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SPE recovery of standard 40 estrogen-related compounds. The 2-ml aliquots of activated charcoal-treated human urine samples were spiked with the total (a) 250, (b) 500 and (c) 1,000 pg of 40 estrogen-related compounds before and after (control) passing over phenyl SPE cartridges. The recovery of each compound was determined by comparing the experimental values to the controls.
