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Method 8261: Using Surrogates to Measure Matrix Effects
and Correct Analytical Results
Michael Hiatt
National Exposure Research Laboratory, US Environmental Protection Agency,
944 East Harmon Ave., Las Vegas, NV 89119
702-798-2381
hiatt.mike@epamail.epa.gov
Paper published in the Proceedings of WTQA '99
(15th Annual Waste Testing & Quality Assurance Symposium), p. 188.
This
paper reports use of a vacuum distillation method to determine volatile
organic compounds in difficult matrices incorporating a novel approach to
optimizing QA requirements. The resultant method (SW-846 Method 8261,
Update IVB) uses surrogate compounds representing the range of chemical
properties of the method's analytes in order to measure matrix effects and
to compensate for their biases. Method 8261 eliminates the need for matrix
spike/matrix spike duplicates as well as calibration of instrumentation by
matrix type. This paper presents the theory behind the surrogate
corrections incorporated within the method.
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