To ensure drinking water safety, the U.S. Environmental Protection Agency (EPA) have set Maximum Contaminant Levels ( MCL) for toxic compounds in drinking water.  Five of nine haloacetic acids (HAA5), bromate, and dalapon, are regulated by the EPA with MCLs of  60 μg/L for HAA5 (total for the five compounds), 10 μg/L for bromate, and 200 μg/L for dalapon. U. S. EPA Method 557 has been validated for the determination of nine HAAs, bromate, and dalapon. The EPA method uses ion chromatography (IC) coupled with tandem mass spectrometry (IC -MS/MS). This study evaluated an IC-MS method for determination of these analytes using a single quadrupole mass spectrometer. We used an anion-exchange column that was developed after the publication of Method 557 and found that the IC-MS method was fast (40 min vs. 60 min in Method 557) and linear over the established analytical range for the 11 analytes with a r<sup>2</sup>-value range of 0.998 to 1.  The method is sensitive for the determination of U.S. EPA regulated HAA5, bromate, and dalapon with MDL ranges from 0.03 to 0.67μg/L.  The method is accurate for the determination of 10 of 11 analytes (not for tribromoacetic acid (TBAA)) in U.S. EPA Method 557 with recoveries ranging from 92% to 119% when spiked with 10 μg/L of nine HAAs, bromate, and dalapon in the Laboratory Synthetic Sample Matrix (LSSM). The method is precise with retention time precision below 0.1% and internal standard corrected peak area interday precision ranging from 0.7% to 4%.  We believe this simple IC-MS method can be used to replace IC-MS/MS for monitoring regulated HAA5, bromate, and dalapon in drinking water when an IC-MS/MS is not available.<br/>

Determination of low-level haloacetic acids, bromate, and dalapon in drinking water using IC-MS

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.