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http://dx.doi.org/10.15269/JKSOEH.2020.30.1.58

Sample Development for Quality Control of Formaldehyde and Proficiency Analytical Testing  

Park, Hae Dong (Occupational Safety and Health Research Institute, KOSHA)
Jang, Miyeon (Occupational Safety and Health Research Institute, KOSHA)
Park, Seunghyun (Occupational Safety and Health Research Institute, KOSHA)
Publication Information
Journal of Korean Society of Occupational and Environmental Hygiene / v.30, no.1, 2020 , pp. 58-66 More about this Journal
Abstract
Objectives: 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 ㎍/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.
Keywords
formaldehyde; proficiency analytical testing; quality control;
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