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KMID : 0895419940040010103
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Journal of Korean Society of Occupational and Enviromental Hygiene
1994 Volume.4 No. 1 p.103 ~ p.116
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An Evaluation of Reference Values Used for Quality Control of the Korean Industrial Hygiene Laboratories
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Abstract
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This study was conducted to evaluate accuracy and precision of reference values used for quality control of the Korean industrial hygiene laboratory for three rounds. Factors affecting on accuracy and precision, including analytical procedures, were investigated. The results are summarized as follows.
1. Pooled relative standard deviation of reference values analyzed by reference laboratories was 2.01-5.91%, and that by both reference laboratories and participated laboratories was 3.18-6.63%. Better results were obtained when results of reference laboratories were employed.
2. Significant relationship was indicated between analytical precision and concentration of materials in samples. Variation increased by decreasing sample concentration.
3. Recoveries of lead and cadmium were about 98.6% and 99.8% respectively. There was a significant difference between lead values with and without recovery correction.
4. Organic, solvent results corrected by desorption efficiency only and those corrected by Both internal standards and desorption efficiency were more accurate than those uncorrected. But, the latter was the best.
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