In situ fluorimetric determination of pesticides on vegetables

TY - JOUR

T1 - In situ fluorimetric determination of pesticides on vegetables

AU - Hassoon, Salah

AU - Schechter, Israel

N1 - Funding Information: This research was supported by the Israel Ministry of the Environment, by the Water Research Institute and by the James Franck Program in Laser Matter Interaction. Discussions with Valery Bulatov on this subject are much appreciated.

PY - 2000/1/24

Y1 - 2000/1/24

N2 - A new method for in situ pesticide quantitation is reported. Direct measurement of two pesticides (methoxychlor and N-(phosphonomethyl)glycine) spiked onto vegetables, has been carried out. The contaminant is detected by spraying the substrate with a probe solution of Nile Red and measuring the resulting solid state fluorescence. A portable, optical fiber-interfaced fluorimeter was constructed for this application. Glass and eggplant peel were used as the solid surfaces. The selectivity of this method, as well as matrix and optical effects of relevance have been studied and discussed. 95% Confidence limits of detection are 0.1-0.3 nmol and calibration is linear up to 4 nmol. Analysis of the two pesticides in mixtures was carried out based on mathematical treatment peaks whose wavelength of maximum intensity depends on the composition of the mixture.

AB - A new method for in situ pesticide quantitation is reported. Direct measurement of two pesticides (methoxychlor and N-(phosphonomethyl)glycine) spiked onto vegetables, has been carried out. The contaminant is detected by spraying the substrate with a probe solution of Nile Red and measuring the resulting solid state fluorescence. A portable, optical fiber-interfaced fluorimeter was constructed for this application. Glass and eggplant peel were used as the solid surfaces. The selectivity of this method, as well as matrix and optical effects of relevance have been studied and discussed. 95% Confidence limits of detection are 0.1-0.3 nmol and calibration is linear up to 4 nmol. Analysis of the two pesticides in mixtures was carried out based on mathematical treatment peaks whose wavelength of maximum intensity depends on the composition of the mixture.

KW - Fluorescence

KW - Pesticide

UR - http://www.scopus.com/inward/record.url?scp=0033982274&partnerID=8YFLogxK

U2 - 10.1016/S0003-2670(99)00747-3

DO - 10.1016/S0003-2670(99)00747-3

M3 - 文章

AN - SCOPUS:0033982274

SN - 0003-2670

VL - 405

SP - 9

EP - 15

JO - Analytica Chimica Acta

JF - Analytica Chimica Acta

IS - 1-2

ER -