Some standard content:
GB17602—1998
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Preface
This standard is not equivalent to the American Society for Testing and Materials standard ASTMD1836--1991 (1994). The key differences between this standard and the ASTM D1836-1991 (1994) standard are: 1. The aniline point indicator is cancelled.
2. Convert specific gravity (15.6/15.6℃) to density at 20℃. 3. The kauri butanol value indicator is tentatively designated as "report". 4. The dry point is set to not be higher than 71℃.
5. The two items of odor and kauri butanol value, in addition to being used as a solvent for vegetable oil extraction, can implement the agreement indicators. Appendix A, Appendix B and Appendix C in this standard are appendices to the standard. This standard was proposed by China Petrochemical Corporation. This standard is under the jurisdiction of China Petrochemical Corporation Petrochemical Science Research Institute. This standard was drafted by: Petrochemical Research Institute of China Petroleum & Chemical Corporation. The main drafters of this standard are: Wang Fei and Lu Qiping. 215
1 Scope
National Standard of the People's Republic of China
Industrial hexanes
Commercial hexanes
This standard specifies the technical conditions for industrial hexanes. GB 17602— 1998 | | tt | solvent for the extraction process. This standard covers certain hazardous materials, operations and equipment, but it is not intended to make recommendations on all safety issues related thereto. Therefore, users should establish appropriate safety and protective measures and determine an appropriate management system before using this standard. 2 Referenced standards
The provisions contained in the following standards become part of this standard by reference. Unless otherwise expressly stated in the standard, the following referenced standards shall be currently valid standards.
GB/T 1884
GB/T 1885
GB/T 3143
GB/T 3555
Determination of density of petroleum and liquid petroleum products ( Density meter method) Petroleum meter
Liquid chemical product color determination method (Hazen unit platinum-diamond color number) Petroleum product Saybolt color determination method (Saybolt colorimeter method) Petroleum liquid manual sampling method | |tt||GB/T 4756
: Determination of butanol value of kauri resin as a hydrocarbon solvent GB/T 11134
GB/T 11136
GB/T 17474||tt| | Determination of bromine index of petroleum hydrocarbons (potentiometric titration) Determination of benzene content in hydrocarbon solvents (gas chromatography) SH0164 Petroleum product packaging, storage, transportation and delivery acceptance rules SH/T0253 Determination of total sulfur content in light petroleum products Method (electricity method) 3 technical requirements
Industrial hexane should meet the requirements specified in Table 1. Table 1 Industrial hexane technical requirements
item
density (20C), kg/m2
odor! "
[kauri butanol value"
bromine index
mesh
color (meeting one of the following two indicators): Saibo special number
Platinum-cobalt color number
not greater than
not less than
not greater than
approved by the State Bureau of Quality and Technical Supervision on 1998-12-08 216
quality index
655~681
No residual odor
Report
1000
+28
10
Test method|| tt||GB/T 1884 and GB/T1885
Appendix A
GB/T11134
GB/T11136
GB/T 35552
GB/ T3143
Implemented on 1999-05-01
Distillation range
Initial boiling point, ℃
Dry point, ℃
Sulfur content, mg/kg| |tt||item
non-volatile matter, mg/100 mL
benzene content, %(m/m)
item
not less than||tt| |Not higher thanWww.bzxZ.net
Not greater than
Not greater than
Not greater than
GB 17602--1998
Table 1 (End)
Quality index
63
: 71
10
1
0.1
1) In addition to being used as a vegetable oil extraction solvent, it can also Execution protocol indicators. 2) When there is a dispute, the method is arbitration. Packaging, marking, transportation, storage
4
Appendix B
Test method
SH/T 0253
Appendix C
GB/ T17474
Packaging, marking, transportation, storage and delivery acceptance shall be carried out in accordance with SH0164, but when it is used as a solvent for vegetable oil extraction, it should be stored and transported in special containers.
5 Sampling
Sampling shall be carried out according to GB/T4756, and 2L shall be taken for inspection and retention. 217
A1 scope
GB 17602—1998
Appendix A
(Standard appendix)
Odor determination method for volatile solvents and diluents A1. 1 This test method determines the acceptability of odors in volatile organic solvents and diluents in solvent systems by examining their characteristics and residual odors.
A1.2 This test method is not suitable for measuring subtle odor differences and odor intensity between substances. A1.3 It is recommended that this method is not suitable for determining the residual odor of liquids that have been evaporated to dryness at room temperature for more than 30 minutes. A2 Reference Standard
The odor characteristics of the specific test product sample shall meet the requirements of the buyer and manufacturer. A3 meaning and use
A3.1 By comparing odor characteristics and combining with other detection methods, product inspection and evaluation can be carried out according to specification requirements. A3.2 The residual odor characteristics can be used to determine the presence of relatively non-volatile substances, which may be related to production and the distribution of pollutants. Since volatile solvents and diluents are used in many types of chemical processes, and their residues can affect the production efficiency of these processes, this method is a comparative test method provided for production control and evaluation based on specification requirements. A4 Hazards
A4.1 Many solvents and diluents, such as aromatic hydrocarbons and aliphatic hydrocarbons, are toxic or harmful. Some special precautions should be taken when determining the odor of these substances. Experiments should be conducted as often as necessary with necessary controls, evaluated on the basis of brief sleep, and as little vapor inhalation as possible.
A4.2 Adequate ventilation should be provided to keep solvent and diluent concentrations below the personnel exposure limits for typical work areas provided in the material safety factors table.
A4.3 There may also be other dangers such as flammable, explosive, corrosive, etc. A5 test steps
A5.1 Characteristic odor - Dip 25mm×75mm odorless rapid qualitative filter paper strips 50mm into the sample and reference standard in a beaker or other suitable container, and immediately compare the two strips on the filter paper The smell of a substance. A5.2 Residual odor - Dip a 25mm×75mm odorless rapid qualitative filter paper strip 50mm into the sample and reference standard contained in a beaker or other suitable container. Dry the filter paper in the air at room temperature and dry it at appropriate time intervals. Check for differences in their odors (see A1.3). If only the characteristic odor of the sample is determined, the evaporation step can be omitted. A6 report
A6.1 Characteristic odors are checked one by one immediately. If the odor of the sample on the wet filter paper is similar to the odor of the reference standard sample, report it as "characteristic". However, if the odor of the sample is compared with the odor of the reference standard sample and the sample is not suitable for use as a solvent, it will be reported as "non-characteristic". A6.2 Residual odor - It is assumed that the standard sample acceptable to both the supplier and the buyer has no detectable residual odor. After the standard sample and sample filter paper are dried, if there is no odor on the sample filter paper, it will be reported as "no residual odor". If there is no odor on the standard sample filter paper, but there is odor left on the sample filter paper, it will be reported as "residual odor".
218
A7 Precision and Error
GB 17602—1998
A7.1 Precision - Since the test results are only a subjective judgment of whether the sample smell is consistent with a specific reference The standard odors were of comparable similarity, so the precision of characteristic odors and residual odors was not evaluated. A7.2 Error - error that does not describe the characteristic odor or residual odor. The sense of smell of some analysts is insensitive to certain substances, while the sense of smell of others is very sensitive to major or minor components. In both cases, the precision of the odor determination is questionable. Since there are varying results on both the supply and demand side, it is helpful to conduct the evaluation by an odor panel of no less than three people. The expert panel should consider the following: familiarity with the measured odor, exposure time of major or suspected minor components, and testing environment Appendix B
(Appendix to the Standard)
Industrial Hexane Distillation range determination method
B1 range
This method is suitable for determining the distillation range of industrial hexane. B2 Referenced Standards
The provisions contained in the following standards become part of this standard by reference. Unless otherwise expressly stated in the standard, the following referenced standards shall be currently valid standards.
GB/T 6536—1986(1991)
Petroleum products distillation determination method
B3 terminology
See Chapter 3 of GB/T6536.
B4 method summary
See Chapter 4 of GB/T6536.
B5 Instrument
B5.1 Distillation flask: 200mL borosilicate glass flask, its dimensions are shown in Figure B1. 219
281~921
2||tt ||Inside 420~~22
GB 17602---1998
Reinforced curling
97~103
78
Explosive mouth||tt ||Outside 75～77
Picture Bl200mL. Distillation flask size
B5.2 distillation flask support plate: hole diameter 32mm. B5.3 Thermometer: A diffuse thermometer that meets the specifications of Table B1. Table 1
, thermometer specifications
item
measuring range
immersion depth
scale mark:
thin line graduation|| tt||Long line graduation
Digital scale interval
Maximum error allowed for scale
Maximum temperature allowed for heating in the expansion chamber
Total length
Rod (outer )Diameter
Temperature-sensing bulb length
Outer diameter of the temperature-sensing bulb
Scale positioning:
The bottom of the temperature-sensing bulb to the minimum scale temperature
Temperature-sensing bulb Bottom to minimum scale
Scale mark range length
Head
B5.4 For other distillation instruments, please refer to Chapter 6 of GB/T6536. Instrument preparation
B6
0
Thermometer specifications
48～102℃
100mm
0.2℃
1.0 ℃
2℃
0.2℃
130℃
390~400 mm
6. 0~~8. 0 mm
15~20 mm
Not larger than the rod diameter
48℃
125~145 mm
190~235 mm
Except for setting the condenser tube temperature 0 ~10℃ and sample temperature 10~20℃, please refer to Chapter 8 of GB/T6536 for other preparation work. 220 | | tt | Remove the flask from the instrument, pour the fresh sample directly into the flask, and allow the pouring time to dry for 15 to 20 seconds. B7.2 Connect the flask to the condenser tube and insert a thermometer. For the position of the thermometer in the distillation flask, see Figure 1 of GB/T6536. Place the undried measuring tape at the outlet of the condenser tube so that the condenser tube extends into the graduated cylinder by at least 25mm, but not lower than the 100mL mark. Immerse the measuring cylinder in a transparent bath and maintain the bath temperature at 1020°C throughout the distillation process. Place a flat cap on top of the measuring cylinder to prevent condensed moisture from entering the measuring cylinder.
B7.3 Heating rate: The time from the start of heating to the appearance of the first drop of liquid is 5 to 10 minutes, and the time for the steam at the bottleneck to rise to the arm is 2.5 to 3.5 minutes. Record the reading on the distillation thermometer when the initial boiling point occurs. B7.4 Adjust the input heat so that the distillation rate is 4~5mL/min (approximately 2 drops per second). After the first drop of liquid appears, remove the measuring cylinder so that the tip of the condenser tube is in contact with the wall of the measuring cylinder. According to the above heating conditions, continue distillation after the 95% point until the dry point appears. Record the reading of the distillation thermometer when the dry point occurs.
B7.5 records atmospheric pressure.
B7.6 After draining the condenser tube, read the volume of the distillate and use it as the recovery volume. The total recovery rate of the distillate should not be less than 97%. If the recovery rate is not within this range, the test should be repeated. B8 calculation
See GB/T6536 Article 10.3.
B9 report
Reports the test results of initial boiling point and dry point. B10 Precision
This method does not temporarily specify the precision of the test results. Appendix C
(Appendix of Biya)
Determination of non-volatile matter in industrial hexane
C1 range
This method is suitable for non-volatile matter in industrial hexane material measurement. C2 instrument
C2.1 oven: The temperature is controlled at 105℃±5℃. C2.2 Platinum evaporating dish: 125mL; it is best to use platinum evaporating III, aluminum or porcelain evaporating dishes can also be used. Note: Precision data are only obtained through platinum evaporated blood measurement. C2.3 Measurement summary: 100mL.
c2.4 analytical balance: sensitivity 0.1mg.
C3 Test Steps
C3.1 Place a 125mL platinum evaporating dish into an oven at 105℃ ± 5℃, dry it, and cool it in a desiccator. Repeat the above operation, 221
until the difference between the two weighings is within 0.1mg. GB17602-1998
C3.2 At room temperature, use a graduated cylinder to measure out a 100mL sample and place it into constant weight platinum evaporator III. Place the sample on a steam bath to evaporate to dryness. Wipe the outside of the platinum evaporator with a clean, lint-free cloth, dry it in an oven at 105°C ± 5°C for about 1 hour, and cool it in a desiccator. Weigh the weight of the platinum evaporator and its contents to the nearest 0.1 mg. C3.3 Put the evaporated and contents back into the oven to dry for 15 to 30 minutes, and then weigh after cooling. If necessary, repeat the above operation until the difference between the two weighings is constant within 0.1mg. C4 report
treats the residue in the sample as non-volatile matter and expresses it in mg/100 mL. C5 Precision
Judge the reliability of the test results (95% confidence level) according to the following provisions. C5.1 Repeatability: If the difference between two results obtained by the same operator on different days (each result is the average of repeated tests) is greater than 0.9mg/100mL, it should be considered suspicious.
C5.2 Reproducibility: The difference between two results (each result is the average of repeated tests) obtained by operators from different laboratories is greater than 2.4 mg/100mL, which should be considered suspicious.
222
3 Thermometer: A diffuse thermometer that meets the specifications in Table B1. Table 1
, thermometer specifications
item
measuring range
immersion depth
scale mark:
thin line graduation|| tt||Long line graduation
Digital scale interval
Maximum error allowed for scale
Maximum temperature allowed for heating in the expansion chamber
Total length
Rod (outer )Diameter
Temperature-sensing bulb length
Outer diameter of the temperature-sensing bulb
Scale positioning:
The bottom of the temperature-sensing bulb to the minimum scale temperature
Temperature-sensing bulb Bottom to minimum scale
Scale mark range length
Head
B5.4 For other distillation instruments, please refer to Chapter 6 of GB/T6536. Instrument preparation
B6
0
Thermometer specifications
48～102℃
100mm
0.2℃
1.0 ℃
2℃
0.2℃
130℃
390~400 mm
6. 0~~8. 0 mm
15~20 mm
Not larger than the rod diameter
48℃
125~145 mm
190~235 mm
Except for setting the condenser tube temperature 0 ~10℃ and sample temperature 10~20℃, please refer to Chapter 8 of GB/T6536 for other preparation work. 220 | | tt | Remove the flask from the instrument, pour the fresh sample directly into the flask, and allow the pouring time to dry for 15 to 20 seconds. B7.2 Connect the flask to the condenser tube and insert the thermometer. For the position of the thermometer in the distillation flask, see Figure 1 of GB/T6536. Place the undried measuring tape at the outlet of the condenser tube so that the condenser tube extends into the graduated cylinder by at least 25mm, but not lower than the 100mL mark. Immerse the measuring cylinder in a transparent bath and maintain the bath temperature at 1020°C throughout the distillation process. Place a flat cap on top of the measuring cylinder to prevent condensed moisture from entering the measuring cylinder.
B7.3 Heating rate: The time from the start of heating to the appearance of the first drop of liquid is 5 to 10 minutes, and the time for the steam at the bottleneck to rise to the arm is 2.5 to 3.5 minutes. Record the reading on the distillation thermometer when the initial boiling point occurs. B7.4 Adjust the input heat so that the distillation rate is 4~5mL/min (approximately 2 drops per second). After the first drop of liquid appears, remove the measuring cylinder so that the tip of the condenser tube is in contact with the wall of the measuring cylinder. According to the above heating conditions, continue distillation after the 95% point until the dry point appears. Record the reading of the distillation thermometer when the dry point occurs.
B7.5 records atmospheric pressure.
B7.6 After draining the condenser tube, read the volume of the distillate and use it as the recovery volume. The total recovery rate of the distillate should not be less than 97%. If the recovery rate is not within this range, the test should be repeated. B8 calculation
See GB/T6536 Article 10.3.
B9 report
Reports the test results of initial boiling point and dry point. B10 Precision
This method does not temporarily specify the precision of the test results. Appendix C
(Appendix of Biya)
Determination of non-volatile matter in industrial hexane
C1 range
This method is suitable for non-volatile matter in industrial hexane material measurement. C2 instrument
C2.1 oven: The temperature is controlled at 105℃±5℃. C2.2 Platinum evaporating dish: 125mL; it is best to use platinum evaporating III, aluminum or porcelain evaporating dishes can also be used. Note: Precision data are only obtained through platinum evaporated blood measurement. C2.3 Measurement summary: 100mL.
c2.4 analytical balance: sensitivity 0.1mg.
C3 Test Steps
C3.1 Place a 125mL platinum evaporating dish into an oven at 105℃ ± 5℃, dry it, and cool it in a desiccator. Repeat the above operation, 221
until the difference between the two weighings is within 0.1mg. GB17602-1998
C3.2 At room temperature, use a graduated cylinder to measure out a 100mL sample and place it into constant weight platinum evaporator III. Place the sample on a steam bath to evaporate to dryness. Wipe the outside of the platinum evaporator with a clean, lint-free cloth, dry it in an oven at 105°C ± 5°C for about 1 hour, and cool it in a desiccator. Weigh the weight of the platinum evaporator and its contents to the nearest 0.1 mg. C3.3 Put the evaporated and contents back into the oven to dry for 15 to 30 minutes, and then weigh after cooling. If necessary, repeat the above operation until the difference between the two weighings is constant within 0.1 mg. C4 report
treats the residue in the sample as non-volatile matter and expresses it in mg/100 mL. C5 Precision
Judge the reliability of the test results (95% confidence level) according to the following provisions. C5.1 Repeatability: If the difference between two results obtained by the same operator on different days (each result is the average of repeated tests) is greater than 0.9mg/100mL, it should be considered suspicious.
C5.2 Reproducibility: The difference between two results (each result is the average of repeated tests) obtained by operators from different laboratories is greater than 2.4 mg/100mL, which should be considered suspicious.
222
3 Thermometer: A diffuse thermometer that meets the specifications in Table B1. Table 1
, thermometer specifications
item
measuring range
immersion depth
scale mark:
thin line graduation|| tt||Long line graduation
Digital scale interval
Maximum error allowed for scale
Maximum temperature allowed for heating in the expansion chamber
Total length
Rod (outer )Diameter
Temperature-sensing bulb length
Outer diameter of the temperature-sensing bulb
Scale positioning:
The bottom of the temperature-sensing bulb to the minimum scale temperature
Temperature-sensing bulb Bottom to minimum scale
Scale mark range length
Head
B5.4 For other distillation instruments, please refer to Chapter 6 of GB/T6536. Instrument preparation
B6
0
Thermometer specifications
48～102℃
100mm
0.2℃
1.0 ℃
2℃
0.2℃
130℃
390~400 mm
6. 0~~8. 0 mm
15~20 mm
Not larger than the rod diameter
48℃
125~145 mm
190~235 mm
Except for setting the condenser tube temperature 0 ~10℃ and sample temperature 10~20℃, please refer to Chapter 8 of GB/T6536 for other preparation work. 220 | | tt | Remove the flask from the instrument, pour the fresh sample directly into the flask, and allow the pouring time to dry for 15 to 20 seconds. B7.2 Connect the flask to the condenser tube and insert a thermometer. For the position of the thermometer in the distillation flask, see Figure 1 of GB/T6536. Place the undried measuring tape at the outlet of the condenser tube so that the condenser tube extends into the graduated cylinder by at least 25mm, but not lower than the 100mL mark. Immerse the measuring cylinder in a transparent bath and maintain the bath temperature at 1020°C throughout the distillation process. Place a flat cap on top of the measuring cylinder to prevent condensed moisture from entering the measuring cylinder.
B7.3 Heating rate: The time from the start of heating to the appearance of the first drop of liquid is 5 to 10 minutes, and the time for the steam at the bottleneck to rise to the arm is 2.5 to 3.5 minutes. Record the reading on the distillation thermometer when the initial boiling point occurs. B7.4 Adjust the input heat so that the distillation rate is 4~5mL/min (approximately 2 drops per second). After the first drop of liquid appears, remove the measuring cylinder so that the tip of the condenser tube is in contact with the wall of the measuring cylinder. According to the above heating conditions, continue distillation after the 95% point until the dry point appears. Record the reading of the distillation thermometer when the dry point occurs.
B7.5 records atmospheric pressure.
B7.6 After draining the condenser tube, read the volume of the distillate and use it as the recovery volume. The total recovery rate of the distillate should not be less than 97%. If the recovery rate is not within this range, the test should be repeated. B8 calculation
See GB/T6536 Article 10.3.
B9 report
Reports the test results of initial boiling point and dry point. B10 Precision
This method does not temporarily specify the precision of the test results. Appendix C
(Appendix of Biya)
Determination of non-volatile matter in industrial hexane
C1 range
This method is suitable for non-volatile matter in industrial hexane material measurement. C2 instrument
C2.1 oven: The temperature is controlled at 105℃±5℃. C2.2 Platinum evaporating dish: 125mL; it is best to use platinum evaporating III, aluminum or porcelain evaporating dishes can also be used. Note: Precision data are only obtained through platinum evaporated blood measurement. C2.3 Measurement summary: 100mL.
c2.4 analytical balance: sensitivity 0.1mg.
C3 Test Steps
C3.1 Place a 125mL platinum evaporating dish into an oven at 105℃ ± 5℃, dry it, and cool it in a desiccator. Repeat the above operation, 221
until the difference between the two weighings is within 0.1mg. GB17602-1998
C3.2 At room temperature, use a graduated cylinder to measure out a 100mL sample and place it into constant weight platinum evaporator III. Place the sample on a steam bath to evaporate to dryness. Wipe the outside of the platinum evaporator with a clean, lint-free cloth, dry it in an oven at 105°C ± 5°C for about 1 hour, and cool it in a desiccator. Weigh the weight of the platinum evaporator and its contents to the nearest 0.1 mg. C3.3 Put the evaporated and contents back into the oven to dry for 15 to 30 minutes, and then weigh after cooling. If necessary, repeat the above operation until the difference between the two weighings is constant within 0.1mg. C4 report
treats the residue in the sample as non-volatile matter, expressed in mg/100 mL. C5 Precision
Judge the reliability of the test results (95% confidence level) according to the following provisions. C5.1 Repeatability: If the difference between two results obtained by the same operator on different days (each result is the average of repeated tests) is greater than 0.9 mg/100mL, it should be considered suspicious.
C5.2 Reproducibility: The difference between two results (each result is the average of repeated tests) obtained by operators from different laboratories is greater than 2.4 mg/100mL, which should be considered suspicious.
222
3 items.
B9 report
Reports the test results of initial boiling point and dry point. B10 Precision
This method does not temporarily specify the precision of the test results. Appendix C
(Appendix of Biya)
Determination of non-volatile matter in industrial hexane
C1 range
This method is suitable for non-volatile matter in industrial hexane material measurement. C2 instrument
C2.1 oven: The temperature is controlled at 105℃±5℃. C2.2 Platinum evaporating dish: 125mL; it is best to use platinum evaporating III, aluminum or porcelain evaporating dishes can also be used. Note: Precision data are only obtained through platinum evaporated blood measurement. C2.3 Measurement summary: 100mL.
c2.4 analytical balance: sensitivity 0.1mg.
C3 Test Steps
C3.1 Place a 125mL platinum evaporating dish into an oven at 105℃ ± 5℃, dry it, and cool it in a desiccator. Repeat the above operation, 221
until the difference between the two weighings is within 0.1mg. GB17602-1998
C3.2 At room temperature, use a graduated cylinder to measure out a 100mL sample and place it into constant weight platinum evaporator III. Place the sample on a steam bath to evaporate to dryness. Wipe the outside of the platinum evaporator with a clean, lint-free cloth, dry it in an oven at 105°C ± 5°C for about 1 hour, and cool it in a desiccator. Weigh the weight of the platinum evaporator and its contents to the nearest 0.1 mg. C3.3 Put the evaporated and contents back into the oven to dry for 15 to 30 minutes, and then weigh after cooling. If necessary, repeat the above operation until the difference between the two weighings is constant within 0.1mg. C4 report
treats the residue in the sample as non-volatile matter and expresses it in mg/100 mL. C5 Precision
Judge the reliability of the test results (95% confidence level) according to the following provisions. C5.1 Repeatability: If the difference between two results obtained by the same operator on different days (each result is the average of repeated tests) is greater than 0.9mg/100mL, it should be considered suspicious.
C5.2 Reproducibility: The difference between two results (each result is the average of repeated tests) obtained by operators from different laboratories is greater than 2.4 mg/100mL, which should be considered suspicious.
222
3 items.
B9 report
Reports the test results of initial boiling point and dry point. B10 Precision
This method does not temporarily specify the precision of the test results. Appendix C
(Appendix of Biya)
Determination of non-volatile matter in industrial hexane
C1 range
This method is suitable for non-volatile matter in industrial hexane material measurement. C2 instrument
C2.1 oven: The temperature is controlled at 105℃±5℃. C2.2 Platinum evaporating dish: 125mL; it is best to use platinum evaporating III, aluminum or porcelain evaporating dishes can also be used. Note: Precision data are only obtained through platinum evaporated blood measurement. C2.3 Measurement summary: 100mL.
c2.4 analytical balance: sensitivity 0.1mg.
C3 Test Steps
C3.1 Place a 125mL platinum evaporating dish into an oven at 105℃ ± 5℃, dry it, and cool it in a desiccator. Repeat the above operation, 221
until the difference between the two weighings is within 0.1mg. GB17602-1998
C3.2 At room temperature, use a graduated cylinder to measure out a 100mL sample and place it into constant weight platinum evaporator III. Place the sample on a steam bath to evaporate to dryness. Wipe the outside of the platinum evaporator with a clean, lint-free cloth, dry it in an oven at 105°C ± 5°C for about 1 hour, and cool it in a desiccator. Weigh the weight of the platinum evaporator and its contents to the nearest 0.1 mg. C3.3 Put the evaporated and contents back into the oven to dry for 15 to 30 minutes, and then weigh after cooling. If necessary, repeat the above operation until the difference between the two weighings is constant within 0.1mg. C4 report
treats the residue in the sample as non-volatile matter and expresses it in mg/100 mL. C5 Precision
Judge the reliability of the test results (95% confidence level) according to the following provisions. C5.1 Repeatability: If the difference between two results obtained by the same operator on different days (each result is the average of repeated tests) is greater than 0.9mg/100mL, it should be considered suspicious.
C5.2 Reproducibility: The difference between two results (each result is the average of repeated tests) obtained by operators from different laboratories is greater than 2.4 mg/100mL, which should be considered suspicious.
222
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