AWWA WQTC60645

This slide presentation outlines information on methods of measuring perchlorate at sub ppb levels. Topics covered include: accuracy at the sub-ppb level; analytical options for ClO₄ at this concentration range; principles of Methods 314, 314.1, 330.0, and 331; comparison of these methods; 3 issues of measuring at this level; Massachusetts demonstration of capability; Massachusetts batch QC criteria for sub-ppb analysis; required single blind PT studies for MA; results of single blind performance; and, performance assessment.