01 June 2006, Volume 0 Issue 3

    

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  Elemental analysis of paper by WDXRF

  ZHANG Junjing,GUO Hongling, YAN Weitian, et al

  Forensic Science And Technology. 2006, 0(3): 3.

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  Paper is frequently encountered to forensic scientists in both criminal and civil cases. In our work, 6 types of paper, including newspaper, filter paper, ink jet paper (photo quality), photo paper, carbon paper without carbon and printing paper were investigated. 21 brands printing paper and 4 samples of one brand made at different time were studied. The technique used was Wavelength Dispersive Xray Fluorescence (WDXRF). The results showed that it is easy to distinguish the types of paper by qualitative and quantitative analysis. In terms of different printing paper, the concentrations of the elements Na、Mg、Al、Si、Cl、Ca vary from each other, and it is useful to discriminate them. But this XRF method can't differentiate one brand of paper made at different time. 
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  Selection of experiment conditions for identifying red permeating stampink types by HPLC

  WANG Chunhao, ZHANG Zhenyu, ZHU Yu, et al.

  Forensic Science And Technology. 2006, 0(3): 8.

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  Objective To ascertain the experiment condition for analysis of red permeating stampink traces by HPLC. Method The extractor, extraction time, paper influence, detection wavelength and mobile phase were tested. Result The chromatograms and the data of quantitative analysis were attained. Conclusion The appropriate experiment conditions were attained.
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  Effect of hair on the distribution of gunshot residue particles

  CHEN Guanghua, ZHANG Mingju,JIANG Xuemei, et al

  Forensic Science And Technology. 2006, 0(3): 11.

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  In the case of shooting to the head, the deposition of gunshot residue can be shielded by the hair, especially in the case of press closed shooting (about2—5cm). There is no visible gunshot residue on hair-covered scalp because the hair adhere most of the residue. This article will expatiate the effect of hair on the deposition of closed gunshot residue based on experiment and some ture crime cases.
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  The determination of starch /glucose/sucrose in heroin by FTIR

  LIU Shihai; WANG Jian; FENG Jimin

  Forensic Science And Technology. 2006, 0(3): 14.

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  Objective To establish a method for the determination of starch /glucose/sucrose in heroin. Method The samples of heroin mixed with starch, glucose and sucrose were analyzed by FTIR. Result Starch/glucose/sucrose in heroin have been detected. Conclusion FTIR can be used to identify starch /glucose/sucrose in heroin.
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  Determination of CR

  LIU Xianping,QIAO Jing

  Forensic Science And Technology. 2006, 0(3): 18.

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  Objective To introduce the physical and chemistry properties of CR in brief and its determination method. Method Use the direct extraction method to extract sample,then the sample was qualitatively analyzed by TLC and GC/MS,the Rf in different developing systems and the characteristic mass spectra were taken as the basis of qualitative analysis.Result CR were determined by TLC and GC/MS analysis.〖WTHZ〗Conclusion This method is simple, credible, sensitive and proved to be suitable for application in forensic field.
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  Application of 9 canineSTR loci analysis in canine inentifictaion

  HU Meng,YE Jian, JIANG Chengtao, et al

  Forensic Science And Technology. 2006, 0(3): 20.

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  Objective To establish a canine multiplex system for individual discrimination and paternity identification. Method The canine multiplex system were used for PCR reaction and the product were analyzed by ABI310 genetic analyzer.Result The each of 9 canineSTR loci is balance and stable. Conclusion The 9 canineSTR loci multiplex system are suitable for individual discrimination and paternity identification.
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  The marks on the concave surface key

  GAO Lin, BAN Maosen

  Forensic Science And Technology. 2006, 0(3): 23.

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  Objective To analyze the marks on the concave surface key. Method Samples of manipulated keys and keys that used as guide in a duplication process are made. Marks and striations on the keys are photographed and analyzed by light microscopy. Result There are distinctive marks on concave keys when normally used and when used as guide keys. Conclusion The examination of a concave key can reveal distinctive marks whether the key has been used as a guide to create another key.