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电导法定硫的理想吸收液是通入等量的SO_2气体能生成最多离子的氧化剂.下面比较几种氧化剂吸收SO_2后的反应方程式。一重铬酸钾吸收液: 3SO_2+Cr_2O_7~(2-)+2H~+=2Cr~(3+)+3SO_4~(2-)+H_2O通入三个摩尔的SO_2气体,离子浓度和离子所带电荷总数增加均不多,而且还消耗掉二个摩尔[H~+],因此用它作硫的吸收液,电导值的变化率小,灵敏度低。二过氧化氢吸收液 SO_2+H_2O+H_2O_2=2H~++SO_4~(2-)+H_2O通入一个摩尔的SO_2气体能增加二个摩尔的[H~+]
The ideal absorption solution of the conductivity of the sulfur is through the same amount of SO 2 gas can generate the most ions of oxidants below several oxidant absorption SO 2 reaction equation. A potassium dichromate absorption solution: 3SO_2 + Cr_2O_7 ~ (2 -) + 2H ~ + = 2Cr ~ (3 +) + 3SO_4 ~ (2 -) + H_2O into the three molar SO_2 gas, ion concentration and ions The increase in the total charge is not much, but also consume two moles [H ~ +], so use it as a sulfur absorption solution, the conductivity value of the rate of change is small, low sensitivity. Hydrogen peroxide absorption solution SO_2 + H_2O + H_2O_2 = 2H ~ ++ SO_4 ~ (2 -) + H_2O can increase two moles of [H ~ +]