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KMID : 1039220200300010058
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Journal of Korean Society of Occupational and Environmental Hygiene
2020 Volume.30 No. 1 p.58 ~ p.66
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Sample Development for Quality Control of Formaldehyde and Proficiency Analytical Testing
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Park Hae-Dong
Jang Mi-Yeon
Park Seung-Hyun
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Abstract
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Objective: The objective of this study was to develop formaldehyde samples for quality control (QC) and to test the applicability of proficiency analytical testing in Korea.
Methods: We made formaldehyde samples with certified standard solutions (formaldehyde in water or acetonitrile) and 2,4-dinitrophenylhydrazine (2,4-DNPH)-coated silicagel tubes. Four levels of formaldehyde concentration were tested for storage stability at room temperature and at 4℃ over three months. Analytical proficiency testing was performed with four or 36 institutes.
Results: Formaldehyde sample tubes were easily made through the injection of standard solutions and the average efficiencies of recovery were 95-101%. The coefficients of variation (CV) of the formaldehyde samples were 1.39-2.55%. The recovery efficiencies fell between 90% and 110% at the concentration range of 1-10 μg/sample over three months storage at refrigerated and room temperature. The CVs were less than 5% in the proficiency analytical testing. By adjusted proficient ranges, 64% of the results of the second proficiency analytical testing were acceptable.
Conclusions: The formaldehyde samples made by injection on 2,4-DNPH-coated silicagel tubes were stable and applicable for quality control.
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KEYWORD
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formaldehyde, proficiency analytical testing, quality control
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