Spectrofluorometric determination of pesticide residue mixtures by isodifferential derivative spectroscopy

Sánchez, Francisco; Blanco, C.

doi:10.1021/ac00155a010

Cited by 37 publications

(8 citation statements)

References 15 publications

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“…40 It is also verified that the emission profile of TBZ is not modified by MBC. The excitation spectrum of TBZ does not suffer significant changes in the presence of MBC because TBZ possesses a higher absorptivity than MBC.…”

Section: Chemometric Analysismentioning

confidence: 68%

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Partial least-squares with residual bilinearization for the spectrofluorimetric determination of pesticides. A solution of the problems of inner-filter effects and matrix interferents

Piccirilli

Escandar

2006

Analyst

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This paper demonstrates for the first time the power of a chemometric second-order algorithm for predicting, in a simple way and using spectrofluorimetric data, the concentration of analytes in the presence of both the inner-filter effect and unsuspected species. The simultaneous determination of the systemic fungicides carbendazim and thiabendazole was achieved and employed for the discussion of the scopes of the applied second-order chemometric tools: parallel factor analysis (PARAFAC) and partial least-squares with residual bilinearization (PLS/RBL). The chemometric study was performed using fluorescence excitation-emission matrices obtained after the extraction of the analytes over a C18-membrane surface. The ability of PLS/RBL to recognize and overcome the significant changes produced by thiabendazole in both the excitation and emission spectra of carbendazim is demonstrated. The high performance of the selected PLS/RBL method was established with the determination of both pesticides in artificial and real samples.

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Section: Chemometric Analysismentioning

confidence: 68%

“…The excitation spectrum of TBZ does not suffer significant changes in the presence of MBC because TBZ possesses a higher absorptivity than MBC. 40 It is also verified that the emission profile of TBZ is not modified by MBC. PLS/RBL.…”

Section: Chemometric Analysismentioning

confidence: 68%

Partial least-squares with residual bilinearization for the spectrofluorimetric determination of pesticides. A solution of the problems of inner-filter effects and matrix interferents

Piccirilli

Escandar

2006

Analyst

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“…These limits correspond to concentrations about 40 times lower than that of MBC and 10 times lower than that of 2-AB. These results can be explained by the fact that benomyl is a compound that is metabolized to MBC during ordinary analytical procedures in organic solvents and water [2] [16] [17]. The 2-AB is also a metabolite of MBC, and the three benzimidazoles emit at the same wavelength region.…”

Section: Interference Studies Of Added Foreign Speciesmentioning

confidence: 99%

Spectrofluorimetric Analysis of the Fungicide Carbendazim and Its Metabolite 2-Aminobenzimidazole in Natural Water

Thiaré¹,

Khonté²,

Diop³

et al. 2015

AJAC

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A spectrofluorimetric method for the direct analysis of carbendazim [methyl 2-benzimidazole carbamate (MBC)] fungicide and its metabolite 2-aminobenzimidazole (2-AB) in natural waters is described. Very low limit of detection (LOD) and limit of quantification (LOQ) values of 0.002 -0.06 ng/mL and 0.006 -0.2 ng/mL, respectively, were determined by spectrofluorimetric method with small relative standard deviation (RSD) values < 1%. This spectrofluorimetric method was applied to the determination of MBC and 2-AB residues in natural waters, with satisfactory recovery values of (88.5% -119.2%).

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“…NAD and NOA (Sigma) were used without further purification. Microemulsion stock standard solutions were prepared by dissolving 10 mg of NAD or NOA in 1 ml of dichloromethane and 1 ml of butan-1-ol and diluting to 100 ml with 0.5 mol l 21…”

Section: Reagentsmentioning

confidence: 99%

“…Despite the native fluorescence of NAD, 20,21 the possibility of applying phosphorescence detection has not previously been considered. With respect to NOA, only a few phosphorimetric methods have been proposed, mainly at low temperature, [22][23][24] with only two using room temperature with a solid support 25,26 or micellar 27 or organized media.…”

mentioning

confidence: 99%

Application of Derivative Variable-angle Synchronous Scanning Phosphorimetry in a Microemulsion Medium for the Simultaneous Determination of 2-Naphthoxyacetic Acid and 1-Naphthalenacetamide

Segura‐Carretero¹,

Blanco

Gutiérrez³

1997

Analyst

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The applicability of derivative variable-angle synchronous scanning (DVASS) microemulsion phosphorimetry at room temperature (ME-RTP) was demonstrated for the simultaneous determination of the plant growth regulators 2-naphthoxyacetic acid and 1-naphthalenacetamide in soil samples. This technique permits linear or non-linear paths to be scanned at preselected angles through the excitation-emission phosphorescence matrix in order to obtain the highest signal values and interference-free bands. The phosphorescence emission of the two compounds was obtained using sodium sulfite as an O 2 scavenger and thallium nitrate as an external heavy atom salt perturbed in sodium docecyl sulfate microemulsion aqueous solutions. A statistical model of the central composite design type to obtain the optimum phosphorescence responses was applied. The increased selectivity afforded by the DVASS technique permitted the demonstration of its applicability to the simultaneous determination of phosphorescent signals of these two compounds obtained in a microemulsion medium which show closely overlapped profiles giving mean recoveries of 89.0% (n = 5) for 1-naphthalenacetamide and 103.5% (n = 5) for 2-naphthoxyacetic acid, with an RSD of 7.35 and 5.90%, respectively, in real samples.

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Spectrofluorometric determination of pesticide residue mixtures by isodifferential derivative spectroscopy

Cited by 37 publications

References 15 publications

Partial least-squares with residual bilinearization for the spectrofluorimetric determination of pesticides. A solution of the problems of inner-filter effects and matrix interferents

Partial least-squares with residual bilinearization for the spectrofluorimetric determination of pesticides. A solution of the problems of inner-filter effects and matrix interferents

Spectrofluorimetric Analysis of the Fungicide Carbendazim and Its Metabolite 2-Aminobenzimidazole in Natural Water

Application of Derivative Variable-angle Synchronous Scanning Phosphorimetry in a Microemulsion Medium for the Simultaneous Determination of 2-Naphthoxyacetic Acid and 1-Naphthalenacetamide

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