led to different accuracies of the determination results;a pH value that was too high in the experimental solution would cause negative errors in the measurement results,while a pH value that was too low had little effect on the determination results;the acid adjustment time of the experimental solution should be controlled within 30 seconds,and the standing time of the experimental solution after coloration should be between 15 and 20 minutes;within a certain range,the experimental temperature had little effect on the determination results of water-soluble chromium(Ⅵ).

关 键 词：水溶性铬(Ⅵ) 分光光度计 显色剂 络合反应 实验测量 

分 类 号：TQ172.18[化学工程—水泥工业]