Meso-四-(3,5-二溴-4-羟基苯)卟啉光度法检测食品包装材料铅污染  

The Spectrophotometry Detection of the Pollution in Pack Materials for Food with Meso Tetra (3,5 Dibromo 4 Ydroxylphenyl)Porphyrin

作　　者：李在均[1] 虞学俊[1] 朱振中[1] 

机构地区：[1]无锡轻工大学化工系

出　　处：《无锡轻工大学学报（食品与生物技术）》1998年第3期90-92,共3页Journal of Wuxi University of Light Industry

摘　　要：研究了Ｍｅｓｏ－四－（３，５－二溴－４－羟基苯）卟啉［Ｔ（ＤＢＨＰ）Ｐ］与铅的显色反应，建立了一种测定食品包装材料铅污染的分析方法。在０．０８ｍｏｌ／ＬＮａＯＨ介质中，铅与Ｍｅｓｏ－四－（３，５－二溴－４－羟基苯）卟啉形成１２黄色配合物，最大吸收波长为４７９ｎｍ，表观摩尔吸光系数为２．２×１０５．研究表明，体系中加入８－羟基喹啉和盐酸羟胺，既加快了显色反应速度，在常温下放置５ｍｉｎ即可完成，又大大提高测定铅的选择性，能满足复杂体系中痕量铅的测定。A color reaction of lead with T(DBHP)P was studied in detail. The method of detection of the pollution of lead in pack materials for food has been developed. In 0.08 mol/L NaOH medium,lead reacted with T(DBHP)P to form a 1∶2 yellow complex,which has maxium absorption peak at 479 nm, and the apparent molar absorpitivity was found to be 2.2×10 5. The selectivity and reaction rate were improved remarkably because of the presence of oxine and hydroxylamine hydrochloride. The method can be used to determine trace lead in complex samples.

关 键 词：光度法 铅 羟基苯 卟啉 食品包装材料 污染 

分 类 号：TS206[轻工技术与工程—食品科学] TS207.5[轻工技术与工程—食品科学与工程]