Abstract

A magnetic material, ${\rm Fe}_3{{\rm O}_4}@{{\rm ZrO}_{2}}$, was used to enrich an organophosphorus pesticide, fenthion. After enrichment the ${\rm Fe}_3{{\rm O}_4}@{{\rm ZrO}_{2}}$ was treated with NaOH to elute and hydrolyze fenthion. The hydrolysis products, orthophosphate ions, combine to molybdate ions to yield molybdophosphoric acid, which was further reduced with ${\rm SnCl}_2$ to obtain a blue phosphatemolybdate. The content of orthophosphate ions as well as fenthion can be determined through the spectrophotometric method. Adsorption and elution conditions were optimized to obtain an enrichment factor of 12.5. The proposed composite method was successfully used to analyze the fenthion residues on the skin of cucumber and apple samples. The limit of detection was as low as 0.037 mg/Kg, which was close to that of the gas chromatography–mass spectrometer method. The method was simple, rapid, and economic, suitable for the rapid screen of fenthion and the other organophosphorus pesticide in mass samples.

© 2020 Optical Society of America

Multiple kinds of pesticide residue detection using fluorescence spectroscopy combined with partial least-squares models

Rendong Ji, Shicai Ma, Hua Yao, Yue Han, Xiao Yang, Ruiqiang Chen, Yinshang Yu, Xiaoyan Wang, Dongyang Zhang, TieZhu Zhu, and Haiyi Bian
Appl. Opt. 59(6) 1524-1528 (2020)

Color modification of ZnGa₂O₄:Yb³⁺,Er³⁺,Tm³⁺ upconversion phosphors with the doping of Sn⁴⁺ and Ge⁴⁺ ions

Yuan Cheng and Kangning Sun
Appl. Opt. 59(24) 7313-7320 (2020)

Enhancing the sensing behavior of a reduced graphene magnetite-based plasmonic optical fiber sensor

Ali Abdulkhaleq Alwahib, Mohammed A. Saleh, and Mohammed Jalal Abdulrazzaq
Appl. Opt. 61(21) 6110-6118 (2022)

Influence of Ho³⁺ doping on the structural and optical characteristics of ZnO–ZrO₂ nanocomposites synthesized by the solution combustion method

M. K. Musembi, F. B. Dejene, I. Ahemen, and K. G. Tshabalala
J. Opt. Soc. Am. B 37(11) A266-A276 (2020)

Spectral characteristics and optical temperature sensing properties of Er³⁺/Yb³⁺-co-doped phosphate glasses with GeO₂ modification

Bingtao Zhang, Yong Wang, Zigang Zhao, Wei Yan, Mingming Huo, and Guihuan Chen
Appl. Opt. 59(22) 6526-6533 (2020)