title: pH-dependent aquatic criteria for 2,4-dichlorophenol, 2,4,6-trichlorophenol and pentachlorophenol.
abstract: Due to their agricultural as well as industrial uses, 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP), and pentachlorophenol (PCP) are ubiquitous in the environment and recognized as priority pollutants in many countries. In this study, effects of pH on toxicity to the crustacean Daphnia magna and the alga Scenedesmus obliquus were investigated. Combined published toxicity data of the three chlorophenols along with; relationships between toxicity and pH reported here were used to establish pH-dependent water quality criteria (WQC). The WQC expressed as a function of pH, also considered intra-species variation and proportions of taxonomic groups. At pH 7.8, the recommended acute exposure water quality criteria (WQC) were 286.2 μg 2,4-DCP/l, 341.5 μg 2,4,6-TCP/l and 11.4 μg PCP/l. The recommended chronic exposure WQC were 16.3 μg 2,4-DCP/l, 54.6 μg 2,4,6-TCP/land 3.9 μg PCP/l.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 20046, China.
authors.forename: Liqun
authors.initials: L
authors.lastname: Xing
authors.forename: Hongling
authors.initials: H
authors.lastname: Liu
authors.forename: John P
authors.initials: JP
authors.lastname: Giesy
authors.forename: Hongxia
authors.initials: H
authors.lastname: Yu
mesh_terms: D000818:Animals; D002733:Chlorophenols / Q000633:toxicity*; D003621:Daphnia / Q000187:drug effects*; D004784:Environmental Monitoring / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007928:Lethal Dose 50; D010416:Pentachlorophenol / Q000633:toxicity*; D044444:Scenedesmus / Q000187:drug effects*; D014874:Water Pollutants, Chemical / Q000633:toxicity*; D060753:Water Quality / Q000592:standards
chemical_list: D002733:Chlorophenols; D014874:Water Pollutants, Chemical; D010416:Pentachlorophenol; C024564:2,4,6-trichlorophenol; C004762:2,4-dichlorophenol