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到現在为止,在文献中还沒有記載过工業上常用的分析硫酸或硝酸中六價鉻鹽溶液的滿意的方法。为了定量的测定H_2SO_4—K_2Cr_2O_7,及HNO_3—K_2Cr_2O_7系中的組分,我們利用已有的電位滴定方法,这种滴定是藉助於由过氧化氫在鉑上分解而得的電極進行的。没有副反应時,用鹼滴定重鉻酸鹽的酸性溶液可寫成下列反应: H_2SO_4+2KOH=K_2SO_4+2H_2O (1)
So far, no satisfactory method has been documented in the literature for the analysis of hexavalent chromium salts in sulfuric acid or nitric acid, which is commonly used in the industry. In order to quantitatively determine the components of the H_2SO_4-K_2Cr_2O_7 and HNO_3-K_2Cr_2O_7 systems, we have used the existing potentiometric titration method with the help of an electrode produced by the decomposition of hydrogen peroxide on platinum. In the absence of side reactions, acid dichromate acid titration can be written as the following reaction: H 2 SO 4 + 2 KOH = K 2 SO 4 + 2H 2 O (1)