Research on the Experimental Principle and Influencing Factors of Determining Water-soluble Chromium(Ⅵ)in Cement
JIA Yuecai
MA Li
WANG Liying
LI Hao
ZHU Yuehua
Abstract：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 water-soluble 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).
Keywords：water-soluble chromium(Ⅵ)spectrophotometerchromogenic reagentcomplexation reactionexperimental measurement
Publication Date：2025-01-24
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 75-80 )