HG 2956.1-1982 Boron and Magnesium Ore Analysis Rules HG2956.1-1982 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
Analytical nufe for ascharite ores
Analytical nufe for ascharite ores This rule applies to the following analytical method standards: GB3447.3-82 Analysis method for the content of diboron trioxide in ascharite ores; GB3447.4-82 Analysis method for the content of total iron in ascharite ores; (GB3447.5-82 Analysis method for the content of ferrous oxide in ascharite ores; GB3447.6-82 Analysis method for the content of calcium oxide and magnesium oxide in ascharite ores; G3447.7-82 Analysis method for the content of acid insoluble matter in ascharite ores; GB3447.8-82 Analysis method for the loss on ignition of ascharite ores. 1 Rule
C549: 732
.1: 543
HG/T2956.1-1982 (1997)
Replace GB3447.T-82
1.1 The method contained in the standard is used to test the quality of boron and magnesium ore products, arbitration analysis, verification of other daily analysis methods and preparation of standard samples.
1.2 The analysis samples shall be collected and prepared in accordance with GB3447.2-82 "Collection and Preparation Methods for Analysis of Boron and Magnesium Ore". The weighed samples shall be dried at 105-110℃ to constant weight. 1.3 The accuracy level of the weighing balance shall be The sensitivity should not be lower than grade three, and the sensitivity should reach 0.1 mg. The burettes, containers, pipettes and other volumetric instruments should be calibrated regularly. 1.4 The reagents used for determination, unless otherwise specified, should generally be analytically pure reagents that meet national standards (CB) or departmental standards (HG). Reference reagents should be used as bases. When metals are used to prepare standard solutions, their purity should be above 99.9%. 1.5 The liquid reagents listed in the standards are concentrated solutions of the reagents unless otherwise specified. 1. The water used in the analysis process refers to distilled water or ion exchange water. 1.7 The solutions prepared in the standards are all aqueous solutions except those where the solvent is specified. 1.8 The concentration of non-standard solutions prepared from liquid reagents is expressed as the volume of the concentrated solution plus the volume of water. For example, a 1+2 hydrochloric acid solution refers to 1 unit volume of hydrochloric acid with a ratio of 1.19 mixed with 2 units of the same volume of water. 1.9 The percentage concentration of non-standard solutions prepared from solid reagents refers to the number of grams of solute contained in 100 ml of solution. 1.10 Application of reference reagent standards When determining the concentration of a solution, three portions should be calibrated at the same time, and the relative error between the maximum and minimum values ​​of the obtained concentration shall not exceed 0.2%.
1.11 The "burning or drying to constant weight" in the standard, unless otherwise specified, means that the burning or drying and cooling procedures are repeated until the difference in the last weighing is no more than 0.0003 grams, and the last re-display is taken as the basis for calculation. 1.12 The "dry filtration" in the standard means that the solution is filtered into a dry container with dry filter paper and a funnel, and the initial partial filtration is performed. bZxz.net
1.13 The hot water or hot solution used in the analysis process refers to a temperature of 60-70℃; the hot water or warm solution used refers to a temperature of 40-50r.
1.14 Toxic and foul-smelling gases generated after evaporation should be carried out in a fume hood: 1.15 All analyses in the standard must be tested in an airtight manner for all operations, and the measurement results must be corrected. 1.16 The conversion factors, equivalent liquid concentrations and molar concentrations in the standard should be rounded to four significant figures. The number of decimal places in the analytical result should be the same as the number of decimal places in the allowable error stated in the analytical method. Issued by the State Bureau of Standards on December 30, 1982
Implementation on October 1, 1983
..comHC/F2956.1--1982 (1997)
1.17 The rounding off method shall be in accordance with the rounding off rules in Appendix C of (B1.1-81 (General Provisions for the Preparation of Standards in the Guidelines for Standardization)).
1.18 The allowable errors of the analytical methods stated in the standard are all absolute errors. 1.19 When the same laboratory uses this standard, parallel determinations shall be made for each analysis of the same sample. When the difference between the two results does not exceed twice the absolute value of the allowable error for the same test rate specified in this standard, the arithmetic mean shall be taken as the analytical result. Otherwise, the second analysis shall be performed. Analyze, take the two results with the smallest difference but not exceeding the specified allowable error range, and average them as the analysis result. If the third analysis result cannot meet the requirements, all the previous results should be discarded, the reasons should be checked, and the analysis should be repeated. 1.20 When two laboratories use this standard to analyze the same sample, the difference in their results should not exceed twice the allowable error value of different test cases. In case of dispute, the two parties may negotiate and select a unit to conduct arbitration analysis, and the arbitration analysis results shall be used as the basis for deduction. Additional notes:
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China and is under the jurisdiction of the Chemical Industry Mining Design and Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Chemical Industry Mining Design and Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Shi Shuming and Chen Dulin.
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