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Journal of the Korean Society for Environmental Analysis 2018;21(2):71-77.
Study on the Purification of Environmental Pollutants like Metamifop and Preparation of Standard Material through Various Analytical Methods to Determine Purity
환경오염 물질인 메타미포프의 정제 및 다양한 순도 결정 방법을 통한표준물질 제조 연구
김승환1, 김여진2, 정대원2, 권종국3, 이석기4
1(주)케미다스
2수원대학교
3인천대학교
4우석대학교
Abstract
In this study, we purified an environmental pollutant (metamifop) by re-crystallization under various conditions and prepared four kinds of high-purity reference materials (RM) that show small variations in purity among each other. To measure their purities with uncertainty, four different analytical methods were employed: differential scanning calorimetry (DSC), peak area normalization (HPLC), external calibrant (HPLC), and quantitative NMR (q-NMR). The highest purity of metamifop RM, determined by q-NMR, was 99.02% with an uncertainty of 0.64% compared with 99.36% (with 0.12% uncertainty), 99.46% (with 0.53% uncertainty) and 99.84% (with 0.29% uncertainty), determined by DSC, external calibrant, and peak area normalization, respectively. Most of the evaluated purities are within the calculated uncertainty range
Key Words: Metamifop, Environmental pollutant, Reference materials, Purity, Uncertainty, DSC, q-NMR
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