Comprehensive Chemical Experiment: Preparation and Application of Basic Dye-Diatomite Composite Powders in Latent Fingermark Development
YUAN Chuan-Jun1,2
1. Department of Trace Examination, Criminal Investigation Police University of China, Shenyang 110035, China;
2. Key Laboratory of Impression Evidence Examination and Identification Technology, Ministry of Public Security, Shenyang 110035, China
Abstract Composite powders for developing latent fingermarks were prepared based on physical absorption between diatomite and basic dyes including methylene blue and safranine T. Morphology and structure of diatomite were characterized by SEM and FTIR, respectively. Adsorption property of diatomite was measured by UV-Vis absorption spectra. Fingermarks on various objects were successfully developed by basic dye-diatomite composite powders. This comprehensive chemical experiment covered a set of areas, including data processing and equipment use in analytical chemistry, surface adsorption mechanism in physical chemistry, and latent fingermark development in forensic science, which would broaden students' horizon and enhance their scientific literacy.
YUAN Chuan-Jun. Comprehensive Chemical Experiment: Preparation and Application of Basic Dye-Diatomite Composite Powders in Latent Fingermark Development[J]. Chinese Journal of Chemical Education, 2019, 40(6): 66-70.
