GB 5889-1986 in English

VALID

Method of quantitative analysis of ramie chemical components

Issued on:1986-01-21
Implemented on:1986-10-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $120.00
$117.00

Standard No:	GB 5889-1986
Document status:	VALID
Title in English:	Method of quantitative analysis of ramie chemical components
Title in Chinese:	苎麻化学成分定量分析方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	1986-01-21
Implemented on:	1986-10-01
ICS Classification:	59.060.10-Natural fibres
Chinese Classification:	W31-Half finished linen products
Professional Classification:	GB-National Standard
Related Keywords:	method points control accuracy analysis cycle fats ramie chemical components introduction analysis gradient chemical digestion method difference calculation method quantitative analysis
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《GB 5889-1986苎麻化学成分定量分析方法》由TC513（全国纤维标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Introduction

Analysis of the core principles of the method

This standard uses the gradient chemical digestion method to separate the components of ramie step by step: the fat extractor uses a two-phase solvent of benzyl alcohol to extract fat wax, the high-temperature electric furnace system is used for ash testing, and the cellulose content is corrected according to the difference calculation method.

Chemical composition detection system

Detection object	Method points	Control accuracy	Analysis cycle
Fats and waxes	Phenylethanol (2:1) system continuous extraction	±0.02g	3h/sample
Pectin	5g/L ammonium oxalate three-stage boiling	≤0.5ppb	6h/batch

Analysis of standard technology evolution

Compared with the traditional combustion method, the 1988 version adds: ◆ Soxhlet extraction quantitative technology to improve the fat and wax testing process ◆ Introduce sand core filter to optimize the lignin recovery efficiency to 92% ◆ Creatively establish the secondary digestion of residual glue method for dried hemp

Key points of quality control

Implementation case of a hemp spinning factory in Hubei

The production process strictly refers to the requirements of Clause 7.3: ◆ Perform double verification analysis for every 200kg of raw materials ◆ vacuum dryer constant weight operation time is optimized to 45min ◆ The practice of recycling phenylethanol solvent reduces reagent costs by 30%

Key implementation suggestions

Key points for pretreatment: The humidity of hemp samples should be strictly controlled at 10-12% (GB 5883)
Equipment selection: Incremental humidity feedback oven is preferred
Key points for quality control: Each batch of samples should be set up for comparison with NIST standard materials