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Dredging influenced sediment toxicity of endosulfan and lindane on black tiger shrimp (Penaeus monodon Fabricius) in Chantaburi River estuary in Thailand

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International Journal of Sediment Research 2009年第4期24卷 455-464页

作者： Jayakody Arachchige SUMITH preeda parkpian Napaporn LEADPRATHOM Environmental Engineering and Management Program School of EnvironmentResources and DevelopmentAsian Institute of Technology Current affiliation:Office of the Registrar of Pesticides Department of Agriculture Department of Biology University of New Brunswick Faculty of Marine Technology Burapha university (Chantaburi Campus)

Series of experiments, including background sediment elutriate, spiked-sediment elutriate and spiked- water toxicity tests, were carried out to study the effect of dredging on survivability and ecological competence of commercially important shrimp postlarvae of Penaeus monodon Fabricius. The test sediment represented the most contaminated from endosulfan and lindane in the Chantaburi river mouth estuary. The maximum sediment contamination levels were 49.4 μg/kg of endosulfan and 58.1 μg/kg of lindane in dry weight basis. Dose-response studies in static, non-renewal spiked-sediment elutriate toxicity tests revealed that LC 50 (96 h) values for survival effect based on measured concentrations were 0.50 (0.26-0.95) μg/L for endosulfan and 0.92 (0.63-1.34) μg/L for lindane. The LOECs for endosulfan and lindane were 0.141 and 0.429 μg/L, respectively. The NOECs were estimated to be the dissoluted endosulfan and lindane concentrations from the Chantaburi estuary sediment. The effects on phenoloxidase enzyme activity in shrimp postlarvae exposed for sub-lethal to lethal doses in sediment elutriate were not significant (p>0.05) at all tested dose levels. The worst case dissolution concentrations of endosulfan and lindane in the water column upon simulatory dredging in the Chantaburi estuary were found to be toxic to shrimp postlarvae on lethal and sub-lethal effects. The NOECs of respective chemicals (i.e., 0.034 and 0.16 μg/L) shared the same orders of magnitude for corresponding NOECs established for whole salt water aquatic life by the USEPA and "safe" levels calculated by 0.01 safety factor approach. In addition, the significance of multiple pollutant assessments for ecological toxicity testing is highlighted.

关键词： Acute toxicity Dredging Elutriate Endosulfan Lindane Penaeus monodon Phenoloxidase

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A Simple Detection of Hg （11） down to ppm Level Employing Rhodamine Hydrazine Impregnated on a Solid-Phase Membrane

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Journal of Chemistry and Chemical Engineering 2011年第5期5卷 383-392页

作者： Suntorn Suwannashom Syarifah Hikmah Julinda preeda parkpian Srung Smanmoo National Center for Genetic Engineering and Biotechnology 113 Thailand Science Park Klong Luang Pathumthani 12120Thailand School of Environment Resources and Development Asian Institute of Technology Klong Luang Pathumthani 12120 Thailand Department of Chemistry Faculty of Science and Technology Rajabhat Valaya Alongkorn University Klong Luang Pathumthani13180 Thailand

In the methanolic solution, the selectivity of rhodamine hydrazide （RhH） was simply switched from Cu2＋ to Hg2＋ ions. For the optimal absorption of RhH onto a solid-phase membrane, pure methanol was used to dissolve RhH prior to the impregnation. Of solid-phase membranes tested, the filter paper was chosen due to its cost-effectiveness and good detection limit of Hg2＋ ion. The detection limit of the RhH impregnated filter paper for the detection of Hg2＋ ion was determined to be under 2 ppm both fluorescent and colorimetric detection.

关键词： Fluorescent sensor colorimetric sensor rhodamine hydrazine Hg2+ ion.

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