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首页> 外文期刊>Journal of the Brazilian Chemical Society >Multiresidue determination of herbicides in environmental waters from Primavera do Leste Region (Middle West of Brazil) by SPE-GC-NPD
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Multiresidue determination of herbicides in environmental waters from Primavera do Leste Region (Middle West of Brazil) by SPE-GC-NPD

机译：SPE-GC-NPD对巴西中西部Primavera do Leste地区环境水中的除草剂进行多残留测定

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摘要

A study on the presence of herbicides, namely simazine, metribuzin, metolachlor, trifluralin, atrazine and two metabolites, deisopropylatrazine (DIA) and deethylatrazine (DEA), was performed in ground and surface waters from Primavera do Leste region, Mato Grosso state (Middle West of Brazil). The analytical procedure was based on solid-phase extraction (SPE) with Sep-Pak C-18 disposable cartridges and ethyl acetate for elution solvent. Residue levels were determined by gas chromatography with nitrogen-phosphorus detection. For most of the pesticides average recoveries at different fortification levels were > 70% with relative standard deviation < 19%. The recoveries of DIA and trifluralin in water were 25% and 56%, respectively, which were attributed to the incomplete retention of DIA and strong retention on the sorbing material and high volatility of trifluralin. Detection limits ranged from 0.023 to 0.088 mu g L-1. This method was applied for the analysis of 5 superficial water samples and 28 groundwater samples, in places used for human consumption without previous treatment, collected in Primavera do Leste, Mato Grosso, Brazil. Results indicated that the highest level of contamination in a water sample was 1.732 mu g L-1 for metolachlor, while metribuzin was the most frequently detected herbicide with maximum concentration of 0.351 mu g L-1.
机译：在马托格罗索州Primavera do Leste地区的地下水和地表水中进行了关于除草剂simazine，metribuzin，异丙甲草胺，三氟拉林，阿特拉津和两种代谢物去异丙基去津（DIA）和去乙基去津（DEA）的存在的研究（中巴西西部）。分析程序基于使用Sep-Pak C-18一次性色谱柱的固相萃取（SPE）和用于洗脱溶剂的乙酸乙酯。通过气相色谱法和氮磷检测法测定残留水平。对于大多数农药，在不同强化水平下的平均回收率> 70％，相对标准偏差<19％。 DIA和三氟拉林在水中的回收率分别为25％和56％，这归因于DIA的保留不完全，吸附材料的保留力强以及三氟拉林的高挥发性。检出限为0.023至0.088微克L-1。该方法用于在未经事先处理的人类消费场所中对5个表层水样品和28个地下水样品进行了分析，这些样品收集于巴西马托格罗索州的Primavera do Leste。结果表明，水样品中的甲草胺的最高污染水平为1.732μg L-1，而甲霜灵是最常检测到的除草剂，最大浓度为0.351μg L-1。

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