青海省枸杞中二氧化硫残留量状况分析

Analysis of sulfur dioxide residues in Lycium ruthenicum in Qinghai province

中文关键词:  青海省  枸杞  二氧化硫残留量  检测分析

英文关键词:Qinghai province  Lycium ruthenicum  sulfur dioxide residue  detection and analysis

中文摘要:

      目的 评价青海省枸杞中二氧化硫残留量。方法 依据GB 5009.34-2016采用凯氏定氮仪蒸馏法, 对2019年青海省柴达木盆地的都兰、德令哈和格尔木的枸杞进行二氧化硫含量测定。结果 403份枸杞样品中二氧化硫残留检出率为29.77%, 不合格率为4.71%。86份黑枸杞未检出二氧化硫残留, 317份红枸杞中检出二氧化硫残留120份, 19份红枸杞超出二氧化硫残留限量值。检出二氧化硫残留红枸杞样品中, 都兰检出率为9.57%, 不合格率为0.87%, 德令哈检出率为54.17%, 不合格率为5.21%, 格尔木检出率为53.77%, 不合格率为12.26%。结论 青海省枸杞中二氧化硫残留合格率为95.29%, 处在一个相对安全水平, 但仍然有4.71%样品二氧化硫残留超标, 其中德令哈和格尔木的红枸杞存在较为严重的二氧化硫残留问题。

英文摘要:

      Objective To evaluate the residue of sulfur dioxide in Lycium ruthenicum in Qinghai province. Methods According to GB 5009.34-2016, the sulfur dioxide content of Lycium ruthenicum from Dulan, Delingha and Golmud in Qaidam Basin of Qinghai province in 2019 was determined by Kjeldahl distillation method. Results The detection rate of sulfur dioxide residue in 403 Lycium ruthenicum samples was 29.77%, and the unqualified rate was 4.71%. No sulfur dioxide residue was found in 86 samples of Lycium ruthenicum Murr. In 317 Lycium ruthenicum samples, 120 samples of sulfur dioxide residue were detected, and 19 samples exceeded the limit of national standard. The detection rate of samples of Dulan, Delingha and Golmud were 9.57%, 54.17% and 53.77%, respetively. Furthermore, 0.87%, 5.21%, 12.66% samples of Dulan, Delingha and Golmud exceeded the limit of national standard．Conclusion The qualified rate of sulfur dioxide residue in Lycium ruthenicum in Qinghai province was 95.29%, which is a relatively safe level. Notably, there were still 4.71% samples with sulfur dioxide residue exceeded the limit of national standard. Besides, Lycium barbarum in Delingha and Golmud has a relatively serious problem of sulfur dioxide residue.