全自动流动注射分析法测定塑料颗粒中的六价铬  

Determination of Hexavalent Chromium in Plastic Particles by Automatic Flow Injection Analyzer

作　　者：杨东奇 亓红英 郝红叶 武素茹 徐亮 YANG Dong-Qi;QI Hong-Ying;HAO Hong-Ye;WU Su-Ru;XU Liang(Minerals and Metallic Materials Inspection Centre of Tianjin Customs,Tianjin 300450)

机构地区：[1]天津海关化矿金属材料检测中心,天津300450

出　　处：《中国口岸科学技术》2024年第7期74-79,共6页China Port Science and Technology

摘　　要：六价铬[Cr(Ⅵ)]是一种有害元素,采用全自动流动注射分析法可以更好地测定塑料颗粒中的六价铬。此法依据二苯碳酰二肼与六价铬在酸性介质中反应生成紫红色产物,其可以在550 nm波长下被测量。与传统紫外可见分光光度法相比,全自动流动注射分析法省去了手动显色过程,自动化程度高,具有快速、灵敏、高效的特点。塑料颗粒经过浸提后呈现的颜色对测试结果有干扰,而C_(18)柱可以作为脱色的首选材料,既对基质颜色有很好的吸附作用,又不会对六价铬产生吸收。综合实验结果,本方法适用于塑料颗粒六价铬含量的检测。Hexavalent chromium[Cr(Ⅵ)]is a harmful element,and its determination in plastic particles can be more effectively conducted using a fully automated flow injection analysis method.This method is based on the reaction between diphenylcarbazide and hexavalent chromium in an acidic medium,which produces an amaranth product that can be measured at a wavelength of 550 nm.Compared with the traditional UV-VIS spectrophotometry,the automatic flow injection analyzer eliminates the manual color development process,and offers high automation,rapidity,sensitivity and efficiency.The color presented by the plastic particles after extraction can interfere with the test results,and C_(18) columns can be used as the preferred material for decolorization,which has a good adsorption effect on matrix color without absorption of hexavalent chromium.Based on the experimental results,the method is suitable for the determination of hexavalent chromium content in plastic particles.

关 键 词：六价铬 流动注射 塑料 脱色 检测 

分 类 号：TQ320.77[化学工程—合成树脂塑料工业]