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- W2004377475 abstract "The adsorptive characteristics of ionogenic pesticides on powdered activated carbon were described. The effects of pH on the adsorbabilities of MCPB (an acidic pesticide) and imazalil (a basic pesticide) onto powdered activated carbon (PAC) were evaluated by correlating 1-octanol-water partition coefficients (log Pow) with the Freundlich adsorption constants over a pH range of 3∼9. After being corrected with pH, the values of log Pow were found to be linearly related to the logarithm of k (i.e. log k). For MCPB, log k as well as log Pow decreased with the increase of pH in the range of pH>pKa and became constant in the range of pH<pKa, and vise versa for imazalil. Adsorption of ionic species onto PAC became negligible at an ionic strength of ∼10−3 M when pH–pKa was lower than 4 for MCPB and pH–pKa higher than −4 for imazalil. Similar relationship between log k and log Pow was obtained for other four acidic pesticides (bentazone, pentachlorophenol, denoseb and MCPP) and two neutral pesticides (imidacloprid and linuron), which suggested that the log Pow values mainly determined the adsorbabilities of these pesticides onto PAC. The calculation results showed that the activated carbon amount needed (ACAN) for lowering pesticide concentration from 500 to 50 μg/l was also linearly related to log Pow, and the ACAN for bentazone (log Pow, 0.11 at pH=7) was 51.9 mg/l, while that for imazalil (log Pow, 3.80 at pH=8.0) was 3.1 mg/l." @default.
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- W2004377475 date "1998-09-01" @default.
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- W2004377475 title "Adsorptive characteristics of ionogenic aromatic pesticides in water on powdered activated carbon" @default.
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- W2004377475 doi "https://doi.org/10.1016/s0043-1354(98)00014-1" @default.
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