This standard specifies the method for the determination of lead by catalytic polarography. This standard applies to the determination of lead in groundwater. The minimum detection amount is 0.05ug. Its measurement range is 0.5~2000ug/L. Common coexisting ions in water do not interfere with the measurement. However, tin, arsenic, selenium, and tellurium seriously interfere with the determination. During sample processing, a certain amount of hydriodic acid can be added and evaporated to dryness 1 to 2 times to volatilize and eliminate the interference. The ionic strength in the bottom liquid cannot be too high. If it is too high, it will have a certain impact on the lead wave. For example, if the concentration of ions such as titanium, iron, aluminum, potassium, sodium, and ammonium is too high, the lead wave will be suppressed. When the calcium and sodium content When it is greater than 200 mg/L, it is not appropriate to increase the concentration rate. In this case, the standard addition method or mercapto cotton can be used to separate and enrich lead ions before measurement.
DZ/T 0064.35-1993 history
1993DZ/T 0064.35-1993 Groundwater Quality Testing Method Determination of Lead by Catalytic Polarography