浓缩柱富集-流动注射分光光度法测定食品接触材料中的微量铅

Spectrophotometric determination of trace lead in food contact materials by concentrated enrichment-flow injection analysis

中文关键词:  流动注射  铅  富集  分光光度法

英文关键词:flow injection analysis  lead  enrichment  spectrophotometry

中文摘要:

      目的 采用低压浓缩柱来富集食品接触材料提取液中的微量铅。方法 铅与甲基百里酚蓝(MTB)螯合显色与流动注射法(FIA)联用, 建立铅的浓缩柱富集-FIA。以MTB为显色剂, 并对显色体系进行了优化。结果 在最佳实验条件下, 该方法在2~90 ?g/L的范围内, 铅质量浓度与峰高成良好线性关系, 相关系数r=0.9991, 相对标准偏差为1.6%(20 ?g/L Pb, n=10), 方法的检出限为0.34 ?g/L。结论 这种低压浓缩柱对溶液中的微量铅具有良好的富集作用, 与FIA联用, 可实现快速在线分析。

英文摘要:

      Objective Using low concentration column to enrich trace lead in food contact materials. Methods Using lead concentration column enrichment-flow injection spectrophotometry (FIA) combined with lead, methyl thymol blue (MTB) chelate color and FIA. Optimized the color system and used MTB as chromogenic rea-gent. Results The linear range of standard solutions was from 2 μg/L to 90 μg/L (correlation coefficient r=0.9991). The relative standard deviation (RSD) was 1.6% (n=10) obtained by injecting standard solution with 50 μg/L lead. The detection limit was 0.34 μg/L. Conclusion This new concentration column is feasible in the enrichment of trace lead from aqueous solutions. It can be used as a fast online analysis method combined with FIA.