Analysis of Pb by X-Ray absorptiometry and comparison of measurement sensitivity with edxrf and AAS
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Date
1999
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Publisher
University of Colombo: UC(SCI).
Abstract
During the recent years there has been a widespread interest in monitoring Pb levels in air Although several methods are available to measure Pb in airborne dust they are expensive and time consuming From previous work it appeared that the X-Ray absorption edge method could be used in general to determine elements of atomic number Z20 quickly ana accurately. This methods is independent of the matrix and is non-destructive. The study was initiated to examine the feasibility of using this nuclear related method based on X-Ray absorptiometry to measure Pb levels in aerosols and to compare the validity of this method with EDXRF, AAS and dithizone extraction. Ten air samples were collected for 2 - 60 h through 47 mm diameter millipore filters using a high volume air sampler at the University of Colombo,CEA Fort Sampling Centet, NBRO and Meteorologocal Department and analysed using X-Ray absorptiometry, XRF, AAS and dithizone method.Results obtained from three filters with the two nuclear related methods XRF and X-Ray absorptiometry in this study is within 10 deviation while twoother filters had a deviation of 23 \& 20 XRF has a higher sensitivity with a detection limit of 0.06 ug/cm2 while the detection limit of the absorptiometry method is 1.93 ug/cm2. This can be futher improved by using a primary source having a greater activity and also....
Description
Dissertation: M.Sc., University of Colombo: UC(SCI), 1999.
Keywords
Radiography
Citation
NAMASICAYAM, S, Analysis of Pb by X-Ray absorptiometry and comparison of measurement sensitivity with edxrf and AAS, University of Colombo UC(SCI), 1999: p.