傅里叶变换拉曼光谱法测定农药制剂中的马拉硫磷

FT-Raman spectrometry determination of Malathion in pesticide formulations.

作者信息

Quintás Guillermo, Garrigues Salvador, de la Guardia Miguel

机构信息

Department of Analytical Chemistry, University of Valencia, Edifici Jeroni Muñoz, 50th Dr. Moliner, E46100 Burjassot, Valencia, Spain.

出版信息

Talanta. 2004 May 28;63(2):345-50. doi: 10.1016/j.talanta.2003.11.004.

DOI:10.1016/j.talanta.2003.11.004

PMID:18969438

Abstract

A fast and environmentally friendly method has been developed for Fourier transform-Raman (FT-Raman) spectrometry determination of Malathion in pesticide emulsifiable concentrate formulations. The method is based on the measurement of intensity peak height values at 1737cm(-1) Raman shift corrected using a baseline defined at 1900cm(-1). Samples were diluted with CHCl(3) and the FT-Raman spectra collected in back-scattering mode over 3.3min at a nominal resolution of 4cm(-1) accumulating 50 scans per spectra and using a laser power of 1250mW. The developed procedure provided a limit of detection of 1.8% w/w in the original sample. Results found by FT-Raman spectrometry were statistically comparable with those obtained by flow injection Fourier transform infrared spectrometry, FIA-FTIR, and gas chromatography (GC) and were in good agreement with those reported by the manufacturer. The FT-Raman developed procedure reduces drastically the chlorinated solvent waste generation and avoids the contact of the operator with toxic products, being a fast alternative to the CIPAC recommended GC procedure.

摘要

已开发出一种快速且环保的方法，用于傅里叶变换拉曼（FT - 拉曼）光谱法测定农药乳油制剂中的马拉硫磷。该方法基于测量在1737cm(-1)拉曼位移处的强度峰高值，并使用在1900cm(-1)处定义的基线进行校正。样品用CHCl(3)稀释，并在背散射模式下以4cm(-1)的标称分辨率在3.3分钟内收集FT - 拉曼光谱，每个光谱累积50次扫描，激光功率为1250mW。所开发的方法在原始样品中的检测限为1.8% w/w。FT - 拉曼光谱法得到的结果与流动注射傅里叶变换红外光谱法（FIA - FTIR）和气相色谱法（GC）得到的结果在统计学上具有可比性，并且与制造商报告的结果高度一致。所开发的FT - 拉曼方法极大地减少了氯化溶剂废物的产生，并避免了操作人员接触有毒产品，是CIPAC推荐的GC方法的一种快速替代方法。