A novel long path length absorbance spectroscopy for the determination of ultra trace organophosphorus pesticides in vegetables and fruits

作者：Cheng Xiaohong; Zhang Zhujun^*; Tian Suikang

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2007, 67(5): 1270-1275.

DOI：10.1016/j.saa.2006.10.018

• long path length absorbance spectroscopy (LPAS)
• organophosphorus pesticides
• liquid core waveguide (LCW)
• light intensity difference technique

A simple, rapid, sensitive and reproducible spectrophotometry for determination of ultra trace organophosphorus pesticides (OPs) with liquid core waveguide light intensity technique is presented. OPs were degraded into phosphate with UV light, potassium peroxydisulphate as oxidant and nanosized titanium dioxide as catalyst. Under the optimum selected conditions, linear light intensity response was obtained in the range of 2.0 x 10(-11) to 8.0 x 10(-10) g mL(-1) phosphate, and the limit of detection (LOD) 6.7 x 10(-12) g mL(-1) was achieved. Both the low limit of linear range and the LOD of the proposed method were lower over 1000-fold than that of classical spectrophotometry. The proposed method was applied to the determination of ultra trace OPs in vegetables and fruits samples.

• 出版日期2007-8
• 单位陕西师范大学