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显象管洗屏废水中的镉,一般小于0.1ppm,但F~-量(几百ppm)和酸度(pH 3—4)较高,故对电极直接测定有影响。本文作者介绍采用加入硼酸络合F~-的方法可消除F~-的干扰,Cd~(2+)电极测定则利用两次标准添加法。由于样品中Cd~(2+)较低,有时<10~(-7)M,故文中采用在样品内先加入一定量的Cd~(2+)标准溶液,使样品中的Cd~(2+)浓度在可测的浓度范
The amount of cadmium in the screen washing wastewater is generally less than 0.1ppm. However, the F ~ - amount (hundreds of ppm) and the acidity (pH 3-4) are high, so it has an impact on the direct electrode measurement. The authors describe the use of boric acid complexation F ~ - can eliminate the interference of F ~, Cd ~ (2 +) electrode was measured using two standard addition method. Because of the low Cd2 + in the sample and sometimes <10 ~ (-7) M, a certain amount of Cd2 + standard solution is added into the sample to make Cd2 +) Concentration at a measurable concentration range