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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Adsorption of Nonylphenol Polyethoxylate Using HCl-Treated Fish Scales of Barbonymus gonionotus in the Presence of Anionic Surfactant) ผู้เขียน: Nisakorn Thongkon, Sureewan Yaodusit, Janjira Thongdee สื่อสิ่งพิมพ์:pdf AbstractThe adsorption of nonylphenol polyethoxylate (NPnEO; n=3–13, n~9), by HCl-treated fish scales (HTS) was enhanced significantly after the pre-adsorption of sodium dodecylbenzene sulfonate (SDBS) onto the HTS. The amount of SDBS adsorbed increased with the contact time, resulting in a monolayer coverage of the HTS (SBHTS) before NP9EO adsorption. The maximum percentage of NP9EO adsorption onto the SBHTS was 92.3% for 180 min. The adsorption processes were found to follow a pseudo-second-order type. The adsorption isotherm of NP9EO onto the SBHTS could be explained better using the Langmuir model than with the Freundlich model and the former produced a best fit with a correlation coefficient value of 0.999 and a steric hindrance effect of SDBS. The thermodynamic parameters, the enthalpy, the entropy and the Gibbs free energy changes were calculated as well, and their values indicated that the adsorption processes were spontaneous and endothermic. Investigation of the adsorption ability of fish scales may result in a better understanding of the parent compound (NP9EO) accumulation in fish. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Surfactants and Temperature on Triclopyr Activity in Eupatorium adenophorum) สื่อสิ่งพิมพ์:pdf AbstractThe effect of surfactants and temperature on triclopyr (((3, 5, 6-trichloro-2-pyridinyl) oxy) acetic acid) activity in Eupatorium adenophorum Spreng were studied at the Royal Ang Khang Highland Agriculture Research Station, Fang District, Chiangmai and at the Department of Agronomy and Central Laboratory, Kasetsart University, Bangkok, Thailand. Triclopyr plus surfactants at the rate of 0.25% (v/v) controlled E. adenophorum better than triclopyr alone under both field and greenhouse conditions. When comparing the two surfactants used in this experiment, OPEO (octyphenol ethylene oxide), a nonionic surfactant was more effective than SABS (sodium alkyl benzenes sulfonate), an anionic surfactant. At 25 degree C triclopyr plus OPEO provided better control than at 15 degree C. There was a tendency to increase superscript 14 C-triclopyr absorption in plants when applied in combination with OPEO. There was 2-3 times as much superscript 14 C-triclopyr absorped in plants at 25 degree C when compared to 15 degree C in a 12 hours period. Absorbed 14 C-triclopyr translocated up and down to other plant parts of E. adenophorum. The sequence of 14 C-triclopyr accumulation were the treated leaf, parts below the treated leaf, parts above the treated leaf and roots respectively. At 25 degree C, the amount of 14 C-triclopyr found in any plant part was greater than at 15 degree C at both 1 and 5 days after treatment. At 15 degree C or 25 degree C, there was some degradation of 14 C-triclopyr in plant parts below the treated leaf at 5 and 10 days after treatment but no degradation occurred in the other plant parts. |
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