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本文研究了用银离子催化过硫酸盐氧化亚铈盐以测定银的催化分光光度测定法.当测定波长为410毫微米时,银量由4～60微克/毫升与 D-t 直线的斜率成直线关系;若测定波长为330毫微米,斜率与银量的直线关系范围为0. 2～24微克/毫升.测定的最低浓度为0. 2微克/毫升.测定的适宜条件为:取0. 025M 硫酸亚铈盐5毫升,2N 硫酸1～7毫升和不同量银离子,以及0. 05M 过硫酸盐10. 00毫升稀释成25. 00毫升.并研究了温度及一些杂质离子对测定的影响.应用银离子催化某些反应速度以测定银的分析方法已有一些报导,银离子催化过硫酸盐氧化三价铈的反应:2Ce~3+S_2O_8~(2-)(?)2Ce~4+2SO_4~(2-)虽已证明反应速度与三价铈离子的浓度无关,与过硫酸盐浓度及银离子浓度成正比,但这反应还未见被利用.我们采用催化光度斜率法应用上述反应进行了银的测定试验,银离子最低浓度可达0. 2微克/毫升,且许多杂质离子的存在对测定影响不大.
In this paper, a catalytic spectrophotometric method for the determination of silver with silver ion catalyzed persulfate cerium oxide was developed.When the measured wavelength was 410 nm, the silver content was linearly related to the slope of Dt line from 4 to 60 μg / ml ; If the determination of the wavelength of 330 nm, the slope of the linear relationship between the amount of silver range of 0. 2 ~ 24 micrograms / ml. Determination of the minimum concentration of 0.2 micrograms per milliliter. Determination of the appropriate conditions: take 0. 025M sulfuric acid Cerium salt 5 ml, 1 ~ 7 ml of 2N sulfuric acid and different amounts of silver ions, and 0. 05M persulfate 10. 00 ml diluted to 25. 00 ml and studied the impact of temperature and some impurity ions on the determination. Silver ion catalyzes the analysis of some reaction rates to determine silver. There have been some reports that silver ions catalyze the reaction of persulfate oxidation of trivalent cerium: 2Ce ~ 3 + S_2O_8 ~ (2 -) ~ 2Ce ~ 4 + 2SO_4 ~ (2-) Although it has been demonstrated that the reaction rate is independent of the concentration of cerium ions and is proportional to the concentration of persulfate and the concentration of silver ions, the reaction has not been utilized yet.We performed the above reaction using the catalytic spectrophotometry slope method Determination of silver test, the minimum concentration of silver ions up to 0.2 g / ml, and Xu The presence of impurity ions have little effect on the measurement.