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电位滴定法测定锰矿中的锰,国内已有许多单位应用于例行分析,多采用晶体管差动放大电路,以铂—银为电极,用0—50微安表指示终点,我们在72年向桂林冶金地质研究所学习了这个方法,首先用一级差动放大电路。为了增大放大倍数,提高指示终点的灵敏度,最近我们安装了具有恒流源的两级差动放大电路,放大倍数约为200倍,其两级差动放大都用BG304差分对管,保证其对称性
Potentiometric titration of manganese in manganese ore, many units have been used in routine analysis, the use of transistor differential amplifier circuit to platinum - silver as the electrode, with 0-50 microampere meter indicates the end point, we in 72 years to Guilin Institute of Metallurgy and Geology learned this method, first of all with a differential amplifier circuit. In order to increase the magnification, increase the sensitivity of the end of the instruction, we recently installed a two-stage differential amplifier with a constant current source, magnification of about 200 times its two differential amplification are used BG304 differential pair to ensure that its symmetry