title: Joint action of binary mixtures of cetyltrimethyl ammonium chloride and aromatic hydrocarbons on Chlorella vulgaris.
abstract: The joint action of binary mixtures of cetyltrimethyl ammonium chloride (CTAC), a cationic surfactant, and six aromatic hydrocarbons (AHs) on green algae Chlorella vulgaris was investigated. In single systems, inhibition efficiency of CTAC on the growth of algae was much higher than that of AHs (benzene, toluene, phenol, nitrobenzene, phenanthrene and fluoranthene). In combined systems, the toxicity of CTAC was enhanced by low concentrations of AHs. 96 h EC(50) value of CTAC varied from 145±13.35-56±8.27 to 56±8.27-226±8.22 μg/L when exposed to 0-1.13 and 1.13-100.84 μg/L fluoranthene, respectively. Zeta potential of algae initially increased and then decreased with the increase of fluoranthene concentration, whereas residual CTAC concentration displayed an opposite trend in the combined system. These results of this investigation showed that fluoranthene influenced the sorption of CTAC by C. vulgaris. The above results indicated that cationic surfactants and AHs have synergetic toxic effects on aquatic biota.
authors: Department of Environmental Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, PR China.
authors: Fei
authors: F
authors: Ge
authors: Yin
authors: Y
authors: Xu
authors: Runliang
authors: R
authors: Zhu
authors: Fangqin
authors: F
authors: Yu
authors: Menjun
authors: M
authors: Zhu
authors: Minghung
authors: M
authors: Wong
mesh_terms: D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry / Q000633:toxicity*; D048408:Chlorella vulgaris / Q000187:drug effects* / Q000254:growth & development; D006841:Hydrocarbons, Aromatic / Q000737:chemistry / Q000633:toxicity*; D015394:Molecular Structure; D013501:Surface-Active Agents / Q000737:chemistry / Q000633:toxicity*; D018675:Toxicity Tests; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000633:toxicity*
chemical_list: D002593:Cetrimonium Compounds; D006841:Hydrocarbons, Aromatic; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D000077286:Cetrimonium