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(a) Box-and-whisker plot of N-nitrosamines concentrations in biosolids samples from the U.S. EPA’s Targeted National Sewage Sludge Survey (TNSSS). Numbers within parentheses represent the number of detects out of a total of 80 samples analyzed. (b) A log–log plot of partition coefficient vs detection frequency of N-nitrosamines in biosolids showed a linear trend.
