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目的:确定微波消解罐的最佳清洗方法。方法:分别选用5种清洗方法对消解了不同样品(铬浓度分别为0.7,2.7,4,40 mg.kg-1)的消解罐进行清洗,采用微波消解以原子吸收分光光度计对清洗后消解罐中残留铬的含量进行测定。结果:“盐酸溶液(1→2)浸泡1 h,再用硝酸浸泡1 h,去离子水清洗3遍”或“用硝酸溶液(1→5)浸泡8～12 h,用去离子水清洗3遍”都可以将消解罐中残留的铬清洗干净。结论:“盐酸溶液(1→2)浸泡1 h,再用硝酸溶液(1→2)浸泡1 h,去离子水清洗3遍”的清洗方法,既可以节约时间,又可以保证后期实验结果的准确性,可用于铬测定过程中微波消解罐的清洗。
Objective: To determine the best microwave digestion tank cleaning method. Methods: Five kinds of cleaning methods were used to clean the digestion tank with different samples (chromium concentrations were 0.7, 2.7, 4 and 40 mg.kg-1, respectively). The samples were digested with microwave digestion and analyzed by atomic absorption spectrophotometer The residual chromium content in the tank was measured. Results: After soaking in hydrochloric acid solution (1 → 2) for 1 h, it was soaked in nitric acid for 1 h and deionized water for 3 times. After soaking in nitric acid solution (1 → 5) for 8-12 h, Water wash 3 times “can be digestion tank residual chromium clean. CONCLUSION: The cleaning method of ”hydrochloric acid solution (1 → 2) for 1 h, then nitric acid solution (1 → 2) for 1 h and deionized water for 3 times" can not only save time but also ensure that the later experiment The accuracy of the results can be used for the cleaning of microwave digestion tanks during the determination of chromium.