Abstract
A highly reproducible surface-enhanced Raman scattering (SERS) unsupported liquid-state platform (ULP) was developed for accurate quantitative determination of triazophos. Herein, citrate-reduced Ag NPs suspension was concentrated and placed in a stainless steel perforated template to form the SERS ULP. The relative standard deviation of the SERS measurements was less than 5% (n ≥ 10), and the R2 of the calibration curve was 0.994. The developed SERS ULP was applied for determination of triazophos in spiked agricultural products (rice, cabbage, and apple). Experiment results showed that the coefficient of variation ranged from 5.3 to 6.2% for intra-day and from 5.5 to 6.3% for inter-day (n = 3), which proved excellent SERS reproducibility. Moreover, the results were in good agreement with those from HPLC analysis. As a liquid-state SERS substrate, the highly reproducible ULP can perform precision quantitative analysis without surface modification of NPs, which is a significant improvement. This method provides a new perspective for quantitative SERS analysis of pesticide residues.
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Funding
The author would like to thank for the financial supports of the National Natural Science Foundation of China (Grant Nos. 21677117, 21777131), Open Fund from Key Laboratory of Luminescent and Real-Time Analytical Chemistry (Southwest University, China), and research on water pollution control and remediation technology of black and malodorous urban river (2018SZDZX0026) supported by Sichuan Science and Technology Program.
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Liu, W., Huang, Y., Liu, J. et al. Unsupported liquid-state platform for SERS-based determination of triazophos. Microchim Acta 187, 502 (2020). https://doi.org/10.1007/s00604-020-04474-6
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DOI: https://doi.org/10.1007/s00604-020-04474-6