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A one-way ANOVA demonstrated that there was a significant influence by the initial preloading concentration of any type of DOM on the BAF values of 2 PAHs (p??0.05). In MWNT-DOM(C)�Camended sediment, a continuous decrease of BSAF values for PAHs was found when both DOM concentrations increased except that the unusual high values appeared in MWNT-FA20(C) amended sediment (Figure 2). For example, the reduction of BSAF values of pyrene induced by 20?mg/L, 50?mg/L, and 100?mg/L tannic http://www.selleck.cn/products/mi-773-sar405838.html acid were 26%, 40%, and 54%, respectively. Similar to the MWNT-DOM(L) amended sediment, the BAF values of two PAHs decreased with increasing DOM concentrations (Figure 3). An ANOVA demonstrated that there http://www.selleckchem.com/products/Imatinib-Mesylate.html was a significant difference of impacts of DOM type when coexisting with MWNT, on BAF values of pyrene (p??0.05); however, the coexisting amount of both fulvic acid and tannic acid had a significant impact on BAF values of both PAHs (p? http://www.selleckchem.com/products/VX-770.html is often regarded as an indicator of the bioavailable concentration of HOCs to the aquatic or sediment organisms [21, 27]. However, the last route, which is dominated by the probability of ingesting particle-associated HOCs, is often not considered in research. In the present study, the test organism C. plumosus larvae are filter-feeding benthic organisms, which make them accumulate HOCs not only through respiration and skin absorption, but also through particle ingestion [21, 28, 29]. The bioaccumulation results showed that, regardless of the presence or absence of the preloaded- or coexisting DOM, the amendment of 1% MWNT in sediments led to the decrease of BSAF values, but to an elevation of log BAF values of PAHs. Notably, Petersen et al. observed that some MWNTs combined with sediment or soil could be ingested into guts of Lumbriculus variegatus and Eisenia foetida, but the ingested MWNTs could not be absorbed into tissues [30, 31]. In the present study, the presence of MWNTs greatly reduced the freely dissolved concentration of PAHs in porewater and suppressed the exposure through skin absorption and respiration, leading to the decrease of BSAF values.