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And for each method, a blank sample (solvent plus I.S).
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For each batch of 10 samples, 3 method blanks—a spiked blank and a pair of matrix-spiked samples (spiked with 100 ng each of target phthalates) per duplicate were processed.
For each batch of 60 samples, four method blanks, a spiked blank, and a pair of matrix-spiked sample/duplicates were processed.
Quality control was monitored using method blanks, PUF blanks, field blanks, lab matrix spikes for all congeners, and surrogate spikes.
Sample batches consisted of 35 to 37 field samples, one SRM (NIST 2583), a method blank, a duplicate, and a duplicate spiked sample (spiked to give 2.5 μg/L in the extract for all analytes except zinc, which was spiked to give 25 μg/L); in addition, three digested samples were analyzed in duplicate and then spiked and reanalyzed.
Every extraction batch consisted of a method blank, six unknown samples and either a method control or unknown duplicate sample.
Each analytical run, which was blinded to the analyst, consisted of the unknown serum samples, a method blank (quality control), an ongoing precision and recovery sample (quality control), two solvent blanks, and two calibration standard solutions.
In addition, for these data we were able to apply a method blank approximation of aluminium contamination of the methods which was based upon 120 method blanks [ 5].
Sample batches consisted of 15 field samples plus three quality control (QC) samples: a lab duplicate, a solvent method blank, and a duplicate spiked sample (spiked with either 50 ng or 250 ng) or solvent spiked sample (100 ng/analyte).
Both a vehicle control (VC) and "sham" control (SC), also called a "method blank", were run in triplicate or quadruplicate in each experiment.
The optimum extraction method was tested with a blank feed and egg sample and a blank feed and egg sample spiked with the different coccidiostats at their MLs or MRLs, respectively.
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