03791nas|a2200409 i 4500 20260818094036.0 040430s2003 th u m rtt 00| a1eng d .b11923945 AIT Thesis no.EV-03-8 Zang, Kaisai The distribution of bisphenol-a/alkylphenols in water environments Pathum Thani, Thailand : Asian Institute of Technology, 2003 70 leaves : ill. Thesis ; no. EV-03-8 Thesis (M.Eng.) - Asian Institute of Technology, 2003 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. Endocrine disrupting chemicals (EDCs) have been shown to produce changes in the endocrine system of organisms that may lead to increases in cancers and abnormalities in reproductive structure and function. It now is being linked as potentially responsible for various human health problems. However, many EDCs are still used widely in industrial and agricultural activities. The study of EDCs in aquatic system has been developed in several countries. However, to our knowledge, we haven't found related study in Thailand. The target EDCs in this study are 4-tert-butylphenol (BP) and nonylphenol (NP), which are degradation products of a large amount of nonionic surfactants widely used in industrial activities but not ready to degraded, and bisphenol A (BP A), which is raw material used in polyhydrocarbon and resin production. Target EDCs were analyzed, using liquid-liquid extraction followed by GC/MS. In this study, BP A was found to be a widely contaminates with a high concentration in highly polluted canAls in (or near) Bangkok (0.918 o,g/L in Klong San Sap; 1.168 o,g/L in Klong I of Pathum Thani and 1.282 o,g/L in Klong Dan). NP and BP were found in higher levels in Klong Dan (0.780 o,g/L of BP and 0.496 o,g/L of NP), a Canal downstream of Bangplee industrial zone than in the other two without significant industrial activities. BPA was also found in a very high level in the effluent of Bang Pa-In industrial wastewater treatment plant (WWTP) (8.176 o,g/L). The selected canals in Bangkok have a low level NP contamination but quite high level of BP A contamination. With the suggested range of estrogenic concentration, under current contamination levels, the estrogenic effects of both NP and BP A on local aquatic organisms can not be ruled out. Concerns are need on target EDCs contaminations. The water bodies with types of industrial activities involved can be mainly focused in BP and NP monitoring program and the water body polluted by both industrial and domestic wastewaters could be focused on in further BPA monitoring program. Water Environmental aspects Hormones Endocrine toxicology Satoh, Hiroyasu, Chairperson Nguyen, Thi Kim Oanh, Examination Committee Preeda Pakpian, Examination Committee Asian Institute of Technology Fellowship, Scholarship donor Asian Institute of Technology. Thesis ; no. EV-03-8 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B08212 .b11923945 mnait u 240417 0 040430 m a u 4 mnait mnarc 22 40 Barcode : 30050120707624 CREATED : 2014-04-02 RECORD # : i12756532 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160051321 CREATED : 2016-05-24 RECORD # : i12990334 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 31122 31122 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-03-8 30050120707624 2026-08-18 09:40:36 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-03-8 30050160051321 2026-08-18 09:40:36 2026-08-18 40