Laser-induced fluorescence with an OPO system. Part I. Optimisation of the analytical system by use of experimental design methodology. Application to the direct quantification of traces of benzo[ a]pyrene.
This study deals with the optimisation and application of a method for direct analysis of trace pollutants in water by laser-induced fluorescence. The arrangement used consisted of an Nd:YAG Laser coupled with an optical parametric oscillator (LYOPO) and connected to a spectrophotometer and a high-sensitivity camera. Optimisation was achieved by developing an experimental design methodology to maximise the signal-to-noise ratio and reduce the limit of detection. The technique was then applied to the detection of benzo[ a]pyrene in water. The experimental results were evidence of its high sensitivity and time-resolution potential. The detection limit for benzo[ a]pyrene was 0.7 ng L(-1) in drinking water and 4 ng L(-1) in raw water containing 1 mg L(-1) humic acids.
Giamarchi
P
P
UMR - CNRS 6521, University of Bretagne Occidentale, 6 Av. Le Gorgeu, BP 809, 29285 Brest Cedex, France.
Burel
L
L
Stephan
L
L
Lijour
Y
Y
Le Bihan
A
A
D001564:Benzo(a)pyrene / Q000032:analysis*; D006812:Humic Substances; D007834:Lasers; D013050:Spectrometry, Fluorescence / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D006812:Humic Substances; D014874:Water Pollutants, Chemical; D001564:Benzo(a)pyrene