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sample<br />

1 - extraction (toluene methanol-soxhlet)<br />

2 - pentane, water + sodium chlorida<br />

weight before saponification<br />

AVSP<br />

saponification with KOH<br />

weight after saponification<br />

APSP<br />

separation with SEP PAK<br />

hexane elution chloroform elution<br />

fraction hydrocarbons.<br />

FA<br />

polar fraction<br />

Each fraction was weighted by gravimetry (Balance: Perkin Elmer AD2Z, 1/10 of<br />

ug) . In each case, the fraction FA was chroma tog raphed on a capillary column<br />

(OV1 or SE52) with a Girdel or a Carlo Erba Fractovap 4160. The fractions FA<br />

and FB were also analyzed by high-pressure liquid chromatograph (column RP 18,<br />

radial pressure, Waters-type detector). Since the FA fraction may contain<br />

saturated, unsaturated, or aromatic hydrocarbons, fluorescence spectrometry<br />

(Perkin Elmer 3000) was used especially during the 1980 survey when<br />

biodegradation rates were higher. Infrared spectroscopy (Perkin Elmer 125 and<br />

225) was also used systematically to show the absence of carbonyl functions on<br />

the FA fractions. .During the 1980 campaign, it appeared that some of the<br />

chromatograms of the FA fractions were not sufficiently resolved due to the<br />

absence of saturated hydrocarbons. However, as they represented a substantial<br />

weight<br />

Cameca)<br />

(A. * 257 g; A,<br />

was used to denote<br />

14 g) , NMR spectroscopy (C 13 and proton 250 Mz<br />

the presence of heavy-weight <strong>com</strong>pounds with fused<br />

103<br />

FB

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