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KMID : 0895419950050010059
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Journal of Korean Society of Occupational and Enviromental Hygiene
1995 Volume.5 No. 1 p.59 ~ p.67
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A Comparptive Study of Blood Lead Measurement by polarized Zeman Effect Correction AAS and D2 Correction AAS Method
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Abstract
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Blood lead assay by D₂ lamp background correction method of atomic absorption spectrophotometer(AAS) with wavelength of 283.3 nm is most popular in occupational health practice in Korea. On the other hand, D₂ lamp background correction method with wavelength of 217.0 ㎚ is also often used in general chemical analysis for lead assay in general purpose. But both methods have some weakness of background correction which brought direct effect on the results of analysis. Recently blood lead assay with polarized Zeeman effect of AAS was introduced and is now preferred in many laboratory than D₂ correction method in blood lead analysis. But still AAS with D₂ lamp are widely used in the field of occupational health in Korea. This study compared blood lead assay data with D₂ correction methods(283.3 and 217.0 ㎚) and with that of polarized Zeeman effect correction method to evaluate the validity of D₂ correction methods. The results obtained were as follows;
1. Taking the value of polarized Zeeman effect method as reference value of 1.00, the mean relative value of D₂ correction method with wavelength of 217.0 nm was 0.92 and that with wavelength of 283.3 ㎚ was 0.90 respectively in the analysis of blood lead whose value were below 20.0 ㎍/㎗ (p$lt;0.001). Both mean values were statistically smaller than polarized Zeeman effect correction method. But in the analysis of blood whose value were between 20.0 to 40.0 ㎍/㎗, the mean relative value of D₂ correction method was 0.96 in both wavelength and did not differ from polarized Zeeman effect method(p$lt;0.001). There was no difference of blood lead between D₂ correction method and polarized Zeeman effect method in the analysis of blood lead whose value were over 40.0 ㎍/㎗.
2. The variations of background correction value in polarized Zeeman effect method were not changed by increase of blood lead, but those in D₂ correction methods were increased by the increase of blood lead.
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