纸吸管中铅、砷、铝元素含量和迁移量变化的规律

Regularity of changes in the content and migration of lead, arsenic, and aluminum elements in paper straws

中文关键词:  纸吸管  元素  含量  迁移量

英文关键词:paper straw  element  content  migration

中文摘要:

      目的 建立电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry, ICP-MS)、电感耦合等离子体光谱法(inductively coupled plasma optical spectrometry, ICP-OES)测定纸吸管中金属元素(铅、砷、铝)含量和迁移量的方法, 并分析3种元素含量和迁移量的变化规律。方法 用微波消解和在4%乙酸中浸没2 h作为前处理条件, 按照选定的仪器工作条件进行上机分析, 绘制标准工作曲线, 对3种元素分别进行加标回收实验, 计算回收率和精密度, 再分别检测45个试样中3种元素的含量和迁移量。结果 ICP-MS方法中铅、砷元素线性范围为5~50 μg/L, 相关系数均大于0.999, 检出限0.005、0.002 mg/kg, 加标回收率为96.1%、104.2%, 相对标准偏差1.5%、3.6%; ICP-OES方法中铝元素的线性范围为0.5~4.0 mg/L, 相关系数大于0.999, 检出限0.3 mg/kg, 加标回收率为94.0%, 相对标准偏差0.2%。纸吸管中铝元素含量和迁移量值均较高, 尤其是铝元素含量, 平均含量为148.00 mg/kg, 最高含量为1005.00 mg/kg, 含量超过100.00 mg/kg的占比40%。结论 本研究根据纸吸管中铅、砷、铝元素含量高低特点, 形成一套测试纸吸管中铅、砷、铝的实验方法, 利用此方法测试样品中铅、砷、铝元素含量和迁移量, 并探讨在实际使用过程中的迁移规律, 可为进一步了解纸吸管安全性提供理论支撑。

英文摘要:

      Objective To establish a method for determination the content and migration of metal elements (lead, arsenic, aluminum) in paper straws by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical spectrometry (ICP-OES), and analyze the changes in the content and migration of 3 kinds of elements. Methods Microwave digestion and immersion in 4% acetic acid for 2 hours were used as pre-treatment conditions. The instrument was analyzed according to the selected working conditions, and a standard working curve was drawn. Three elements were subjected to spiked recovery experiments, and the recovery rate and precision were calculated. Then, the content and migration amount of 3 kinds of elements were detected in 45 samples. Results The linear range of lead and arsenic elements in the ICP-MS method was 5–50 μg/L, with correlation coefficients greater than 0.999 and limits of detection of 0.005 and 0.002 mg/kg. The spiked recovery rates were 96.1% and 104.2%, with relative standard deviations of 1.5% and 3.6%. The linear range of aluminum element in ICP-OES method was 0.5–4.0 mg/L, with a correlation coefficient greater than 0.999 and the limits of detection of 0.3 mg/kg. The spiked recovery rate was 94.0%, with a relative standard deviation of 0.2%. The aluminum content and migration amount in paper straws were relatively high, especially the aluminum content, with an average content of 148.00 mg/kg and a maximum content of 1005.00 mg/kg. The 40% of the straws had a content exceeding 100.00 mg/kg. Conclusion Based on the characteristics of lead, arsenic, and aluminum content in paper straws, this study establishes an analytical method for testing aluminum, lead, and arsenic in paper straws. Based on this method, the content and migration patterns of lead, arsenic and aluminum elements in actual use are explored, providing technical support for a deeper understanding of the safety of paper straws.