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Giamarchi, Philippe; Stephan, Ludovic; Salomon, S.; Bihan, A. Le

doi:10.1023/a:1009434631275

Cited by 17 publications

(8 citation statements)

References 16 publications

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“…This type of behavior in the variance (and hence the covariance) is not unexpected since shot noise exhibits a square-root dependence on the signal intensity and icker noise is directly proportional to the signal intensity. 6 However, another feature that is prominent in the m esh plot of Fig. 2 is the positive offset everywhere.…”

Section: Resultsmentioning

confidence: 91%

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Application of Maximum Likelihood Principal Components Regression to Fluorescence Emission Spectra

2002

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The application of maximum likelihood multivariate calibration methods to the fluorescence emission spectra of mixtures of acenaphthylene, naphthalene, and phenanthrene in acetonitrile is described. Maximum likelihood principal components regression (MLPCR) takes into account the measurement error structure in the spectral data in constructing the calibration model. Measurement errors for the fluorescence spectra are shown to exhibit both a heteroscedastic and correlated noise structure. MLPCR is compared with principal components regression (PCR) and partial least-squares regression (PLS). The application of MLPCR reduces the prediction errors by about a factor of two over PCR and PLS when a pooled estimate of the measurement error covariance matrix is employed. However, when only the heteroscedascity is incorporated into MLPCR, no improvement in results is observed, indicating the importance of accounting for correlated measurement errors.

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Section: Resultsmentioning

confidence: 91%

“…The use of multivariate calibration with uorescence emission spectroscopy has been extensively reported in the literature (see, for example, Refs. [6][7][8][9][10][11][12]. A wide variety of other uorescence techniques (excitation spectra, synchronous scanning, excitation-emission spectra) have also been employed in this context.…”

Section: Introductionmentioning

confidence: 99%

Application of Maximum Likelihood Principal Components Regression to Fluorescence Emission Spectra

2002

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“…It would also be interesting to develop multicomponent determination of PAH in mixtures [13,33,34], by use of both the excitation-emission matrix and temporal resolution with data analysis techniques such as principal components regression (PCR) and partial least squares (PLS) analysis.…”

Section: Discussionmentioning

confidence: 99%

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

Giamarchi

Burel

Stephan

et al. 2002

Analytical and Bioanalytical Chemistry

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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.

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“…21 Humic acid-like compounds have been reported in many wastewaters and surface waters as indigenous signatures of leaching of organic materials. [22][23][24][25] Monitoring DOM in aquatic environments has often been used to apportion water mass sources, because each chromophore in DOM reflects the depositional environment of the organic matter. 26 However, standard methods for monitoring of DOM in waters associated with shale gas extraction operations are not currently available.…”

Section: Introductionmentioning

confidence: 99%

“…21 Humic acid-like compounds have been reported in many wastewaters and surface waters as indigenous signatures of leaching of organic materials. 22–25…”

Section: Introductionmentioning

confidence: 99%

Environmental screening of water associated with shale gas extraction by fluorescence excitation emission matrix

Nieuwburgh

Watson

Weiß

et al. 2022

Environ. Sci.: Water Res. Technol.

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Untitled

Cited by 17 publications

References 16 publications

Application of Maximum Likelihood Principal Components Regression to Fluorescence Emission Spectra

Application of Maximum Likelihood Principal Components Regression to Fluorescence Emission Spectra

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

Environmental screening of water associated with shale gas extraction by fluorescence excitation emission matrix

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