03157nas|a2200409 i 4500 20260818100350.0 020118s2001 th uu m rtt 00| a1eng d .b1184193x AIT RSPR no. EV-01-01 Lee, Yi Te Environmental stability of arsenic-protein complex Bangkok : Asian Institute of Technology, 2001 35 leaves Research studies project report ; no. EV-01-01 A research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 2001 By analyzing accumulated arsenic (As) in hair, As level can be identified for chronic arsenic toxicity. The relationship between arsenic levels and degree of toxicity is only very approximate. The objectives of this study are to observe the pH stability and biodegradability of arsenic-keratin complex in hair. The experiment was set up at different pH (4, 7, 10) and extraction time. The biodegradability test was carried in anaerobic condition. The arsenic concertration was measured by Atomic Absorpting Spectrophotometer associated with arsine hydride generator. In the pH range of 4 to 10, the predominant As3+ compound is neutral in charge, while the AS5+ species are negatively charged. The arsenic release percentage increased with the extraction time. The arsenic released in lower pH shown higher concentration than that of higher pH. For the biodegradability tes, it did not show any significant amount of arsenic. The pH and extraction time affects the arsenic-keratin complexes in hair. Nevertheless, compare wtih the intital arsenic concentration in hair, the released percentage is quite low, which signifies that arsenic-keratin complex(hair) is a stable compound. Arsenic Toxicology Arsenic Environmental aspects Preeda Pakpian, Chairperson Fukushi, Kensuke, Examination Committee Nguyen, Cong Thanh, Examination Committee Asian Institute of Technology. Research studies project report ; no. EV-01-01 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B00061 .b1184193x mnait u 240329 0 020118 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050120613418 CREATED : 2002-01-18 RECORD # : i12267235 LPATRON : 1015151 LCHKIN : 2018-07-07 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 8 TOT RENEW : 2 Barcode : 30050120613400 CREATED : 2002-01-18 RECORD # : i12267247 LPATRON : 1015945 LCHKIN : 2004-11-23 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 10 TOT RENEW : 6 Barcode : 30050120220529 CREATED : 2016-01-04 RECORD # : i12920204 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 39492 39492 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT RSPR no. EV-01-01 30050120613418 2026-08-18 10:03:50 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT RSPR no. EV-01-01 30050120613400 2026-08-18 10:03:50 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT RSPR no. EV-01-01 30050120220529 2026-08-18 10:03:50 2026-08-18 40