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Kanitta Wongyai. Speciation of Arsenic of the Mae Moh Deposits and Products from Mining and Power Generation Processes. Doctoral Degree(Environmental Technology). King Mongkut's University of Technology Thonburi. KMUTT Library. : King Mongkut's University of Technology Thonburi, 2011.
Speciation of Arsenic of the Mae Moh Deposits and Products from Mining and Power Generation Processes
Name: Kanitta Wongyai
keyword:
Arsenic speciation
Abstract:
Environmental impacts from lignite mining and power generation process in the Mae Moh area include
elevated arsenic (As) concentration within the overburden, lignite and fly ashhottom ash contaminated
to water in the downstream environment. Speciation analysis of arsenic is an important issue in
biomedical and toxicological because different elemental species have different effects on health and
the environment. Arsenic speciation analysis was carried out in overburden, lignite, fly ash and water
samples collected h m the Mae Moh area. The chemical combination five-step sequential extraction method
for the speciation of arsenic in the Mae Moh samples was developed and tested. Each step was
specifically designed targeting various arsenic pools ranging fiom weakly adsorbed to well-crystalline
species. Water samples were collected from the final drainage along a flow path of water from wetland
and also conducted investigation of arsenic concentrations and, speciation a groundwater in the Mae
Moh project. The extracts, were analyzed for the quantification of the four mainly arsenic species
naturally present in the environment: arsenite (the trivalent form, AS the power of lll), arsenate (the pentavalent form,
ASthe power of v), monomethylarseno acid (MMA) and dimethylarsenate acid (DMA) dissolved using high performance
liquid chromatography-inductively coupled plasma-mass spectrometry (HPLC-ICP-MS). HPLC with
suitable for anion-exchange column was used to separate extracted arsenic compounds and ICP-MS was
applied for quantitative arsenic determination after species separation.
A fast chromatographic separation of four arsenic species is achieved in less than 12 min at a solution
flow rate of 0.9 muemL/ min using a 50 nL sample injection. The HPLC-ICPMS interface provides well
defined flow injection profiles at various concentrations, giving a correlation coefficient of 0.999 for each
individual arsenic species calibration curve. The separation was performed on a column: PRP X
100 (150 x 4.1 mm i.d.) anion-exchange column with a guard column fitted (Hamilton) with 15 mM
ammonium phosphate buffer (NH4)2HP04 as mobile phase, the pH at 11. The chromatograms results
showed as the major of inorganic arsenic species, obtained revealed that the main arsenic species found
in arsenic-enriched overburden, lignite and fly ash were AS the power of v and ASthe power of lll and these values, released into
leachate samples, are dependent on the pH, alkalinity of extracted solution and the type of samples (e.g.,
location collected, type of overburden, lignite and combustion conditions). A small amount of arsenic
conversion from inorganic form to organic form of MMA was found, especially the wetland samples that
could be affect by microorganisms. This extraction speciation approach can provide some basic
information for predicting the hydrolytic behavior of arsenic in the Mae Moh water systems. These
results suggest that this developed method can be used for analysis of the four primary arsenic species
of concern in the solid Mae Moh samples and also used to evaluate the stability of arsenic species in
leachate sample to estimate potential health risks of inorganic arsenic in which the analysis of the
sources of inorganic arsenic is critical in the Mae Moh area This study found that overburden samples
was the greatest source of inorganic arsenic intake and the most important phase binding arsenic Mn-Fe
oxide and organic matter or sulfides.
King Mongkut's University of Technology Thonburi. KMUTT Library
Address:
BANGKOK
Email:
info.lib@mail.kmutt.ac.th
Name: Savitri Garivait
Role:
Advisor
Created:
2011
Modified:
2555-10-31
Issued:
2012-10-30
วิทยานิพนธ์/Thesis
application/pdf
CallNumber:
JGSEE313
eng
DegreeName: Doctor of Philosophy
Level: Doctoral Degree
Descipline: Environmental Technology
©copyrights King Mongkut's University of Technology Thonburi
RightsAccess:
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0.032153 วินาที
Kanitta Wongyai
| Title | Contributor | Type |
|---|---|---|
| Speciation of Arsenic of the Mae Moh Deposits and Products from Mining and Power Generation Processes
มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี Kanitta Wongyai | Savitri Garivait Advisor | วิทยานิพนธ์/Thesis |
Savitri Garivait