Fig. 1. The mean trapping efficiency for atrazine (ATR), diaminoatrazine (DA), deisopropylatrazine (DIA), desethylatrazine (DEA), and hydroxyatrazine (HA) during the 60-min run-on simulation. Values presented for each compound are the mean of eight replications. Compounds followed by the same letter are not significantly different at P 0.06.