硝酸银品位及其对物理显影剂性能影响的验证研究。

Q4 Medicine
Journal of Forensic Identification Pub Date : 2018-01-01
Allison Coppes, Robert S Ramotowski, Brian A Jones, Michael E Manna, Esther V Chervinsky, Kim D Smith
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引用次数: 0

摘要

硝酸银是物理显影剂的重要组成部分。近年来,硝酸银的成本大幅上涨,促使美国特勤局的法医实验室寻找一种更经济的方法来生产物理显影剂。解决这一困境的一个可能的办法是使用低等级的硝酸银,它通常成本较低。本研究比较了三种物理显影液在不同纸张基材上产生的指纹质量,每种显影液分别使用美国化学学会(ACS)、美国药典(USP)或技术等级的硝酸银制备。经确定,纯度较低的硝酸银等级产生的指纹质量与ACS等级大致相同,ACS等级目前在作者的实验室中用于制作PD工作溶液。在比较ACS和USP级硝酸银制备PD的实验中,ACS级只有5%的时间优越,而USP级有27%的时间优越。在对比用ACS和技术级硝酸银制备PD的实验中,ACS级只有10%的时间优于技术级,而17%的时间优于技术级。对于大多数样本比较,没有观察到指纹质量的差异。总的结论是,USP或技术级硝酸银都可以取代目前更昂贵的ACS级硝酸银。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Silver Nitrate Grade and Its Effect on Physical Developer Performance-A Validation Study.

Silver Nitrate Grade and Its Effect on Physical Developer Performance-A Validation Study.

Silver Nitrate Grade and Its Effect on Physical Developer Performance-A Validation Study.

Silver Nitrate Grade and Its Effect on Physical Developer Performance-A Validation Study.

Silver nitrate is a critical component of the physical developer (PD) reagent. Significant increases in the cost of silver nitrate in recent years have caused the United States Secret Service's Forensic Laboratory to look for a more economical way to produce physical developer. One possible solution to this dilemma is to use a lower grade of silver nitrate, which typically has a lower cost. This study compared the quality of fingerprints produced on various paper substrates by three physical developer working solutions, each prepared using either the American Chemical Society (ACS), U.S. Pharmacopeia (USP), or technical grade of silver nitrate. It was determined that the less pure grades of silver nitrate produced approximately the same quality of fingerprints as the ACS grade, which is currently used in the authors' laboratory for making PD working solutions. In the experiments comparing PD prepared using the ACS and USP grades of silver nitrate, the ACS grade was superior only 5% of the time, whereas the USP grade was chosen 27% of the time. In the experiments comparing PD prepared using the ACS and technical grades of silver nitrate, the ACS grade was superior only 10% of the time, whereas the technical grade was selected 17% of the time. For the majority of the sample comparisons, no difference in fingerprint quality was observed. The overall conclusion was that either USP or technical grade silver nitrate can be used in place of the current, and more expensive, ACS grade of silver nitrate.

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来源期刊
Journal of Forensic Identification
Journal of Forensic Identification Medicine-Pathology and Forensic Medicine
CiteScore
1.00
自引率
0.00%
发文量
0
期刊介绍: A scientific journal that provides over 115 pages of articles related to forensics. Such articles are written by either the IAI editor himself, and/or by forensic authorities from around the world employed in forensic science fields. Examples of articles include dispositons of the Daubert Hearings, exhaustive case studies of closed criminal cases, minutes of IAI business meetings, air disaster identification articles, field evidence instructions, crime scene processing covering blood pattern interpretation and latent print identification articles, forensic photography field examples to DNA analysis studies. The JFI also offers information specific about training and educational events, job postings and announcements as well as information about the business of the IAI.
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