GB/T 3286.9-1998 Chemical analysis methods for limestone and dolomite - Determination of carbon dioxide content
Some standard content:
GB/T3286.9—1998
This standard amends GB/T3286.9—1982 "Chemical analysis methods for limestone and dolomite - Determination of carbon dioxide by caustic soda asbestos absorption gravimetric method".
This revision of the standard specifies that it is also applicable to the determination of carbon dioxide in metallurgical lime in the "scope". The "allowable difference" adds the laboratory allowable difference.
This revision adds Appendix A "Determination of carbon dioxide in metallurgical lime by combustion gas volumetric method" so that general laboratories can use the instruments they usually carry to determine the amount of carbon dioxide. GB/T3286 "Chemical analysis methods for limestone and dolomite" includes the following nine substandards: GB/T3286.1 Determination of calcium oxide and magnesium oxide content; GB/T 3286.2 Determination of silicon dioxide content; Determination of aluminum oxide content; GB/T 3286. 3 GB/T 3286. 4 Determination of iron oxide content; GB/T 3286. 5 Determination of manganese oxide content; GB/T 3286.6 Determination of phosphorus content; GB/T 3286. 7 Determination of sulfur content GB/T3286.8 Determination of loss on ignition; Determination of carbon dioxide content.
GB/T 3286. 9
This standard replaces GB/T3286.9-1982 from the date of implementation. Appendix A and Appendix B of this standard are both standard appendices. This standard was proposed by the former Ministry of Metallurgical Industry of the People's Republic of China. This standard is under the jurisdiction of the Information Standards Research Institute of the former Ministry of Metallurgical Industry. This standard was drafted by Wuhan Iron and Steel (Group) Corporation. The drafting units of this standard are: Wuhan Iron and Steel (Group) Corporation Technology Center, Taiyuan Iron and Steel Corporation Iron and Steel Research Institute. The main drafters of this standard are: Cao Hongyan, Dong Lanfang, Qian Jiasong, Cai Tianyun, Xu Mengfang. This standard was first issued in July 1982.
1 Scope
National Standard of the People's Republic of China
Chemical analysis methods of limestone and dolomite-
The determination of carbon dioxide content
Methods for chemical analysis oflimestone and dolomite-
The determination of carbon dioxide contentThis standard specifies the determination of carbon dioxide content by caustic soda asbestos absorption weight method. GB/T3286.9--1998
Replaces GB/T3286.9-1982
This standard applies to the determination of carbon dioxide content in limestone and dolomite, and also to the determination of carbon dioxide content in metallurgical lime. Appendix A (Annex to the standard) Combustion gas volumetric method, determination range: carbon dioxide content greater than 0.50%. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2007.2—1987 Sampling and sample preparation of bulk mineral products Manual sample preparation method 3 Method summary
The sample is decomposed with phosphoric acid, and dry air that has been decarbonated is used as the carrier gas. The generated carbon dioxide is absorbed by caustic soda asbestos. The amount of carbon dioxide is calculated based on its increased mass.
The water generated during the decomposition of the sample is absorbed by sulfuric acid and magnesium perchlorate, and the hydrogen sulfide generated by sulfide is absorbed and removed by chromium trioxide sulfuric acid solution.
4 Reagents
4.1 Soda lime.
4.2 Caustic soda asbestos, particle size 0.5~~1mm.
4.3 Anhydrous magnesium perchlorate, particle size 0.5~1mm, dry in a drying oven at 180℃ for 2h, quickly move to a dryer, cool and set aside. Note: Used magnesium perchlorate can be reused after drying. 4.4 Anhydrous calcium chloride.
4.5 High-purity calcium carbonate (not less than 99.99%). 4.6 Dehydrated sulfuric acid: Place sulfuric acid (p1.84g/mL) in a beaker, heat until it smokes and keep it for a while, cool it slightly, carefully place it in a desiccator, cool it for later use.
4.7 Phosphoric acid (1+1).
4.8 Chromium trioxide sulfuric acid solution (10g/1.): Take 1g of chromium trioxide in a beaker, add 1mL of water, add 100mL of sulfuric acid (p1.84g/mL) to dissolve, and mix.
Approved by the State Administration of Quality and Technical Supervision on December 7, 1998 and implemented on July 1, 1999
5 Instruments and devices
The device for measuring carbon dioxide is shown in Figure 1.
GB/T 3286. 9 -- 1998
1Micro glass rotor flowmeter; 2, 3, 13-drying tower: 4-special acid adding tube, 5-special connecting tube; 6-sample dissolving conical flask; 6.1-glass conduit; 7-straight condenser, 8-two-way piston glass tube; 9, 10, 14-gas washing bottle; 11, 12-U-shaped tube; 15 water flow suction tube; A, B, G, D, F, H spring clip, C, E-piston Figure 1
Schematic diagram of carbon dioxide determination device
Absorbent cotton
High acid (about 1/5)
Caustic soda asbestos (about 4/5)
Figure 2 Schematic diagram of filling U-shaped tube for absorbing carbon dioxide 84
GB/T 3286.9—1998
Figure 3 Carbon dioxide absorption bottle
5.1 Rotor flowmeter (Figure 1 Note 1), 20～200mL/min, used to observe the flow rate of air as carrier gas. 5.2 Drying tower (Figure 1 Note 2): volume is about 500mL, filled with soda lime (4.1). 5.3 Drying tower (Figure 1 Note 3): volume is about 500mL, filled with anhydrous calcium chloride (4.4). 5.4 Special acid addition tube (Figure 1 Note 4), volume is 30ml. 5.5 Special connecting tube (Figure 1 Note 5), connected with 5.3 and 5.4 by double-hole rubber stopper. 5.6 Sample dissolving conical flask (Figure 1 Note 6), volume is 150～250mL, connected with 5.5 and 5.7 by double-hole rubber stopper. 5.6.1 Glass tube (Figure 1 Note 6.1), inner diameter 2-3mm, end bent upward into a small hook, connected to 4.5 through a rubber stopper. 5.7 Straight condenser (Figure 1 Note 7), outer tube about 300mm long. Two-way piston glass tube (Figure 1 Note 8).
5.9 Gas washing bottle (Figure 1 Note 9), filled with chromium trioxide sulfuric acid solution (4.8). 5.10 Gas washing bottle (Figure 1 Note 10), filled with dehydrated sulfuric acid (4.6), and the speed of bubble generation can be observed at the same time. 5.11 U-shaped tube (Figure 1 Note 11, with side tube and glass piston, 13mm×100mm), filled with anhydrous magnesium perchlorate (4.3). The carbon dioxide absorption U-shaped tube (Figure 1 Note 12, the same specifications as 5.11) contains not less than 8g of caustic soda asbestos (4.2) and about 2g of anhydrous high 5.12
magnesium chlorate (4.3). The filling method is shown in Figure 2. Note: This carbon dioxide absorption U-shaped tube can be replaced by an absorption bottle (specifications see Figure 3), with caustic soda asbestos (4.2) about 40mm high in the lower part of the bottle, anhydrous magnesium perfluoride (4.3) 10mm high in the upper part, and a small amount of absorbent cotton in the middle and upper part. 3 Drying tower (Figure 1 Note 13), the lower half contains anhydrous calcium chloride (4.4, the upper half contains soda lime (4.1), separated by absorbent cotton. 5.13
5.14 Gas washing bottle (Figure 1 Note 14), filled with water. 5.15 Water flow suction pipe (Figure 1 Note 15), connected to the faucet. 5.16 The various parts of the device are connected with hoses of appropriate length according to Figure 1, and the devices are fixed with corresponding clamps. 6 Sample preparation
According to GB/T2 007.2 Preparation of samples.
6.1 The samples should be processed to a particle size of less than 0.125 mm. 6.2 Before analysis, the limestone and dolomite samples should be dried at 105-110°C for 2 hours and placed in a desiccator to cool to room temperature. 6.3 The preparation of metallurgical lime samples should be carried out quickly. After preparation, the samples should be immediately placed in a ground-mouth bottle or plastic bag, sealed, and stored in a desiccator. The samples should not be dried before analysis.
7 Analysis steps
7. 1 Sample quantity
GB/T3286.9—1998
For limestone and dolomite samples, weigh 0.50g of sample, accurate to 0.0001g. For metallurgical lime samples, weigh the sample quickly. If the carbon dioxide content is less than 10.0%, weigh 2.0g of sample; if it is greater than 10.0%, weigh 1.0g of sample, accurate to 0.0001g. 7.2 Inspection of instruments and devices
7.2.1 Before inspection, all spring clips and pistons in the measuring system are in the open state except C, which is closed. 7.2.2 Open the air pump valve and control the water flow rate to stabilize the air flow rate of the measuring system at about 200 mL/min. 7.2.3 After adjusting the piston, keep the air flow rate at about 180 mL/min. Close A and keep it for a few minutes. At this time, the bubbles in the wash bottle (5.10 and 5.14) should gradually decrease until they disappear. Otherwise, it means that there is a leak in the measuring system. If there is a leak, check it section by section, find out the leaking part and deal with it until the whole system is tight and leak-free. 7.3 Calibration of instruments and devices
Calibration of instruments and devices According to 7.4, weigh 0.50g (accurate to 0.0001g) of calcium carbonate (4.5) that has been dried at 105~~110℃ for 2h and cooled to room temperature as a test material. When the measured carbon dioxide content is within the range of 43.97%±0.35%, it means that the measuring system is correct and the sample analysis can be carried out.
7.4 Determination
7.4.1 Adjust piston E to control the air flow rate at 170~180mL/min and maintain it for about 15 minutes. Close F, wait for the bubbles in the gas washing bottle (5.10) to stop, close the pistons of the U-tube (5.12 and 5.11) in turn, and remove the U-tube (5.12). Gently wipe it with clean gauze, place it on the balance for 15 minutes, and weigh it.
Note: When the relative turbidity of air is less than 45%, wipe it with slightly damp gauze to eliminate the influence of static electricity on the weighing. 7.4.2 Connect the U-tube (5.12) to the determination system again, and operate according to 7.4.1 until the difference between the two weighings is no more than 0.5mg. The mass obtained by the last weighing is the mass of the U-tube before absorbing carbon dioxide. 7.4.3 Connect the U-shaped tube (5.12), close B and D, remove the sample dissolving conical flask (5.6), transfer the sample to the sample dissolving conical flask (5.6), and rinse the cup wall with a small amount of water.
7.4.4 Connect the sample dissolving conical flask (5.6) to the measuring device, open the water flow of D and the connected condenser (5.7). Add 15mL of phosphoric acid (4.7) (add 30mL of phosphoric acid to the lime sample) to the special acid adding tube (5.5), slowly open the piston C, add 4~5 drops of phosphoric acid (4.7), and add 45 drops after the violent reaction stops. Repeat this process until the reaction is complete. Add the remaining acid in the acid adding tube (5.5) to the sample dissolving conical flask (5.6) (1~~2mL is left), add 10mL of water to the acid adding tube (5.5), open C, add water to the sample dissolving conical flask (5.6), close C (1~2mL of water is left). Slowly heat the sample dissolving conical flask (5.6) to boiling and keep it for 2min, then turn off the heat source. 7.4.5 Open B, adjust piston E to keep the airflow at 170~~180mL/min, and keep the ventilation for about 1.5h. 7.4.6 Close F, wait until the bubbles in the gas washing bottle (5.10) stop, close the pistons of the U-shaped tube (5.12 and 5.11) in turn, and remove the U-shaped tube (5.12). Gently wipe with clean gauze (see note 7.4.1), place in the balance box for 15min, and weigh. 7.4.7 Connect the U-shaped tube (5.12) to the measuring system again, open the corresponding piston and spring clip, and re-ventilate for about 20 minutes. Then follow the steps in 7.4.6 and repeat until the difference between the two weighings is no more than 0.5 mg. The last weighed mass is the mass of the U-shaped tube after carbon dioxide absorption.
The whole measuring process needs to be carried out continuously.
2When about 2/3 of the caustic soda asbestos in the U-shaped tube (5.12) turns white, replace it with a new U-shaped tube filled with caustic soda asbestos according to Figure 2. 7.4.8After the measurement is completed, connect the U-shaped tube (5.12) to the measuring system, close B, DG, and H in sequence, and finally close the exhaust valve to prevent water from flowing back.
8Description of analysis results
Calculate the mass percentage of carbon dioxide according to formula (1): 86
GB/T3286.9—1998
m m2 × 100
CO,(%) =
Where: mi—
mass of the U-tube after absorbing carbon dioxide, m2—mass of the U-tube before absorbing carbon dioxide, g; —sample amount, g.
9Allowable difference
The difference between the results of two independent analyses in a laboratory and the difference between the results of analyses in two laboratories should not be greater than the corresponding allowable difference listed in Table 1. For metallurgical lime samples, no allowable difference requirement between laboratories is required. Table 1
Carbon dioxide content
Limestone, dolomite
>5.0010.00
Intra-laboratory tolerance
Inter-laboratory tolerance
A1 Range
GB/T3286.9—1998
Appendix A
(Standard Appendix)
Determination of carbon dioxide content in metallurgical lime by combustion gas volumetric method This method is applicable to the determination of carbon dioxide content in lime that does not contain organic matter and free carbon. The determination range: carbon dioxide content is greater than 0.50%.
A2 Method Summary
The sample is burned in a high-temperature tubular furnace with oxygen, and carbonate decomposes. The generated carbon dioxide and other mixed gases are collected in a gas measuring tube after drying and desulfurization, and the volume is fixed. Then, the carbon dioxide in the mixed gas is absorbed by potassium hydroxide solution. The difference between the gas volume before and after absorption is the carbon dioxide volume, and the carbon dioxide content is calculated from this.
3 Reagents
A3.1 Caustic soda asbestos, particle size 0.5~1mm. A3.2 Anhydrous calcium fluoride.
A3.3 Anhydrous magnesium perchlorate, particle size 0.5~~1mm. A3.4 Granular active manganese dioxide (or granular silver vanadate). A3.5 Sulfuric acid (p1.84g/mL).
A3.6 Potassium permanganate-potassium hydroxide solution: Take 30g potassium hydroxide and dissolve it in 70mL saturated potassium permanganate solution. A3.7 Potassium hydroxide solution (400g/L). A3.8
Acidic water: Add a few drops of methyl orange solution (0.1g/100mL) to 1000mL sulfuric acid (1+1000), the solution is light red and mixed. 9 Sodium chloride acid solution (260g/L), add a few drops of methyl orange solution (0.1g/100mL) and add sulfuric acid (1+1) until it turns light red. A3.9
A4 Instruments and devices
See Figure A1 for the carbon dioxide measuring device.
GB/T 3286.9—1998
1- oxygen cylinder; 2- pressure reducing valve and oxygen meter, 3 buffer bottle; 4, 5- gas washing bottle; 6- drying tower; 7- oxygen piston; 8- heat-resistant connecting plug; 9- high temperature tube furnace; 10- temperature automatic controller: 11- drying tube: 12- desulfurization tube; 13- carbon meter (a condenser, b gas measuring tube, c level bottle, d absorber, e small three-way piston, f large three-way piston); 14- combustion tube; 15- porcelain boat Figure A1 Schematic diagram of carbon dioxide measuring device
gas cylinder (Figure Note 1).
Pressure reducing valve and oxygen meter (Figure Note 2).
Buffer bottle (Figure Note 3).
A4.4 Gas washing bottle (Figure Note 4), filled with potassium permanganate-potassium hydroxide solution (A3.6), the filling volume accounts for one third of the bottle height-A4.5 Gas washing bottle (Figure Note 5), filled with sulfuric acid (A3.5), the filling volume accounts for one third of the bottle height. 5 In the drying tower (Figure Note 6), the upper layer is filled with caustic soda asbestos (A3.1), the lower layer is filled with anhydrous calcium nitride (A3.2), the middle is separated by glass wool, and the bottom and the top of A4.6
are covered with glass wool.
A4.7 Oxygen piston (Figure Note 7).
A4.8 Heat-resistant connecting plug (Figure Note 8), with side pipe, connected to the oxygen piston (A4.7). A4.9 High temperature tube furnace (Figure Note 9), with thermocouple and automatic temperature control device (Figure Note 10). A4.10
Drying tube (Figure Note 11), filled with anhydrous magnesium perchlorate (A3.3), with glass wool at both ends. When the drying capacity decreases, replace the magnesium perchlorate in time.
Note: The water-absorbent magnesium perchlorate can be reused after drying at 180℃ in a drying oven for 2 hours. 89
GB/T3286.9-1998
A4.11 Desulfurization tube (Figure Note 12), filled with granular active manganese dioxide (A3.4), with glass wool at both ends. Granular silver vanadate can be used instead of granular manganese dioxide.
A4.12 Carbon determination instrument (gas volume measuring instrument, Figure Note 13). The carbon determination instrument should be installed 300~～500mm away from the high temperature tube furnace to avoid sunlight.
The basic components of the carbon analyzer are:
a. A gas tube.
b. A gas tube filled with acidic water (A3.8) or sodium chloride acid solution (A3.9). The gas tube must be kept clean. When water droplets adhere to the inner wall of the gas tube, it must be cleaned with chromic acid cleaning solution. c. A water push bottle.
d. An absorber filled with potassium hydroxide solution (A3.7), e small three-way piston, connects the condenser (a) and the gas measuring tube (b), and can also connect the condenser (a) or the gas measuring tube (b) to the atmosphere. f large three-way piston, connects the gas measuring tube to the condenser (a) or the absorber (d) respectively. A4.13 porcelain tube (Figure Note 14), 600mm long, 23mm inner diameter. The thick end is connected to the heat-resistant connecting plug (A4.8), and the tapered end is connected to the desulfurization tube (A.4.11). When using, first check for leaks, and then burn in sections. A4.14 porcelain boat (Figure Note 15), 88mm or 97mm long, before use, burn in a 1200℃ tube furnace with oxygen for 2 to 4min, or burn in a 1000℃ high-temperature furnace for 1h, and after cooling, store in an unoiled desiccator containing caustic soda asbestos (or soda lime) and anhydrous calcium chloride for use.
A4.15 Long hook, made of low-carbon nickel-chromium wire or heat-resistant alloy wire, used to push and pull out the porcelain boat. A4.16 The various parts of the device are connected with hoses of appropriate length according to Figure A1. A5 Sample preparation
Prepare the sample according to GB/T2007.2.
A5.1 The sample should be processed to a particle size of less than 0.125mm. A5.2 The sample preparation should be carried out quickly. After preparation, the sample is immediately placed in a ground-mouth bottle or plastic bag and sealed, and stored in a desiccator. The sample is not dried before analysis. wwW.bzxz.Net
A6 Analysis steps
A6.1 Sample quantity
Quickly weigh the sample according to Table A1, accurate to 0.0001g. Table A1
Carbon dioxide amount, %
>5. 0~10. 0
Sample amount,
A6.2 Blank test
Carry out a blank test with the sample.
GB/T 3286. 9 --- 1998
Note: The temperature of the solution in the gas measuring tube (A4.12b) and the absorber (A4.12d) should be consistent with that of the mixed gas to be measured, otherwise positive or negative blank values will be generated. Before analysis, the blank test should be repeated until the blank value is stable. Due to the change of room temperature and the change of water temperature in the condenser (A4.12a) during analysis, blank tests must be performed frequently during the measurement of the sample, and the blank value should be deducted from the measured value of the sample. A6.3 Determination
A6.3.1 Connect the carbon dioxide measuring device according to Figure A1. After replacing the solution in the gas measuring tube (A4.12b) or absorber (A4.12d), or replacing the desiccant or desulfurizer, a few high carbon samples should be made first, and the samples should be analyzed after they are saturated with carbon dioxide. A6.3.2 Raise the furnace temperature to 1200-1250℃, check and adjust the device with oxygen to make it airtight. Adjust and keep the device in the ready working state.
A6.3.3 Place the sample in the porcelain boat (A4.14). Open the heat-resistant connecting plug (A4.8), put the porcelain boat (A4.14) into the porcelain tube (A4.13), push it to the high temperature zone with a long hook (A4.15), and immediately plug the heat-resistant connecting plug (A4.8). A6.3.4 Open the large and small three-way pistons (A4.12e, A4.12f) of the carbon analyzer to connect the porcelain tube (A4.13) with the gas measuring tube (A4.12b), and preheat for 60 seconds.
A6.3.5 Open the oxygen piston (A4.7), adjust the oxygen flow rate, and control it within about 90 seconds so that the carbon dioxide and carrier gas mixed gas fills the gas measuring tube, and close the oxygen piston (A4.7). The following is the operation steps of the carbon analyzer, and measure the reading (volume or content) of the carbon dioxide amount on the scale of the carbon analyzer gas measuring tube (A4.12b).
Note: For samples with a carbon dioxide amount greater than 10.0%, it is necessary to pass oxygen again to determine the amount of carbon dioxide remaining in the system. The sum of the readings measured again is the reading of the carbon dioxide amount in the sample.
A6.3.6 Open the heat-resistant connecting plug (A4.8), pull out the porcelain boat (A4.14) with a long hook, and plug the heat-resistant connecting plug (A4,8). A7 Expression of analysis results
A7.1 When the reading of the gas tube scale is volume (mI.), calculate the mass percentage of carbon dioxide according to formula (A1): cO (%) = A: × 100
Where: A—
(A1)
Temperature 16℃, air pressure 101.3kPa, mass of carbon dioxide per milliliter on the closed liquid surface (g). When acidic water (A3.8) is used as the closed liquid, the A value is 0.001834g/mL. When sodium fluoride acid solution (A3.9) is used as the sealing liquid, the A value is 0.001842 g/mL;
V is the volume of carbon dioxide read from the gas tube scale, mL; f-
temperature and pressure correction coefficients. The correction coefficients are different when different sealing liquids are used. See Appendix B (Standard Appendix) Table B1 or Table B2;
—sample amount, g.
A7.2 When the gas tube reading is the carbon content (for example, some carbon analyzers mark 25mL volume as 1.250%, and some mark 30ml volume as 1.500%), calculate the mass percentage of carbon dioxide according to formula (A2): 20A·X·f×100
CO2(%)=
Wherein: A, f, m have the same meanings as in formula (A1); carbon content read out by the gas tube scale;
is the coefficient for converting the carbon content read out by the scale into the volume of carbon dioxide (i.e. 25/1.250). (A2)
100Pa
GB/T3286.9-1998
Gas volumetric method for measuring
(Standard
Temperature, pressure
Temperature and pressure correction coefficients for carbon dioxide content Table 16
o. 7740. 771b. 768j0. 764o. 7610. 7570. 7540. 7500.7460. 7430. 7390. 7350. 7320. 7280.7240. 720o.7160. 712o. 7770. 7730. 7700. 7660. 7630. 7590. 7560.7520. 7480. 745b. 7410. 7370. 7340. 7300. 7260. 7220. 7180. 714o. 779io. 775o. 772o. 768l0. 765jo. 761o. 758o.7470.7430.7400.7360.7320.7280.7240.7200.716k
0.7810 .7770.7740.7700.7670.7630.7600.7560.7530.7490.7450.7420.77380. 7340. 7300.7260. 7220. 7180.7830.7790.7760.7720.7690.7650E
7550. 7510. 7470. 7440. 7400. 7360. 7320. 7280. 7240. 7200. 7850. 7810.7780.7740. 7710. 7670. 7640. 7600.7570.7530.7490.7460o.7420.7380.7340.73o.7260.7220.7870.7840.7800.7770 .7730.7690.7660.7620.7590.7550.0.7510.7480.7440.7400.7360.7320.7280.724jo. 7890. 7860. 7820. 7790. 7750. 771o. 7680. 7640. 761o. 7570. 7530. 75Qo. 7460. 7420. 7380. 7340. 730o. 726o. 7910. 788o. 784o. 781b. 7770. 7740. 770o0.7660. 7630.
o.7930.7900.7860.783j0.7790.7760.7720520.7480.74410.7400.7360.7320.728.7650.7610.7570.7540.7500.7460 .7420.7380.7340.7300.7950.7920.7880.785/0.7810.7780.7740.7700.7670.7630.7590.7560.7520.7480.7440.7400.7360.732o. 7970.7940.7900.7870.7830.78Q0.7760.7720.7690. 7650. 7610.7580.754jo.7500.7460.7420. 7380. 7347780.7740. 7710.7670.7630.760.7560.7520. 7480. 7440.7400.736o. 8000. 7960. 7920. 7890. 785j0. 7820.Jo. 8020. 7980. 795l0. 7910. 7870. 7840. 7800.0.7690.7650.7620.7580.7540.7500.7460.7420.73817760. 7730.
o.8040.800o.7970.7930.7890.7860.7820.7780.7750.771b.7670.7640.7 600.75610.7520.7480.7440.7400.806j0.8020.7990.7950.7920.7880.7840.7810.10. 8080. 8040. 8010. 7970. 7940. 7900. 7860. 783bo. 8100. 8060. 8030. 7990. 7960. 7920. 7880.0. 8120. 8090. 8050. 8010. 7980. 7940. 7900.785k
0.7730.7690.7660.7620.7580.7540.7500.7460.7427750.771
0.7680.7640.7600.7560.7520.7480.7447700. 7660. 7620. 7580. 7540. 7500. 7467750.7720.7680.7640.76Q0.7560.7520.748o. 8140. 8110. 8070. 8030, 80o0. 796lo. 7920. 7890. 7850.7749
700.7660.7620.7580.7540.750
0. 8160. 8130. 8090. 8050. 8020. 7980. 794b.0.7790.7760.7720.7680.7640.7600.7560.7527910.7870. 783k
l0. 81 80. 8150. 811lo. 8080. 8040. 80o0. 796l0. 7930. 7890. 7850. 7820. 7780. 774l0. 7700. 7660. 7620. 7580. 7540. 8200. 8170. 8130. 8100. 8060. 8020. 7990. 7950. 7910.7870. 7830. 7800. 7760. 7720. 7680. 7640.7600. 7560. 8230. 8190. 8150. 8120. 8080. 8040. 8010. 797. 7930. 7890. 7850.0. 8250. 8210. 8170. 814j0. 8100. 8060. 80307990.795
78/0. 7740. 7700. 7660. 7620. 758.7910.7880. 7840.780.7760. 7720. 7680. 764i0. 760o. 8270, 8230. 8190. 8160. 8120. 8080. 8050. 8010. 7970. 7930. 7900. 7860. 7820. 7780. 7740. 7700. 7660. 762B
Appendix)
Correction coefficient table
(This table uses sulfuric acid (1+1000) as the blocking liquid) ）23
GB/T 3286.9—1998
0. 708 0. 7040. 7000. 69610. 6920. 6870. 6830. 6780. 6740. 6690. 6640. 6590. 6540. 6490. 6440 . 6390. 6330. 6280. 6220. 6160. 710 o. 706 0. 7020. 698l0. 6940. 6890. 6850. 6800. 676l0. 671l0. 6660. 6610. 6560o. 6510. 6460. 6400. 6350. 6290. 6240. 6180.712
0.7080.7040.7000.6950.6910.6870.6820.70. 6730. 6680. 6
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6650.6600.6550.6500.6440.6390.6330.6270.6220. 716 0.712l0. 7080. 7040.6990. 695l0. 6910. 6860. 6810.6770. 6720. 6670. 6620. 6570. 6510. 6460. 6410. 6350. 6290. 6230. 718 0. 714 0. 7100. 7060. 7010.970.6930.6880.6830.6780.6740.66900. 6640. 6590. 6530. 6480. 6420. 6370. 6310. 6250.7200.7160.7120.7080.7030.6990.6940.6900.6850.6800.6660.6600.6550.6500.6440.6390.6330.6276760.6710 | 718 0. 7140. 7100. 7050. 701o. 6960. 6920. 6870. 6820. 6770. 6720. 6670. 6620. 6570. 6520. 6460. 6410. 6350. 6290. 724 0. 720 0. 7160. 7110. 7070. 7030. 6980. 6940. 6890. 6840. 6790..6590.6540.6480.6420.6370.631.6740.6690.6640.
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