三种方法测定水产品中亚硫酸盐残留量比较分析

Comparation on sulfite residue in aquatic products by three different methods

通过3种方法对水产品中亚硫酸盐残留量(以二氧化硫计)进行测定,比较测定方法的有效性与差异。采用比色法(盐酸副玫瑰苯胺法)、蒸馏-碘滴定法、离子色谱法对水产品中的亚硫酸盐进行测定,运用统计学手段对结果进行分析。结果表明,3种方法的最低定量限、重复性试验结果均满足要求,蒸馏-碘滴定法回收率结果较低。配对t检验发现3种方法测定的亚硫酸盐残留量相关性显著,离子色谱法与比色法的测定样品结果无明显差异(P>0.05),具有较好一致性,可作为一种替代的检测方法,用于水产品中亚硫酸盐残留量的控制。

To determine sulfite residue（sulfur dioxide） in aquatic products by 3 methods and analyze the availability and difference of the 3 methods.The amounts of sulfite residue in aquatic products were determined by different methods including paraosaniline hydrochloride spectrophotometry（colorimetric method）,distilling iodine titration and ion chromatography.The results showed that determination limit and repeatability met the requirements while the recovery in distilling iodine titration was lower than the others.The data of testing were conducted by t paired samples test in SPSS statistic.The correlations among three methods were heavier and no significant difference（P0.05） was found between ion chromatography and colorimetric method.It indicated that ion chromatography may be used as an alternative method to control the sulfite residue in aquatic products.