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Citation: XING Zhuo, YANG Ruiqin. Chromogenic Detection of Imprints Left by Zinc Coatings on Human Skins by 2-(5-Bromo-2-pyridylazo)-5-(diethylamino) phenol[J]. Chinese Journal of Applied Chemistry, ;2015, 32(9): 1093-1098. doi: 10.11944/j.issn.1000-0518.2015.09.150033 shu

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

XING Zhuo ,
YANG Ruiqin ^,

1.
School of Forensic Science, People's Public Security University of China, Beijing 100038, China

Corresponding author: YANG Ruiqin,
Received Date: 27 January 2015
Available Online: 16 March 2015
Fund Project: 中央高校基本科研业务费(2015JKF01230) (2015JKF01230)

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.
- forensic science,
- (bromo-pyridylazo)-(diethylamino) phenol,
- imprints left by zinc coatings,
- chromogenic detection
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