文章摘要
李瑶佳.石墨炉原子吸收法测定黄花石莲中痕量铅铬[J].西昌学院学报(自然科学版),2019,33(1):13-15.
石墨炉原子吸收法测定黄花石莲中痕量铅铬
Determination of Trace Lead and Chromium in Sinocrassulaindica Var. Luteorubraby Graphite Furnace Atomic Absorption Method
  
DOI:
中文关键词: 石墨炉原子吸收  基体改性剂  黄花石莲    
英文关键词: graphite furnace atomic absorption  matrix modifier  Sinocrassulaindica var. Luteorubra  lead  chromium
基金项目:四川省教育厅资助项目(18ZB0542)
作者单位
李瑶佳 西昌学院农业科学学院四川 西昌 615013 
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中文摘要:
      [目的]建立石墨炉原子吸收测定黄花石莲中铅铬质量分数的方法。[方法]选择磷酸二氢铵作为基体改性剂,在设定的仪 器工作条件下,对黄花石莲茎叶茎花中的铅铬质量分数进行了测定。[结果]铅和铬元素的线性范围分别为0~100 μg/L(r= 0.999 1)和 0~30 μg/L(r=0.998 9),检出限分别为0.157 μg/L和0.336 μg/L。精密度在10.07%~11.54%范围内,加标回收率在 81.6%~92.4%范围内。黄花石莲花中铅和铬质量分数以及叶中铅的质量分数均未超过食品中污染物限量标准(Pb<5 mg/kg, Cr<2 mg/kg),茎中铅和铬质量分数以及叶中的铬质量分数超过国家规定标准值。植株中铅质量分数分布为:茎>花>叶;铬 质量分数分布为:茎>叶>花。[结论]该方法灵敏度高,检出限低,测定结果准确,可用于黄花石莲中铅和铬元素的分析。
英文摘要:
      [Objective] To develop a method of determining trace lead and chromium in Sinocrassulaindica var. Luteorubra through graphite furnace atomic absorption. [Method] Using ammoniumdi hydrogen phosphate as matrix modifier to determine lead and chromium contents in Sinocrassulaindica var. Luteorubra under the given working conditions of instrument. [Results] The lead was in the linear range of 0-100 μg/L(r=0.999 1) and the chromium in the range of 0-30 μg/L(r=0.998 9). The detection limit was 0.157 μg/L with lead and 0.336 μg/L with chromium. The precision was in the range of 10.07%-11.54%, and the recovery was in the range of 81.6%-92.4%. Lead and chromium contents in flower and lead content in leaves were lower than the set limits on food contaminants (Pb<5 mg/ kg, Cr<2 mg/kg),but lead and chromium contents in stems and chromium content in leaves exceeded the values set by the government. Lead content in Sinocrassulaindica var. Luteorubra followed a order of stem>flower>leaf, and chromium content followed a order of stem>leaf>flower. [Conclusion] The method can be used for the determination of trace lead and chromium in Sinocrassulaindica var. Luteorubra with high sensitivity, low detection limit, and high precision.
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