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Journal articles
Molecular and atomic ultra trace analysis by laser induced fluorescence with OPO system and ICCD camera
Abstract : This paper presents a synthesis of some analytical potentialities of an equipment designed for both laser induced molecular and atomic fluorescence in the field of ultra-trace analysis (ng 1-1). Excitation of fluorescence was performed with a pulsed Nd:Yag laser coupled to an optical parametric oscillator (OPO). Fluorescence spectra were recorded with a spectrograph and an intensified charge-coupled device (ICCD). The high energy and the tunability of the excitation combined with the sensitivity of the ICCD and the time-resolution provide better limit of detection (LOD) and selectivity. By molecular fluorescence, some major organic contaminants in the environment were studied, i.e. polycyclic aromatic hydrocarbons (PAHs) (benzo[a]pyrene and hydroxypyrene) and a pesticide (carbaryl). The LODs achieved by direct analysis were far below the restricted European values for tap water. Analysis was performed in water containing humic acids using time resolution to avoid the matrix fluorescence. By electro thermal atomisation-laser excited atomic fluorescence (ETA-LEAF), we detected traces of aluminium and lead in seawater. Some general considerations about the signal to noise ratio optimisation are reported. LODs reached the femtogram level. © 2003 Elsevier Science B.V. All rights reserved.
Keywords :
Optical parametric oscillators
Laser beam effects
Charge coupled devices
Aluminum
Organic acids
Pesticides
Polycyclic aromatic hydrocarbons
Seawater
Signal to noise ratio
Electrothermal atomization
Trace analysis
aluminum
carbaril
humic acid
lead
pesticide
polycyclic aromatic hydrocarbon
pyrene derivative
sea water
tap water
atomic absorption spectrometry
camera
chemical analysis
conference paper
energy
excitation
fluorescence
fluorescence spectroscopy
intensified charge coupled device
neodymium laser
optical parametric oscillator
oscillator
pollution
signal noise ratio
synthesis
water analysis
https://hal.univ-brest.fr/hal-01763907
Contributor : Nicolas Renard <>
Submitted on : Wednesday, April 11, 2018 - 2:59:36 PM
Last modification on : Friday, June 21, 2019 - 7:56:04 AM
Contributor : Nicolas Renard <>
Submitted on : Wednesday, April 11, 2018 - 2:59:36 PM
Last modification on : Friday, June 21, 2019 - 7:56:04 AM