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KMID : 0895420060160020091
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Journal of Korean Society of Occupational and Enviromental Hygiene
2006 Volume.16 No. 2 p.91 ~ p.100
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Validation of an Extraction Method for the Determination of Airborne MWFs using Alternative Solvents
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Jeong Jee-Yeon
Paik Nam-Won
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Abstract
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The purpose of this study was to validate alternative method by using non-carcinogenic, and less toxic solvents than NIOSH analytical method 5524 for measuring the airborne MWFs in workplaces. In laboratory tests, the ETM solvents(mixture of same volume for ethyl ether, toluene, and ethanol) were selected. The alternative method of analyzing MWFs, referred to as the ETM solvent extraction method, showed 0.04 mg/sample as LOD, and 0.15 mg/sample as LOQ. The analytical precision (pooled CV, coefficient of variation) of the ETM solvent extraction method for analyzing the straight, soluble, semisynthetic, and synthetic metalworking fluid was 1.5%, 2.0%, 2.6%, 1.6%, respectively, which was similar to the precision (2.6%) of NIOSH analytical method (NIOSH 0500) for total dust. The analytical accuracy by recovery test, spiked mass calculated as extractable mass, was almost 100%. As the result of storage stability test, metalworking fluid samples should be stored in refrigerated condition, and be analyzed in two weeks after sampling. The 95% confidence limit of the estimated total standard error for the ETM solvent extraction method for analyzing the straight, soluble, semisynthetic, and synthetic metalworking fluid was 12.6%, 12.5%, 14.0%, and 13.6%, respectively, which satisfied the OSHA sampling and analytical criteria.
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KEYWORD
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metalworking fluids, solvent extraction gravimetric method, accuracy, precision, sample stability
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