Research Group "Analytical Chemistry of Contaminants", Department of Chemistry and Physics, Andalusian Center for the Evaluation and Monitoring of Global Change (CAESCG), University of Almería, Agrifood Campus of International Excellence, ceiA3, E-04120 Almeria, Spain.
Research Group "Analytical Chemistry of Contaminants", Department of Chemistry and Physics, Andalusian Center for the Evaluation and Monitoring of Global Change (CAESCG), University of Almería, Agrifood Campus of International Excellence, ceiA3, E-04120 Almeria, Spain.
Ecotoxicol Environ Saf. 2018 Aug 15;157:285-291. doi: 10.1016/j.ecoenv.2018.03.094. Epub 2018 Apr 5.
A degradation study of quizalofop-p and its commercial products (quizalofop-p-ethyl, quizalofop-p-tefuryl and propaquizafop) in water samples has been performed using ultra high-performance liquid chromatography coupled to Orbitrap mass spectrometry (UHPLC-Orbitrap-MS). CHHQ (dihydroxychloroquinoxalin), CHQ (6-chloroquinoxalin-2-ol) and PPA ((R)-2-(4-hydroxyphenoxy)propionicacid) were the main metabolites of this active substance (quizalofop-p) in water. The degradation of the parent compound has been monitored in distilled water. Several commercial products (Panarex®, Master-D® and Dixon®) were used to evaluate the degradation of the target compounds into their metabolites. The concentration of the main active substances (quizalofop-p-tefuryl, quizalofop-p-ethyl and propaquizafop) decreased during the degradation studies, whereas the concentration of quizalofop-p increased. DT of the main active substances ranged from 10 days to 70 days for most of the analytes, so it can be concluded that compounds are medium-high persistent in this matrix. Metabolites, such as PPA, CHHQ and CHQ, were detected in water samples after 7 days of the application of the commercial products at concentrations higher than their limits of quantification (> 0.1 µg/L). CHQ was detected at 1400 µg/L after 75 days of the application of quizalofop-p-ethyl commercial product. CHHQ and CHQ were found at the highest concentrations at 7-45 days after the application of quizalofop-p-tefuryl, whereas PPA was detected at higher concentrations (up to 5.37 µg/L) in propaquizafop samples.
已使用超高效液相色谱-轨道阱质谱联用（UHPLC-Orbitrap-MS）对水样中的精喹禾灵及其商业产品（精喹禾灵乙酯、精喹禾灵特氟隆和精吡氟禾草灵）进行了降解研究。CHHQ（二羟氯喹啉）、CHQ（6-氯喹喔啉-2-醇）和 PPA（（R）-2-（4-羟基苯氧基）丙酸）是该活性物质（精喹禾灵）在水中的主要代谢物。在蒸馏水中监测了母体化合物的降解情况。使用了几种商业产品（Panarex®、Master-D®和 Dixon®）来评估目标化合物降解为其代谢物的情况。在降解研究过程中，主要活性物质（精喹禾灵特氟隆、精喹禾灵乙酯和精吡氟禾草灵）的浓度下降，而精喹禾灵的浓度增加。大多数分析物的主要活性物质（精喹禾灵特氟隆、精喹禾灵乙酯和精吡氟禾草灵）的 DT 为 10 天至 70 天，因此可以得出结论，这些化合物在该基质中具有中高持久性。在应用商业产品 7 天后，在水样中检测到了代谢物，如 PPA、CHHQ 和 CHQ，其浓度高于定量限（>0.1μg/L）。在应用精喹禾灵乙酯商业产品 75 天后，检测到 CHQ 的浓度为 1400μg/L。在应用精喹禾灵特氟隆 7-45 天后，检测到 CHHQ 和 CHQ 的浓度最高，而在精吡氟禾草灵样品中检测到浓度较高（高达 5.37μg/L）的 PPA。
