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  • 09월 23일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제126회 대한화학회 학술발표회 및 총회 Application of Suspect/non-target screening to identify transformation products of pesticides formed in a natural wetland

2020년 9월 28일 20시 11분 28초
ANAL2-3 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
화 16시 : 20분
Analytical Chemistry - Recent Advances in Environmental Mass Spectrometry
저자 및
Junho Jeon
Environmental analytical chemistry, Changwon National University, Korea
Natural wetlands have been recognized as a bio-reactor for degradation and elimination of environmental pollutants (e.g., pesticides). The aim of this study was to identify degradation (or transformation) products of pesticides in the wetland using LC-HRMS based suspect/non-target screening and evaluate the elimination ability of wetland. We used QExactiv Orbitrap with a two-step analysis approach (i.e., 1st analysis for target measurement along with suspect and non-target screening (SNTS) and 2nd analysis for complimentary suspect screening) to identify and quantify the transformation products (TPs) of the identified major pesticides. Quantitative analysis of 30 targets, mainly including pesticides, showed that fungicides were the major contaminants detected in the wetland. Orysastrobin occurred at the highest mean concentration (>700 ng/L), followed by two other fungicides, carbendazim and tricyclazole. The first analysis (SNTS) tentatively identified 39 TPs (30 by suspect, 9 by non-target screening) of 14 parent pesticides. Additionally, the second analysis (complimentary suspect screening) identified 9 more TPs. Among the 48 total TPs identified, 7 were confirmed with reference standards. The identification of the remaining TPs had a high confidence level (e.g., level 2 or 3). Regarding transport though the wetland, most TPs showed greater peak area ratios (i.e., the relative portion of chromatographic area of the TPs to the parent compound) at the outlet point of the wetland compared to the inlet point. The estimates for biodegradability, hydrophobicity, and toxicity by an in-silico quantitative structure-activity relationship (QSAR) model indicated a lower half-life, lower logDOW, and greater effect concentration for most TPs compared to the parent compounds. Based on these results, we conclude that natural wetlands play a role as an eco-friendly reactor for degrading pesticide to form numerous TPs that are lower risk than the parent compounds.