The maintenance of the second-order advantage: Second-order calibration of excitation–emission matrix fluorescence for quantitative analysis of herbicide napropamide in various environmental samples

• Published in: Talanta (Oxford) Vol. 85; no. 1; pp. 325 - 332
• Main Authors: Li, Yuan-Na, Wu, Hai-Long, Qing, Xiang-Dong, Nie, Chong-Chong, Li, Shu-Fang, Yu, Yong-Jie, Zhang, Shu-Rong, Yu, Ru-Qin
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.07.2011; Elsevier
• Subjects: Analysis methods; Analytical chemistry; Applied sciences; APTLD; Calibration; Calibration maintenance; Chemistry; Environmental Monitoring - methods; Environmental Pollutants - analysis; Exact sciences and technology; Excitation–emission matrix fluorescence; Fluorescence; Global environmental pollution; Herbicides - analysis; Limit of Detection; Mathematical analysis; Mathematical models; Matrices; Matrix methods; Naphthalenes - analysis; Napropamide; Natural water pollution; Pollution; Rivers; Second-order calibration; Soil Pollutants - analysis; Spectrometric and optical methods; Spectrometry, Fluorescence - methods; Spectrometry, Fluorescence - standards; Waste water; Water Pollutants, Chemical - analysis; Water treatment and pollution; Calibration maintenance; APTLD; Excitation–emission matrix fluorescence; Napropamide; Second-order calibration; Performance evaluation; Second order; Citrate; Fluorescence; Fluorescence spectrometry; Waste water; Hydrochloric acid; Detection limit; Test method; pH; Quantitative analysis; Excitation-emission matrix fluorescence; Sample; Pesticides; Interference; Calibration; Maintenance; Buffer solution; Sediments; Algorithm; Herbicide; Soils; Sodium; Simultaneous measurement; Chemical decomposition; Environment; River water
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2011.03.067

A rapid non-separative spectrofluorometric method based on the second-order calibration of excitation–emission matrix (EEM) fluorescence was proposed for the determination of napropamide (NAP) in soil, river sediment, and wastewater as well as river water samples. With 0.10molL−1 sodium citrate–hydrochloric acid (HCl) buffer solution of pH 2.2, the system of NAP has a large increase in fluorescence intensity. To handle the intrinsic fluorescence interferences of environmental samples, the alternating penalty trilinear decomposition (APTLD) algorithm as an efficient second-order calibration method was employed. Satisfactory results have been achieved for NAP in complex environmental samples. The limit of detection obtained for NAP in soil, river sediment, wastewater and river water samples were 0.80, 0.24, 0.12, 0.071ngmL−1, respectively. Furthermore, in order to fully investigate the performance of second-order calibration method, we test the second-order calibration method using different calibration approaches including the single matrix model, the intra-day various matrices model and the global model based on the APTLD algorithm with nature environmental datasets. The results showed the second-order calibration methods also enable one or more analyte(s) of interest to be determined simultaneously in the samples with various types of matrices. The maintenance of second-order advantage has been demonstrated in simultaneous determinations of the analyte of interests in the environmental samples of various matrices.