Extractive spectrophotometric method for the determination of carbaryl in environmental samples
作者:D. K. Sharma、T. Dharmani、N. Sharma
DOI:10.4314/bcse.v29i2.2
日期:——
In the view of the potential hazards associated with the widespread use of carbaryl insecticide, a new simple extractive spectrophotometric method has been developed for its determination in environmental samples viz. soil, water and foodstuffs for its safer and more effective use. The proposed method is based on the microwave assisted alkaline hydrolysis of the insecticide to methylamine. The later is measured as methyl isobutyl ketone (MIBK) extractable yellow nickel(II)-methyldithiocarbamate complex at 380 nm through the reaction with carbon disulfide and nickel(II) acetate. The insecticide can be determined in the linearity range from 2.01 to 60.3 µg mL-1 with a correlation coefficient of 0.996. The method has been applied to the analysis of carbaryl in its commercial formulation and its recovery from vegetable and water samples for monitoring health hazards. Recoveries of the insecticide from vegetables and spiked water samples were good, ranging from 87.6-92.8%, with RSDs ranging from 0.54-1.02%. The method has also been validated for investigating the sorption of carbaryl on five soils with different characteristics to evaluate its leaching behaviour which is a measure of ground and surface water contamination. The leaching potential of the insecticide in terms of groundwater ubiquity score (GUS) has values in the range 1.8-2.2 classifying it as transition leacher hence it has potential to contaminate groundwater.
鉴于西维因杀虫剂的广泛使用所带来的潜在危害,我们开发了一种新的简单萃取分光光度法,用于测定土壤、水和食品等环境样品中的西维因含量,以便更安全、更有效地使用该杀虫剂。所提议的方法基于微波辅助碱性水解杀虫剂生成甲胺。之后,通过与二硫化碳和醋酸镍(II)反应,在 380 纳米波长下测量可萃取黄色镍(II)-甲基二硫代氨基甲酸甲酯复合物的甲基异丁基酮(MIBK)。杀虫剂的线性范围为 2.01 至 60.3 µg mL-1,相关系数为 0.996。该方法已被用于分析西维因的商业制剂,以及从蔬菜和水样中回收西维因,以监测对健康的危害。蔬菜和加标水样中杀虫剂的回收率为 87.6%-92.8%,RSD 为 0.54%-1.02%。该方法还验证了西维因在五种不同特性土壤上的吸附情况,以评估其浸出行为,浸出行为是衡量地下水和地表水污染的一个指标。从地下水普遍性评分(GUS)来看,该杀虫剂的浸出潜力值在 1.8-2.2 之间,属于过渡浸出剂,因此有可能污染地下水。