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KMID : 0895420070170010021
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Journal of Korean Society of Occupational and Enviromental Hygiene
2007 Volume.17 No. 1 p.21 ~ p.30
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The effect of cristobalite on quantitative analysis of quartz in respirable dust by FTIR direct-on-filter method
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Phee Young-Gyu
Roh Young-Man
Kim Hyun-Wook
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Abstract
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To establish the Fourier-transform infra-red spectrophotometry (FTIR) direct-on-filter(DOF) technique as a useful analytical method for quartz in respirable dust samples, influence of the interference should be corrected. This study was designed to compare three methods of correction for cristobalite when quantifying the content of quartz, including the least square, the optimum choice and the spectral subtraction methods. Respirable dust, created in a dust chamber containing the standard material of quartz, cristobalite was collected using a cyclone equipped with a 25 mm, 0.8 ㎛ pore size DM filter as a collection medium. The quartz weights overestimated about 100% when mixed of cristobalite by measure using 799 cm-1 absorption peak of quartz. The quartz weights appeared over estimated by optimum choice, spectral subtraction and least square method in mixtures of 33% cristobalite were 90.3%, 60.1% and about 4.3%, respectively. The least square ethod have been adopted to correction methods of cristobalite and satisfactory results have been obtained. The results of this study suggest that, when correcting for effect of cristobalite on quantitative analysis of quartz in respirable dust by FTIR direct-on-filter method, the least square method produce the most unbiased results compared with those of other correction methods.
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KEYWORD
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Quartz, Cristobalite, FTIR direct-on-filter Method, Interference, correction methods
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