TOX is an important collective parameter which indicates the overall formation of halogenated DBPs . The concentrations of TOX in SMPs under different conditions were shown in Fig. 4. Similar to C-DBPs and N-DBPs, TOX concentrations were higher under other stressful conditions compared with NS, except for HM condition. These results indicated that everolimus HA, HS and HT condition promoted the formation of halogenated DBPs.
Fig. 4. Total organic halogen (TOX) of SMPs under various conditions. Error bars represent the standard deviation based on triplicate analyses. (NS = normal state, HA = high ammonia content, HS = high salinity, HM = high level of heavy metal, HT = high temperature.)Figure optionsDownload full-size imageDownload as PowerPoint slide
Correlations among DOC, C-DBPs, N-DBPs, DON and TOX were examined using Pearson’s correlation test. There were statistically significant correlations between DOC and C-DBPs, between DOC and TOX, and between TOX and C-DBPs (P < 0.05), implying niche the amount of C-DBPs and TOX could be predicted by the levels of DOC in SMPs. The amount of C-DBPs could also be predicted by TOX in SMPs. There was however, no significant correlation between DON and N-DBPs (P > 0.05). This finding is similar to that of a previous report , in which no correlation between DON and N-DBPs was observed.