不同环境条件杂环农药三维荧光光谱发射特性研究

发布时间：2018-02-04 04:11

本文关键词： 杂环农药三维荧光环境因素荧光特性　出处：《光谱学与光谱分析》2017年03期 　论文类型：期刊论文

【摘要】：掌握不同环境因素下的光谱发射特性是农药准确测量的前提。以多菌灵、西维因、麦穗宁三种杂环农药为研究对象,研究了农药在不同pH值和常见阴、阳离子条件下的三维荧光光谱发射特性,并初步分析了Fe~(3+)和Cu~(2+)对三种农药的荧光猝灭机制。结果表明,多菌灵和麦穗宁均具有两个荧光峰,西维因仅有一个荧光区域,三种农药的主要荧光峰分别位于λ_(ex)/λ_(em)=280/300,310/340和280/335 nm,多菌灵和麦穗宁的次荧光峰Peak B分别位于λ_(ex)/λ_(em)=245/305 nm,λ_(ex)/λ_(em)=250/340 nm;多菌灵与麦穗宁随pH值变化表现为相似的荧光发射特征,在酸性/碱性降低时,荧光强度增大;酸性条件下西维因的荧光发射强度无明显变化,但在碱性条件下,随pH值的减小荧光强度不断增强;三种农药在pH值6.16~7.4范围内均可获得较好的荧光发射特征。水中CO_3~(2-),SO_4~(2-),NO_3~-,Cl~-,HPO_4~(2-),HCO_3~-,Mg~(2+),Zn~(2+),NH_4~+,Na~+,Ca~(2+)和K~+等12种常见离子对多菌灵,西维因和麦穗宁的荧光发射特性无明显影响。Fe~(3+)与Cu~(2+)离子通过静态荧光猝灭反应,影响三种农药的荧光发射强度。随着离子浓度的增加荧光强度不断降低,在实际测量中,需重点考虑Fe~(3+)和Cu~(2+)对测量结果的影响。该研究结果为水体杂环农药的准确测量提供了基础数据。
[Abstract]:Mastering the spectral emission characteristics of different environmental factors is the premise of accurate measurement of pesticides. Three heterocyclic pesticides carbendazim, carbaryl and wheisuanning were studied in different pH values and common yin. The emission characteristics of three dimensional fluorescence spectra under cationic conditions were studied. The fluorescence quenching mechanisms of Fe~(3 and Cu~(2) on the three pesticides were preliminarily analyzed. Carbendazim and Heisuanning had two fluorescence peaks, and carbaryl had only one fluorescence region, and the main fluorescence peaks of the three pesticides were located at 位 _ (+) / 位 _ (+) / (280 / 300) respectively. At 310/340 and 280/335 nm, the sub-fluorescence peak Peak B of carbendazim and wheat pruning was located at 位 _ (+) / 位 _ (?) _ (5 / 305) nm, respectively. 位 / 位 / D 250 / 340 nm; Carbendazim and wheat panicle showed similar fluorescence emission characteristics with the change of pH value, and the fluorescence intensity increased with the decrease of acid / alkalinity. The fluorescence emission intensity of carbaryl did not change obviously under acidic condition, but the fluorescence intensity increased with the decrease of pH value in alkaline condition. The fluorescence emission characteristics of the three pesticides can be obtained in the pH range of 6.16 ~ 7.4. HPO4 / HPO4 / HCO3 / HCO3 / HPO4 / HPO4 / HPO4 / HPO4 / HPO4 / HPO4 / HPO4 / HPO4 / HPO4 / HPO4 / HPO4 / HPO4 /. Ca~(2) and K ~, 12 common ion-pair carbendazim. The fluorescence emission characteristics of carbaryl and wheisuanning had no obvious effect on the fluorescence quenching reaction of Cu~(2). The fluorescence emission intensity of three kinds of pesticides is affected. The fluorescence intensity decreases with the increase of ion concentration, and it is measured in practice. The effects of Fe~(3) and Cu~(2) on the measurement results should be considered. The results provide basic data for the accurate measurement of heterocyclic pesticides in water.
【作者单位】：合肥工业大学资源与环境工程学院;中国科学院安徽光学精密机械研究所环境光学与技术重点实验室;安徽省环境光学监测技术重点实验室;
【基金】：国家自然科学基金项目(61378041) 中国科学院STS计划项目(KFJ-SW-STS-170);中国科学院环境光学与技术重点实验室开放基金项目(2005DP173065-2015-01)资助安徽省科技重大专项(15CZZ04125)
【分类号】：TQ450.7;O657.3
【正文快照】： 系。钟秀娣等研究了噻菌灵的三维荧光光谱特性,结果显示弓I言在酸性条件下荧光发射强度较碱性条件下好,在定量分析中需进行pH值的校正补偿m。Gu等[8]研究H5-竣甲基)-4-农药的快速、准确检测已成为环境监测的一项重要内 (2-(N-乙基咔唑-3-基)乙烯基)吡啶摪溴化物在不同pH值条

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