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| Amouroux, D; Donard, Ofx. |
| The Scopoletin-Peroxidase fluorescence decay method has been developed using standard additions and a flow injection manifold for hydrogen peroxide (H2O2) determination in marine waters. The limit of detection of the method was optimized using stored milli-Q water with a minimum of 5 nM (3 sigma). The method was found to be linear from 5 to 700 nM, with an approximate relative standard deviation of 10%. This accuracy was verified on both milli-Q and natural waters running systematically duplicate analysis. The validity and the sensitivity of the technique was studied through the influence of pH, salinity and the dissolved organic matter (DOM) concentration. Standard additions avoided all matrix and experimental interferences, making it possible to use this... |
| Tipo: Text |
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| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00097/20784/18409.pdf |
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| Donard, Ofx; Michel, Pierre. |
| The fate of trace metals in the environment and their impact have been a major concern for more than 20 years. Most previous studies have been limited to total metal determination. in general organometallic forms of metals are much more toxic than their inorganic counterparts. Today, the linking of gas or liquid separation techniques with atomic spectrometry detectors will help improve our understanding of the intricate and critical cycles of organometallic forms of metals and metalloids throughout the environment. |
| Tipo: Text |
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| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00190/30167/28750.pdf |
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| Souza Sierra, Mmde; Donard, Ofx. |
| Recent studies have revealed differences between the fluorescence spectra of coastal and open seawater. We investigate here the extent to which abiotic parameters such as pH, ionic strength and concentration of dissolved fluorescent matter could be related to this phenomenon. First, pH effect was addressed alone. Second, a 2 super(3) factorial experimental design was used to estimate the individual and/or combined contribution of the parameters mentioned above to the spectroscopic characteristics of dissolved organic matter represented here by the Suwannee River Fulvic Acid. High pH variations modify the spectroscopic characteristics of organic matter both qualitatively and quantitatively and those effects seem to be related to the dissociation of the... |
| Tipo: Text |
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| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00267/37870/35951.pdf |
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