非渗透性客体上金属印痕的显现  

Detection of Metal Imprints on Non-porous Surfaces

作　　者：卢思佳 邢卓 杨瑞琴[1] LU Si-Jia;XING Zhuo;YANG Rui-Qin(School of Forensic Science,People's Public Security University of China,Beijing 100038,China;School of Policing Studies,Shanghai University of Political Science and Law,Shanghai 201701,China)

机构地区：[1]中国人民公安大学侦查与刑事科学技术学院,北京100083 [2]上海政法学院警务学院,上海201701

出　　处：《应用化学》2021年第1期116-122,共7页Chinese Journal of Applied Chemistry

基　　金：中国人民公安大学2020年度拔尖创新人才培养项目(No.2020ssky006);刘耀院士专项资助项目(No.2019-ZY-01)。

摘　　要：利用2-(5-溴-2吡啶偶氮)-5-二乙氨基酚显色剂,研究非渗透性客体上金属印痕的显现。考察接触和间隔时间、客体种类和转移次数对显现效果的影响。结果表明,皮肤接触金属工具90 s后,与非渗透性客体接触超过1 s,间隔时间在1~30 d内,转移5次以内时,客体表面遗留印痕均可有效显现。该方法可用以建立起犯罪嫌疑人与金属工具的联系,灵敏简便,在法庭科学领域有较好的应用前景。A new method of visualizing metal imprints on non-porous surfaces was studied using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol as the chromogenic reagent.The affecting factors such as contact time,time elapse from the contact to the reaction,type of substrates and transfer times were studied.The results show that imprints with good quality are obtained when the contact time is more than 1 s,the time interval is between 1~30 days and the metal imprints within 5 deposition times after the contact between hands and metal tools for 90 s.This method has the advantages of high sensitivity and easy operation and is used to establish the connection between suspects and metal tools,which has potential applications in forensic science.

关 键 词：非渗透性客体 金属印痕 离子转移 法庭科学 

分 类 号：O641.4[理学—物理化学]