000			03157nas|a2200409 i 4500
005			20260818100350.0
008			020118s2001 th uu m rtt 00| a1eng d
035			_a.b1184193x
099		9	_aAIT RSPR no. EV-01-01
100	1		_aLee, Yi Te
245	1	0	_aEnvironmental stability of arsenic-protein complex
260			_aBangkok : _bAsian Institute of Technology, _c2001
300			_a35 leaves
490	1		_aResearch studies project report ; _vno. EV-01-01
500			_aA research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development
502			_aResearch Studies Project Report (M. Eng.) - Asian Institute of Technology, 2001
520			_a 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.
650		0	_aArsenic _xToxicology
650		0	_aArsenic _xEnvironmental aspects
700	0		_aPreeda Pakpian, _eChairperson
700	1		_aFukushi, Kensuke, _eExamination Committee
700	1		_aNguyen, Cong Thanh, _eExamination Committee
810	2		_aAsian Institute of Technology. _tResearch studies project report ; _vno. EV-01-01
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B00061
907			_a.b1184193x _bmnait _cu
902			_a240329
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