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Fig. 4. Comparison of the frequency distributions for concentrations of preemergence herbicide residues detected in California well water samples and attributed to nonpoint-source applications. (A) Simazine compared with bromacil and diuron; (B) simazine + 2-amino-4-chloro-6-ethylamino-s-triazine (ACET) + 2,4-diamino-6-chloro-s-triazine (DACT) compared with bromacil and diuron. Detection above minimum detection limits [MDLs], which range from 0.05 to 0.1 µg L-1
