干香菇中二氧化硫的测定的不确定度评定

Uncertainty evaluation of determination of sulfur dioxide in dried shiitake

中文关键词:  干香菇  二氧化硫  不确定度

英文关键词:dried shiitake  sulfur dioxide  uncertainty

中文摘要:

      目的 对干香菇中二氧化硫的测定的不确定度进行评定。方法 依据GB 5009.34-2016对菜市场和超市购买的干香菇进行了二氧化硫含量的测定, 依据JJF 1135-2005建立数学模型, 分析不确定度的来源, 根据来源的不同分类进行各类不确定度的评定和合成。结果 本研究中干香菇中的二氧化硫含量为(0.0610± 0.0013) g/kg, 超过了国标规定的限量标准(95%置信概率, k=2)。结论 测量结果的不确定度主要来源于样品的均匀性和标准溶液的标定及稀释。

英文摘要:

      Objective To evaluate the uncertainty of determination of sulfur dioxide in dried shiitake. Methods Sulfur dioxide content of dried shiitake purchased from vegetable markets and supermarkets was measured according to GB 5009.34-2016. The mathematical model was established according to JJF 1135-2005 to analyze the sources of uncertainty. All kinds of uncertainty were evaluated and synthesized according to different classification of sources. Results The results showed that the sulfur dioxide content in dried shiitake was (0.0610±0.0013) g/kg, which exceeded the national standard limit (95% confidence probability, k=2). Conclusion The uncertainty of the measurement results mainly comes from the uniformity of the sample and the calibration and dilution of the standard solution.