2-(5-溴-2吡啶偶氮)-5-二乙氨基酚显现人体皮肤表面镀锌工具遗留印迹

Chromogenic Detection of Imprints Left by Zinc Coatings on Human Skins by 2-(5-Bromo-2-pyridylazo)-5-(diethylamino) phenol

研究2-(5-溴-2吡啶偶氮)-5-二乙氨基酚(5-Br-PADAP)试剂显现镀锌工具遗留印迹的方法。考察接触时间、时间间隔、试剂浓度、是否洗手等因素对印迹强度及分辨率的影响,并对该方法的可靠性进行验证。实验结果表明,试剂浓度1 g/L、接触时间10 s以上,间隔时间不超过4 h条件下,均能显出较好的印迹。该方法可以灵敏地显现镀锌工具遗留印迹,对非铁金属工具遗留印迹检测进行了很好地补充。

The detection of imprint left by zinc coatings on human skins was studied. The affecting factors such as contact time, time elapse from the contact to the reaction, concentration of 2-（5-bromo-2-pyridylazo）-5-（diethylamino）phenol（5-Br-PADAP） reagent and washing on the intensity and resolution of imprints were studied and the reliability of this method was verified. As shown in experimental results, good imprints can be obtained with a concentration of 1 g/L of 5-Br-PADAP, contact time of 10 s, time elapse of less than 4 h. This method can develop imprints left by zinc coatings sensitively as a good supplement for the detection of imprints left by nonferrous metal tools.