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| Research on the Experimental Principle and Influencing Factors of Determining Water-soluble Chromium (VI) in Cement |
| Shandong Provincial Institute of Product Quality Inspection, Jinan Shandong 250022, China |
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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).
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Received: 28 May 2024
Published: 25 January 2025
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