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Determination of total sulfite in shrimp with rapid steam distillation methods
Vyncke, W. (1993). Determination of total sulfite in shrimp with rapid steam distillation methods. Mededelingen van het Rijksstation voor Zeevisserij (CLO Gent), 234. Rijkscentrum voor Landbouwkundig Onderzoek: Gent. 11 pp.
Part of: Mededelingen van het Rijksstation voor Zeevisserij (CLO Gent). Rijksstation voor Zeevisserij: Oostende. ISSN 0303-9072, more

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Abstract
    The efficiency of two types of steam distillation apparatus viz. a rapid distillation unit (Tecator) and a compact distillation apparatus according to Antonacopoulos vas evaluated, using either iodimetric titration or colorimetric determination with Ellman's reagent. There was no interference from the shrimp matrix. Recoveries of sulfite added to shrimp averaged 99,6% (s = 3,8%) for concentrations of at least 3 µg/g with Tecator and 10 /µg/g with Antonacopoulos. Best results were obtained with Tecator distillation followed by colorimetry with Ellman's reagent. The detection limit was lower (1 vs 3µg/g for titrimetry) and the precision higher (0,2 vs 1 µg/g). The other methods however were still satisfactory, which could be important for laboratories where sulfite is analyzed only sporadically and which do not possess automatic distillation equipment such as Tecator.

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