HG/T 2956.3-2001 Determination of Boron Trioxide Content in Boron Magnesium Ores Volumetric Method HG/T2956.3-2001 Standard Download Decompression Password: www.bzxz.net

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Chemical Industry Standard of the People's Republic of China
HG/T 2956.2~2956.82001
Analytical methods for ascharite ores2002-01-24Promulgated
2002.0701Implementation
Promulgated by the State Economic and Trade Commission
Document No.: 10100—2002
HG/T2956.3—2001
The standard is the confirmatory chemical industry standard HG/T2956.3-982Analytical method for the content of magnesium dichloride in ascharide. The following are the provisions:
Record A, Appendix 3 of this standard is the appendix of the standard: This standard starts from the actual screening and replaces IIG/T29G, 3-1 at the same time. This standard was issued by the former State Administration of Industry and Commerce of China and the Department of Policy and Regulation. The responsible unit for drafting this standard is the Ministry of Chemical Industry International Standardization Technical Committee. The main authors of this standard are Shang Heping and Zhang Yaomei. This standard was first issued in 1986 as the Ministry of Chemical Industry standard HG13526S "Uniform analysis method for ascharite"; in 1982 it was issued as the national standard GB3417.3-82 "Analysis method for the content of diboron trioxide in magnesium ore"; in 1997 it was adjusted to a recommended chemical industry standard, and the original national standard GB5447.3-82 was discontinued and renumbered as H6/T2656.3-192. Scope Chemical Industry Standard of the People's Republic of China Determination of Boron Trihydride Content in Ascharite Ores Volumetric Method Determination of Boron Trihydride by Volumetric Method This standard recommends the determination of Boron Trioxide Content by calcined or calcined method. This standard is used to determine the content of dioxo in magnesium ore products. 2 Reference standards
HG/T2956.3-2001
Reference #H256.31552
The following standards contain provisions that will become the provisions of this standard through reference in this standard. When this standard is published, the versions indicated are effective immediately. All standards are subject to revision. Parties that agree with this standard should discuss the possibility of using new versions of the following standards. CR/T601·1988 Chemical reagents for quantitative analysis (volume analysis) Preparation of standard solutions GB/T532-1 Specifications and test methods for water for analytical tests5L of aldehyde concentrate was diluted with water to 1 mol/ml. 4.7 Sodium hydroxide titration solution: (NaOH)-1.15 mol/ml. Preparation and implementation in accordance with CB/1631. Www.bzxZ.net
4.B Cresol green-cresol green indicator solution 0.CAg cresol green, (1.0% benzoic acid red solution) diluted to 10FmL in ethanol. 4.9 Indicator solution: 10B/1.5 ethanol solution. Approved by the National Economic and Social Commission on January 24, 2002 and implemented on July 1, 2002
5 Instruments and equipment || tt||Test and break device, as shown in Figure 1.
HG/T2956.32001
1-Push-type bottle. Reporting density)
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6 Sample
Try to pass through 12%um test sieve (GB/T6003.1) + 10~-113℃ dry for 2h, place in a desiccator to cool the rate room for analysis step
7. Weigh the sample in a sample box (up to 0.1-0.3 g), and add a 15-mL (.2-0.2-0.3-0.10-0.2 ... Heat the micro-strip for 2 minutes. Heat the paper and wash the filtrate with 500 mL of conical energy-saving filter with burning water until there is no chloride ion in the filtrate (use nitric acid to check): add Class A benzene red indicator solution to the filtrate, add 1-2 drops of hydrochloric acid monohydrate (4.2), heat and exhaust carbon monoxide. 7.4 After the solution is cooled, use sodium hydroxide standard titrator to adjust the pH to 5.1 (pH should be 5.1). This is the starting point of determination, add 13 drops of acid ether indicator solution, 2g of ethanol: titrate with sodium hydroxide standard titration solution until the solution changes from green to gray, then add 6.5 g of ethanol. If it changes to green, continue to add gray, repeat this operation until the gray does not disappear after adding H group. 7.5 When measuring with the sample, do a blank test.
14. For daily production, the conversion reaction can be used instead of the Gan area training. After the test is set until the green changes to a yellow, add 5ml. Straight package 5: a delay, the factory inspection and supervision and household division must be certified! For the preparation of the conversion preparation, see the attached requirements. 2 oxidation of a special benefit of 253, must be separated from the public share, as shown in the special requirements of H. 8. Expression of analytical results: The direct formula (X) expressed as a percentage of the original chemical: X_-(VV)xo. C34 8. Formula f—the theoretical concentration of sodium hydroxide standard solution, mo./[3
HC/I 2956. 3
V——standard sodium hydroxide solution, added with sodium hydroxide solution, 2001
V—standard titration concentration of sodium hydroxide in air, mL; formula weight
0.034 81. Allowable difference
The amount of sodium hydroxide equivalent to 1.000mrl/] expressed in grams.
The arithmetic mean of the results of the half-analysis is the absolute difference of the results of the parallel analysis in the same laboratory. The absolute difference of the results of the analysis in different laboratories is not more than 0.25%. The absolute difference of the results of the analysis in different laboratories is not more than %.
A1 Reagents and solvents
A1.1 Sugar or H-granulated sugar,
A1.2 Carbon dioxide.
A1.3 Hydrochloric acid solution:H=0.05 ol/L succinic acid indicator sugar, 1CB/1. acetylcholine dissolving agent.
A2 Preparation Steps
Weigh 500g or white silica gel, place in 1090il. baking pan, add 350ml. water, heat under constant stirring to dissolve all: heat to filter, heat on the plate, cool to t under stirring, add 25r:T. acetic acid solution, continue to stir for 3-1min, add 95rmI hydrogen peroxide [A1.4) with appropriate amount of active ingredient, put on water for more than 25min to remove the color of the liquid: filter: dilute the liquid with water without iodine to 75UI, before use, use the prepared as an indicator, titrate the iodine drop (A1.5) until pink appears
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