GA/T 1680-2019 English PDF

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GA/T 1680-2019: Forensic sciences--Methods for enhancing dust impressions by bromocresol green
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GA/T 1680-2019	139	Add to Cart	3 days	Forensic sciences--Methods for enhancing dust impressions by bromocresol green	Valid

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Basic data

Standard ID: GA/T 1680-2019 (GA/T1680-2019)
Description (Translated English): Forensic sciences--Methods for enhancing dust impressions by bromocresol green
Sector / Industry: Public Security (Police) Industry Standard (Recommended)
Classification of Chinese Standard: A92
Classification of International Standard: 13.310
Word Count Estimation: 6,649
Date of Issue: 2019
Date of Implementation: 2019-12-01
Issuing agency(ies): Ministry of Public Security

GA/T 1680-2019: Forensic sciences--Methods for enhancing dust impressions by bromocresol green

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Forensic sciences--Methods for enhancing dust impressions by bromocresol green ICS 13.310 A92 Public Safety Industry Standards of the People's Republic of China Forensic science plane dust trace bromocresol blue enhancement method Published on October 14,.2019 2019-12-01 Implementation Issued by the Ministry of Public Security of the People's Republic of China

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. Please note that some content of this document may involve patents. Publication of this document The institution does not assume responsibility for identifying these patents. This standard was proposed by the National Criminal Technology Standardization Technical Committee Trace Inspection Sub-Committee (SAC/TC179/SC9) and Be in charge. This standard was drafted by. School of Criminal Science and Technology of the People's Public Security University of China, Tibet Higher Police Academy, and the Ministry of Public Security. center. The main drafters of this standard. Guo Wei, Liu Jin, Luo Yaping, Chen Ruili, Lu Xilong, Nima, Wang Yan. Forensic science plane dust trace bromocresol blue enhancement method

1 Scope

This standard specifies the principles, reagents and equipment, operating procedures, and precautions of bromocresol blue enhanced plane dust traces in the field of forensic science. This standard applies to the enhanced treatment before the extraction of flat dust traces on objects such as natural wood and floor leather in the field of forensic science.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document. GA/T 582 On-site photography method rules

3 Principle

Bromocresol blue is an acid-base indicator. The calcium carbonate in the dust is alkaline after hydrolysis, and it changes color after reacting with bromocresol blue, which can enhance the gray The contrast between the dust trace and the background shows the dust trace.

4 Reagents and equipment

4.1 Reagent The following reagents are chemically pure. a) Bromocresol blue; b) absolute ethanol; c) Deionized water. 4.2 Equipment sprayer. The spray parts of the sprayer should be resistant to acids and alkalis.

5 Operation steps

5.1 Preparation of solution 5.1.1 Prepare a solution with a volume ratio of absolute ethanol to deionized water of 99.1. 5.1.2 Dissolve bromocresol blue in the above solution to prepare a bromocresol blue ethanol solution with a mass volume concentration of 1%. 5.2 Appearance Use a sprayer to spray the bromocresol blue ethanol solution evenly on the surface of the bearing body until a blue mark appears. 5.3 Fixed photo After the traces of dust show up, take photos in accordance with the requirements of GA/T 582 and fix it in time. ......

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