GB 5889-1986 Quantitative analysis method for chemical components of ramie
Some standard content:
National Standard of the People's Republic of China
Method of quantitative analysis of ramie chemical componentsUDC 677.151.014
GB5889--86
This standard is a test method for determining the chemical composition content, rubber content and residual rubber content of raw blue hemp (raw hemp) and refined hemp (including oil-free refined hemp), water hemp and oil hemp. All inspections during production, acceptance and delivery shall be conducted in accordance with this standard. Sampling
Perform in accordance with GB5881-86 "Sampling Method for Physical and Chemical Properties of Ramie". 2 Laboratory conditions
Should have heating, water, electricity and other conditions, and necessary safety protection measures and equipment. In case of power outage or water outage during work, it should be noted in the test record.
3 Analysis cycle
3.1. Chemical composition content of raw hemp
Each batch of raw hemp entering the factory shall be analyzed at least once. In case of small batch or urgent need, only the rubber content of raw hemp can be analyzed. 3.2 In principle, the residual rubber rate of refined hemp (including oil-free refined hemp), water hemp and oil hemp shall be analyzed once per shift. In special circumstances, it can be agreed upon by the delivery and acceptance parties. Instruments and Chemicals
4.1 Glass Instruments
Fat Extractor: 250ml Ball Type;
Erlenmeyer Flask: 500ml,
Spherical Condenser: 250ml,
Stopped Erlenmeyer Flask: 50ml;
High Type Weighing Bottle: Φ40mm×70mm;
Glass Vacuum Tube;
Suction Bottle:
1000ml
Glass Sand Core Filter: No33,
White Porcelain Crucible: 30ml;
Glass Dryer: 180, 150mm,
Graduating Cylinder: 250ml.
4.2 Weighing Instruments
Precision Analytical Balance: Sensitivity: 1/10,000 gram; Tray Balance: Sensitivity: 1/10,000 gram.
4.3 Others
Technical parameters
Electric furnace (optional if gas is available): 300Wa.
Published by the National Bureau of Standards on 1986-01-21
Reference model
Sx-4-10
Implemented on 1986-10-01
High temperature electric furnace:
Electric constant temperature water bath:
GB 5889—86
1000℃
37～100℃
Electric constant temperature drying oven: Temperature control range: 50~150℃ Sensitivity: ±1℃
Household refrigerator: 2001
f. Sample sieve: 120 days
4.4 Chemicals
Sodium hydroxide: content not less than 95%, chemically pure: sulfuric acid: content 95-98%, chemically pure,
Ammonium oxalate: content 99.8%, chemically pure;
Benzene: content not less than 99.0%, chemically pure, anhydrous ethanol: chemically pure;
Cyclopentane: content not less than 99.0%, chemically pure. 5 Analysis and calculation methods
5.1 Sample arrangement
Randomly take the hemp samples and make 3 samples each weighing about 5g. 5.2 Determination of moisture content of raw ramie (raw hemp)
See GB5883--86 "Test method for regain and moisture content of ramie". 5.3 Quantitative analysis of chemical components of raw ramie (raw ramie) 5.3.1 Fat wax content
H·H·S11-2 type (second hole)
Y801A type
Put the samples with measured moisture content into fat extractors respectively, and the height of the samples is about 10-15mm below the overflow port. Add 150ml of phenylethanol (volume ratio 2:1) solution into the flask, extract at a constant temperature, and control the reflux rate to 4-6 times/h. Start timing from the beginning of dripping of the extract, and extract for 3h. Take out the sample and air dry it in a fume hood. Then put it into a weighing bottle of known weight and dry it at 105-110℃ to constant weight (the difference between the two weights should not exceed 0.02% of the latter weight. Same below). Take it out and quickly put it in a desiccator to cool for 30±5min, accurately weigh the total weight of the sample and the weighing bottle and record it. Calculate according to formula (1): Wi =
Formula t: W-
-fat wax content of the sample, %3
Go-dry weight of the sample before extracting fat wax (or after measuring water content), g, Gi
-dry weight of the sample after extracting fat wax, g. 5.3.2 Water-soluble content
Put the samples after extracting fat wax into a conical flask with 150ml of distilled water, install a spherical condenser, boil for 1h, replace with new distilled water, boil again for 2h, take out the sample, wash it in a sample sieve. Put it into a weighing bottle of known weight and dry it to constant weight. Take it out, quickly put it in a flat desiccator to cool, weigh it and record it. Calculate according to formula (2):
W2----water-soluble content of the sample, %, G1-G2
G2 ---dry weight of the sample after extracting water-soluble matter, g. 5.3.3 Pectin content
Put the samples after extracting the water-soluble substances into a conical flask with 150ml of 5g/1 ammonium oxalate solution, install a spherical condenser, and boil for 3 hours. Take out, wash in a sample sieve, put in a weighing bottle of known weight, and dry to constant weight. Take out and quickly put in a desiccator to cool, weigh and record.
Calculate according to formula (3):
Wherein: W3
—pectin content of a sample, %;
GB 5889-86
—dry weight of the sample after pectin is extracted, 8. 5.3.4 Hemicellulose content
(3)
Put the samples after pectin is extracted into a conical flask with 150ml of 20g/1 sodium hydroxide solution, install a spherical condenser, boil for 3.5h, take out, wash with a sample sieve, put into a weighing bottle of known weight, dry to constant weight, take out and quickly put in a desiccator to cool, weigh and record.
Calculate according to formula (4):
Wherein: W4-
Hemicellulose content of the sample, %,
G3- G4
-weight of the sample after hemicellulose extraction, g. 5.3.5 Lignin content
(4)
Randomly select 4 to 6 points from the hemp sample, take samples weighing about 5g, extract the wax and air-dry and cut into pieces (length not exceeding 1.5mm), weigh each sample weighing about 1g, a total of 3. Put them in a stoppered conical flask of known weight, dry to constant weight, take out and quickly put in a desiccator to cool, weigh and record. Then slowly add 30ml of 72% sulfuric acid solution. Place at 8-15℃ for 24h. Then, transfer to a conical flask, dilute to 300 ml with distilled water, install a spherical condenser and boil for 1 hour, cool slightly, and filter and wash repeatedly with a glass sand core filter of known weight until the filtrate contains no sulfate ions (tested with 10% barium chloride solution). Remove the glass sand core filter and dry to constant weight, take it out and quickly put it in a flat desiccator to cool, weigh and record. Calculate according to formula (5):
ws=%-%×100
Where: Ws-lignin content of the sample, %G\
-total dry weight of lignin and glass sand core filter of the sample, g; -weight of glass sand core filter, g,
G-total weight of sample and stoppered conical flask, g, G6-
-dry weight of stoppered conical flask, 8.
5.3.6 Cellulose content
According to the measured values of the above components, calculate according to formula (6): W6=100-(Wi+W2+W3+W++Ws)
W6-
--cellulose content of raw hemp,%.
5.4 Analysis method of raw hemp ash content
Randomly make 3 samples (hemp balls) weighing about 1g each, put them into white porcelain crucibles of known weight, and dry them to constant weight. Take them out and quickly put them in a dryer to cool, weigh and record. Then put them in a high-temperature electric furnace and burn them at 575±25℃. Stop the furnace when the ash turns to natural or light gray (usually about 4h). When the furnace temperature drops below 250℃, take them out and put them on an asbestos net to cool for 2-3min, then move them to a dryer to cool, weigh and record. Calculate according to formula (7):
Wherein: W.
Ash content of a sample, %,
Dry weight of a white porcelain crucible, g
G\- G6
G'-G6
GB 5889-86
Total dry weight of the sample and the white porcelain crucible, g,
G\——Total dry weight of the ash content of the sample and the white porcelain crucible, g. 5.5 Analysis method of the rubber content of raw ramie (raw ramie) Randomly divide the ramie sample into 3 samples, each weighing about 5g, and place them in weighing bottles of known weight respectively, and dry them to constant weight. Take them out and quickly cool them in a desiccator, weigh them and record them. Put them in a conical flask with 150ml of 20g/1 sodium hydroxide solution, install a spherical condenser and boil them for 1h, replace the new sodium hydroxide solution, boil them again for 2'h, take out the samples, wash them in the sample sieve, and place them in weighing bottles of known weight and dry them to constant weight. Take them out and quickly cool them in a desiccator, weigh them and record them. Calculate according to formula (8):
Where: Wij-
-rubber content of the sample, %,
-dry weight of the sample, g,
Go- Go'
G6-—dry weight of the sample after measuring the rubber content; g. x.100
5.6 Analysis method of residual gum rate of refined dried hemp, oil-free refined dried hemp and water-based hemp (8)
Randomly divide the hemp samples into 3 samples with a dry weight of about 5 each (refined dried hemp and oily hemp should be defatted first), and put them in weighing bottles of known weight respectively, and dry them to constant weight. Take them out and quickly put them in a desiccator to cool, weigh and record. Then put the samples in a conical flask with 150ml of 20g/1 sodium hydroxide solution, install a spherical condenser and boil for 3h. Take out the samples, wash them in a sample sieve, put them in weighing bottles of known weight respectively, and dry them to constant weight. Take them out and quickly put them in a desiccator to cool, weigh and record.
Calculate according to formula (9):
=Go- G6
The residual rubber rate of a sample, %,
Where: We—
The dry weight of a sample, g
G. ——The dry weight of the sample after extracting the residual rubber, g. 5.7 Rounding of numbers
The numbers are all rounded to the second decimal place. The rounding of numbers shall be carried out in accordance with the rounding rules for numbers (supplements) in Appendix C of GB1.1-81 "General Provisions for the Preparation of Standards in the Guidelines for Standardization Work". 78
Quantitative analysis report
Sample name
Raw ramie
(raw ramie)
Analysis meaning
Moisture content
Moisture regain
Fat and wax
Water-soluble matter
Hemicellulose
Residual ash
Lignin
Cellulose
Average value
A.2 Quantitative analysis record of raw ramie (raw ramie) GB5889--86
Appendix A
Tabular form
(reference)
Ramie quantitative analysis report
Warehouse entry date
Standard deviation coefficient
Raw ramie
(raw ramie)
Water ramie (dry ramie without
oil essence)
Ramie (oil)
Glue content
Moisture content
Residual glue rate
Moisture regain
Oil content
Residual glue rate
Degree of polymerization of cellulose
Laboratory
Laboratory number
Mean value
Standard deviation coefficient
Sampling date
Dry weight after test
Bottle weight, 8
Total weight,
Sample weight, g
Bottle weight, g
Total weight, g
Sample weight, g
Same number
Ten
Bottle weight after test, 8
Total weight, name
Sample weight, g
Bottle weight,
Total weight, 8
Sample weight, g
Sample weight
Weight before test
Weight after test
Bottle weight, g
Total weight, 8
Sample weight, g
Bottle weight, 8
Total weight, g
Sample weight, 8
Calculated value
Moisture content, %
GB5889—86
Quantitative analysis record of raw ramie (raw ramie)
Standard deviation coefficient
Pectin, %
Standard deviation coefficient
Cellulose, %
Standard deviation coefficient
CVn- l
Fat wax, %
Standard deviation coefficient
Hemicellulose, %
Standard deviation coefficient
Chemistry laboratory number
Warehouse entry date
Water-soluble matter, %
Standard deviation coefficient
Lignin, %
Standard deviation coefficient
GB5889-86
A.3 Raw ramie (raw ramie), water ramie, oil ramie, refined ramie Quantitative analysis record of dried hemp (including oil-free refined dried hemp) Quantitative analysis record of raw ramie (raw hemp), water hemp, oil hemp, refined dried hemp (including oil-free refined dried hemp) Sampling date
Before test Weight
Dry weight after test
Bottle weight, g
Total weight, 8
Sample weight, g
Bottle weight, g
Total weight, g
Sample weight, g
Dry weight after test
Before Dry weight
Weight after test
Bottle weight,
Total weight, g
Sample weight, g
Bottle weight, g
Total weight, g
Sample weight, g
Sample number
Bottle weight, 8
Total weight, 8
Sample, name
Bottle weight, g
Total weight, 8
Sample weight, g
Let the calculated value|| tt||Raw ramie (raw ramie) rubber content, %
Standard deviation coefficient
Residual rubber content of water-based ramie, %
Standard deviation coefficient
Residual rubber content of dried ramie, %
Standard deviation coefficient
Laboratory number
Ash salt content of raw ramie (raw ramie), %
Standard deviation coefficient
Moisture regain of dried ramie, %
Standard deviation coefficient
cy n-1
Warehouse entry date
Moisture content of water-based ramie, %
Standard deviation coefficient
Oil content of dried ramie, %
Standard deviation coefficient
Additional notes:
GB588986
This standard is proposed by the Ministry of Textile Industry of the People's Republic of China and is under the jurisdiction of the Standardization Research Institute of the Ministry of Textile Industry. This standard was drafted by East China Textile Institute, and was jointly drafted by Zhuzhou Mang Ma Textile Printing and Dyeing Factory and Shanghai No. 9 Cotton Textile Factory. The main drafters of this standard are Jiang Fanchang and Shao Kuan.1-81 "General provisions for the preparation of standards in the guidelines for standardization work" Appendix C digital rounding rules (supplement). 78
Quantitative analysis report
Sample name
Raw ramie
(raw ramie)
Analysis meaning
Moisture content
Moisture regain
Fats and waxes
Water-soluble matter
Hemicellulose
Residual ash
Lignin
Cellulose
Average value
A.2 Raw ramie (raw ramie) quantitative analysis record GB5889--86
Appendix A
Tabular form
(reference)
Ramie quantitative analysis report
Warehouse entry date
Standard deviation coefficient
Raw ramie
(raw ramie)
Water ramie (dry ramie without
oil essence)
Ramie (oil)
Glue content
Moisture content
Residual glue rate
Moisture regain
Oil content
Residual glue rate
Degree of polymerization of cellulose
Laboratory
Laboratory number
Mean value
Standard deviation coefficient
Sampling date
Dry weight after test
Bottle weight, 8
Total weight,
Sample weight, g
Bottle weight, g
Total weight, g
Sample weight, g
Same number
Ten
Bottle weight after test, 8
Total weight, name
Sample weight, g
Bottle weight,
Total weight, 8
Sample weight, g
Sample weight
Weight before test
Weight after test
Bottle weight, g
Total weight, 8
Sample weight, g
Bottle weight, 8
Total weight, g
Sample weight, 8
Calculated valuewww.bzxz.net
Moisture content, %
GB5889—86
Quantitative analysis record of raw ramie (raw ramie)
Standard deviation coefficient
Pectin, %
Standard deviation coefficient
Cellulose, %
Standard deviation coefficient
CVn- l
Fat wax, %
Standard deviation coefficient
Hemicellulose, %
Standard deviation coefficient
Chemistry laboratory number
Warehouse entry date
Water-soluble matter, %
Standard deviation coefficient
Lignin, %
Standard deviation coefficient
GB5889-86
A.3 Raw ramie (raw ramie), water ramie, oil ramie, refined ramie Quantitative analysis record of dried hemp (including oil-free refined dried hemp) Quantitative analysis record of raw ramie (raw hemp), water hemp, oil hemp, refined dried hemp (including oil-free refined dried hemp) Sampling date
Before test Weight
Dry weight after test
Bottle weight, g
Total weight, 8
Sample weight, g
Bottle weight, g
Total weight, g
Sample weight, g
Dry weight after test
Before Dry weight
Weight after test
Bottle weight,
Total weight, g
Sample weight, g
Bottle weight, g
Total weight, g
Sample weight, g
Sample number
Bottle weight, 8
Total weight, 8
Sample, name
Bottle weight, g
Total weight, 8
Sample weight, g
Let the calculated value|| tt||Raw ramie (raw ramie) rubber content, %
Standard deviation coefficient
Residual rubber content of water-based ramie, %
Standard deviation coefficient
Residual rubber content of dried ramie, %
Standard deviation coefficient
Laboratory number
Ash salt content of raw ramie (raw ramie), %
Standard deviation coefficient
Moisture regain of dried ramie, %
Standard deviation coefficient
cy n-1
Warehouse entry date
Moisture content of water-based ramie, %
Standard deviation coefficient
Oil content of dried ramie, %
Standard deviation coefficient
Additional notes:
GB588986
This standard is proposed by the Ministry of Textile Industry of the People's Republic of China and is under the jurisdiction of the Standardization Research Institute of the Ministry of Textile Industry. This standard was drafted by East China Textile Institute, and was jointly drafted by Zhuzhou Mang Ma Textile Printing and Dyeing Factory and Shanghai No. 9 Cotton Textile Factory. The main drafters of this standard are Jiang Fanchang and Shao Kuan.1-81 "General provisions for the preparation of standards in the guidelines for standardization work" Appendix C digital rounding rules (supplement). 78
Quantitative analysis report
Sample name
Raw ramie
(raw ramie)
Analysis meaning
Moisture content
Moisture regain
Fats and waxes
Water-soluble matter
Hemicellulose
Residual ash
Lignin
Cellulose
Average value
A.2 Raw ramie (raw ramie) quantitative analysis record GB5889--86
Appendix A
Tabular form
(reference)
Ramie quantitative analysis report
Warehouse entry date
Standard deviation coefficient
Raw ramie
(raw ramie)
Water ramie (dry ramie without
oil essence)
Ramie (oil)
Glue content
Moisture content
Residual glue rate
Moisture regain
Oil content
Residual glue rate
Degree of polymerization of cellulose
Laboratory
Laboratory number
Mean value
Standard deviation coefficient
Sampling date
Dry weight after test
Bottle weight, 8
Total weight,
Sample weight, g
Bottle weight, g
Total weight, g
Sample weight, g
Same number
Ten
Bottle weight after test, 8
Total weight, name
Sample weight, g
Bottle weight,
Total weight, 8
Sample weight, g
Sample weight
Weight before test
Weight after test
Bottle weight, g
Total weight, 8
Sample weight, g
Bottle weight, 8
Total weight, g
Sample weight, 8
Calculated value
Moisture content, %
GB5889—86
Quantitative analysis record of raw ramie (raw ramie)
Standard deviation coefficient
Pectin, %
Standard deviation coefficient
Cellulose, %
Standard deviation coefficient
CVn- l
Fat wax, %
Standard deviation coefficient
Hemicellulose, %
Standard deviation coefficient
Chemistry laboratory number
Warehouse entry date
Water-soluble matter, %
Standard deviation coefficient
Lignin, %
Standard deviation coefficient
GB5889-86
A.3 Raw ramie (raw ramie), water ramie, oil ramie, refined ramie Quantitative analysis record of dried hemp (including oil-free refined dried hemp) Quantitative analysis record of raw ramie (raw hemp), water hemp, oil hemp, refined dried hemp (including oil-free refined dried hemp) Sampling date
Before test Weight
Dry weight after test
Bottle weight, g
Total weight, 8
Sample weight, g
Bottle weight, g
Total weight, g
Sample weight, g
Dry weight after test
Before Dry weight
Weight after test
Bottle weight,
Total weight, g
Sample weight, g
Bottle weight, g
Total weight, g
Sample weight, g
Sample number
Bottle weight, 8
Total weight, 8
Sample, name
Bottle weight, g
Total weight, 8
Sample weight, g
Let the calculated value|| tt||Raw ramie (raw ramie) rubber content, %
Standard deviation coefficient
Residual rubber content of water-based ramie, %
Standard deviation coefficient
Residual rubber content of dried ramie, %
Standard deviation coefficient
Laboratory number
Ash salt content of raw ramie (raw ramie), %
Standard deviation coefficient
Moisture regain of dried ramie, %
Standard deviation coefficient
cy n-1
Warehouse entry date
Moisture content of water-based ramie, %
Standard deviation coefficient
Oil content of dried ramie, %
Standard deviation coefficient
Additional notes:
GB588986
This standard is proposed by the Ministry of Textile Industry of the People's Republic of China and is under the jurisdiction of the Standardization Research Institute of the Ministry of Textile Industry. This standard was drafted by East China Textile Institute, and was jointly drafted by Zhuzhou Mang Ma Textile Printing and Dyeing Factory and Shanghai No. 9 Cotton Textile Factory. The main drafters of this standard are Jiang Fanchang and Shao Kuan.
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