USING ION CHROMATOGRAPHY TO DETECT PERCHLORATE

摘要

This article describes an ion chromatography method to analyze trace concentration of perchlorate in drinking water. Perchlorate was separated from aions commonly found in groundwater and surface water by elution through an AS5 anion exchange column with 120 mmol/L sodium hydroxide +2 mmol/L ρ-cyanophenol. Analyses were measured by conductometric detection using signals enhanced by chemical suppression of the conductance from the eluent. A 740-μL sample injection provided the sample mass necessary to achieve a perchlorate method detection limit of <=1 μg/`L and a working range of 2.5-100 μ g/L`,without sample preconcentration. Interference studies showed that 5.0μg/L of perchlorate could be measured in the presence of 1,000 mg/L of bicarbonate, chloride, or sulfate. The method was successfully used to survey drinking water wells in California considered vulnerable to perchlorate contamination.