04221nas a2200445 a 4500 20260818112757.0 100204s2009 th uu|m rtt 0| a1eng d .b12072618 AIT Diss. no.EV-09-03 Chate Jaikanlaya The evaluation of PCBs contamination on the Eastern coast of Thailand using chemical and biological techniques Pathum Thani, Thailand : Asian Institute of Technology, 2009 177 p. : ill. Dissertation ; no. EV-09-03 A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Environmental Engineering and Management Inter-University Program on Environmen tal Toxicology, Technology and Management Thesis (Ph.D.) - Asian Institute of Technology - Chulabhorn Research Institute - Mahidol University, 2009 Polychlorinated biphenyls (PCBs) are a large group of persistent organic substances spread throughout the world. The most toxic PCBs are those that are dioxin-like (dl-PCBs). Environmental studies on PCBs in Thailand are limited, especially with regards to dl-PCBs. This study demonstrates contamination of some seafood species and catfishes with PCBs and determines the levels of PCBs and total dioxin like activity in mussels, oysters, and shrimp and catfish from the Eastern coast of Thailand covering two provinces which are Chonburi and Rayong. Sixty pooled samples of mussels and twenty-seven pooled samples of oysters were collected from cultivation farms, twenty-one pooled samples of shrimp were collected from fisherman piers, and twenty-nine pooled samples of catfishes were collected from the natural reservoir and catfish's farm from Chonburi province. Qualitative and quantitative measurements of 49 PCB congeners were obtained by HRGC-ECD analysis and total dioxin-like activity using the CAFLUX bioassay. Total PCB concentrations varied between the four species, ranging between 19.18 to 1,100.57 ng g⁻¹ lipid adjusted weight, with the levels of PCBs in shrimp being three times higher than that in mussels, oysters and catfish. With respect to the pattern of PCB congeners, it implied that the source of PCBs exposure in this area was likely from regional contamination. The calculated CAFLUX bioanalytical equivalents (BEQs) values ranged between 0.84 to 18.39 pg BEQ g⁻¹ lipid weight, and showed a good relationship with the chemical-derived TEQs. Therefore, the CAFLUX bioassay can be used for effective screening of dioxin-like activity in marine species. The levels of total PCBs present in this area are lower than the levels recommended by US FDA and European countries such as Belgium, Germany and The Netherlands. The daily intake of dioxin-like compounds from these four biotic species is much lower than the WHO limit value Polychlorinated biphenyls Evaluation Thailand Water Pollution Thailand Mathuros Ruchirawat, Chairperson Preeda Pakpian, Examination Committee Van Den Berg, Martin, Examination committee Settachan, Damm, Examination committee Asian Institute of Technology fellowship, Scholarship donor Chulabhorn Research Institute, Scholarship donor Mahidol University, Scholarship donor IRAS, Utrecht University, The Netherlands, Scholarship donor Asian Institute of Technology. Dissertation ; no. EV-09-03 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B00550 .b12072618 mnait u 240329 0 100204 m a u 4 mnait mnarc 22 40 Barcode : 30050120553945 CREATED : 2012-08-16 RECORD # : i12687078 LPATRON : 1028073 LCHKIN : 2018-05-28 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050160004197 CREATED : 2016-09-02 RECORD # : i12879022 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 41124 41124 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Diss. no.EV-09-03 30050120553945 2026-08-18 11:27:57 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Diss. no.EV-09-03 30050160004197 2026-08-18 11:27:57 2026-08-18 40