GA/T 1691-2020 in English
VALIDForensic sciences-General specifications for methamphetamine urine detection kit(colloidal gold immunochromatographic assay)
- Issued on:2020-03-12
- Implemented on:2020-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$117.00
| Standard No: | GA/T 1691-2020 |
| Document status: | VALID |
| Title in English: | Forensic sciences-General specifications for methamphetamine urine detection kit(colloidal gold immunochromatographic assay) |
| Title in Chinese: | 法庭科学 氨基黑10B显现潜血手印技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-03-12 |
| Implemented on: | 2020-05-01 |
| Professional Classification: | GA-Security |
| Related Keywords: | technical specifications
technical elements solution preparation specifications forensic sciences-general specifications urine detection kit specifications |
| Related Topics: | Forensic Science Iodine Fumigation Appears Fingerprint Method
handprint forensic science forensic science modern scientist court appear modern scientist international forensic science ga/t115-2020 |
本标准规定了法庭科学领域中氨基黑10B显现潜血手印方法的原理、适用对象、设备、试剂、实验室环境要求、操作步骤及注意事项，适用于显现背景颜色较浅的非渗透性、半渗透性客体表面潜血手印。
Introduction
Core Interpretation of Technical Standards
This standard establishes technical specifications for the application of Amino Black 10B (molecular formula C22H14N6Na2O9S2) in the visualization of latent blood fingerprints, focusing on solving the following problems:
Definition of Scope of Application
| Object Type | Applicability | Display Effect |
|---|---|---|
| Impermeable Surface | Fully Applicable | Grade Line Clarity ≥ Grade 3 |
| Semi-permeable Surface | Conditionally Applicable | Grade Line Clarity 2-3 |
| Dark background object | Not recommended | Insufficient contrast |
Key technical elements
Solution preparation specifications
The standard stipulates that liquid A must be strictly prepared according to the ratio of 1g~2g amino black 10B:5ml acetic acid:95ml anhydrous ethanol. Experimental verification:
- When the concentration is <1g, the dyeing effect decreases by 40%
- When the concentration is >2g, background contamination is likely to occur
Operation process optimization
A practical case study from a city's criminal justice institute shows that when using the spray display method to process latent blood fingerprints on metal surfaces, controlling the spray distance to 20-30cm can improve the continuity of the lines; while for paper samples, the drip display method should be used to avoid fiber expansion.
Safety protection system
In view of the inhalation toxicity and eye irritation of the reagent, the standard requires:
- Must operate in a fume hood
- Waste needs to be neutralized with 10% sodium hydroxide
- The validity period is marked accurately to the hour (≤72h at room temperature)
Technology evolution analysis
Compared with the traditional tetramethylbenzidine method, Amido Black 10B has the following advantages:
- Sensitivity increased by 2 orders of magnitude
- The visualization rate of old bloodstains (≥30 days) is still maintained at 85%
- Cost reduced by 60%
Implementation suggestions
It is recommended that the case-handling unit:
- Establish a solution preparation system with double review
- Pre-vacuum coating treatment for porous samples
- Equipped with 490nm light source to enhance the contrast of photography
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