Abstract:

In this study, the determination of sulfite content in aquatic products was investigated. A nitrogen distillationformaldehyde solution absorption-pararosaniline hydrochloride spectrophotometric method was established through comparing different extraction and determination methods to determine sulfite content in aquatic products. The established method exhibited an excellent linear relationship with correlation coefficient of 0.9993 for sulfur dioxide at the concentration range of 0.1－2.0μg/mL. The recovery rate of this established method was 80%－100% with relative standard deviation of less than 10%. The detection limit of this method was 0.30 mg/kg. Therefore, this developed method is characteristics of good repeatability, less pollution and high recovery rate, which is suitable for the determination of sulfite in aquatic products.

Key words: nitrogen distillation, pararosaniline hydrochloride, aquatic products, formaldehyde solution absorption, sulfite