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GB/T 6730.26-2017: Iron ores -- Determination of fluorine content -- Thorium nitrate titrimetric method
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GB/T 6730.26-2017	English	199	Add to Cart	3 days [Need to translate]	Iron ores -- Determination of fluorine content -- Thorium nitrate titrimetric method
GB/T 6730.26-1986	English	199	Add to Cart	2 days [Need to translate]	Methods for chemical analysis of iron ores. The thorium nitrate volumetric method for the determination of fluorine content

GB/T 6730.26-2017: Iron ores -- Determination of fluorine content -- Thorium nitrate titrimetric method

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Iron ores - Determination of content - Thorium nitrate titrimetric method ICS 73.060.10 D31 National Standards of People's Republic of China Replacing GB/T 6730.26-1986 Iron ores - Determination of fluorine content - Thorium nitrate titration method 2017-09-07 Posted 2018-06-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released

Foreword

GB/T 6730 "iron ore" is divided into dozens of sections. This section GB/T 6730 Part 26. This section drafted in accordance with GB/T 1.1-2009 given rules. This Part replaces GB/T 6730.26-1986 "Methods for chemical analysis of iron ores - Determination of fluorine content by thorium nitrate volumetric method". This section and GB/T 6730.26-1986 In comparison, except for some editorial changes, the main technical changes are as follows. --- Standard name was changed to "Determination of fluorine content of iron ore thorium nitrate titration method"; --- Added "warning" "range" "normative references" "equipment" "test report" Chapter and content, the original chapter number corresponding change; --- Thorium nitrate standard titration solution of fluoride titration units modified to mol per liter (mol/L), the calculation formula is modified accordingly; --- Increasing the thorium nitrate standard titration solution when the results of retention of the median requirements and poor control; --- Clear and standardized sample and sample preparation of the specific requirements; --- Standard "sample size" to "sample volume", and clear the weighing accuracy; --- Remove the original (2) of the coefficient "K" and "K" of the statement; --- Removed the table 1 "standard deviation allowed" one column, and "allowable difference" included in the "result calculation and its representation" chapter. --- "Acceptance of analytical value" changed to "determine the analysis results," the content has been modified accordingly. This part is proposed by China Iron and Steel Association. This part of the National Iron Ore and Direct Reduced Iron Standardization Technical Committee (SAC/TC317) centralized. This part of the drafting unit. Ningbo Inspection and Quarantine Science and Technology Research Institute. The main drafters of this section. Wang Yan, Liu Yongfeng, Chen Hehai, Yu Chunhui, Rong Defu, Qiu Zhijun, Zhang Feng. This part replaces the standards previously issued as. --- GB/T 6730.26-1986. Iron ores - Determination of fluorine content - Thorium nitrate titration method Warning --- personnel using this section should have formal laboratory work experience. This section does not indicate all possible safety issues question. It is the user's responsibility to take appropriate safety and health measures and to ensure compliance with the requirements of the relevant state laws and regulations.

1 Scope

GB/T 6730 provisions of this part of the thorium nitrate titration Determination of fluorine content. This section applies to the determination of natural iron ore, iron ore, sinter and pellet fluoride content. Measurement range (mass fraction). 2.00% ~ 15.00%.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 601 chemical reagent standard titration solution preparation GB/T 6682 analytical laboratory water specifications and test methods Preparation of pre-dried samples for iron ore analysis GB/T 6730.1 GB/T 8170 rounded repair rules and limit values of the representation and judgment GB/T 10322.1 Iron ore sampling and sample preparation methods GB/T 12805 Laboratory glassware burette GB/T 12806 laboratory glassware single standard line capacity bottle GB/T 12808 laboratory glassware single standard pipette

3 principle

Sample with perchloric acid and phosphoric acid at 130 ℃ ~ 140 ℃ by steam distillation, the separation of fluorine and co-existing elements, adjusting the pH 3.0 ~ 3.2 to Methyl thymol blue as an indicator, titration with thorium nitrate standard solution. To determine the amount of fluorine.

4 Reagents and materials

Unless otherwise indicated in the analysis, the use of only approved analytical reagent and in line with GB/T 6682 more than three distilled water or its The purity of water. 4.1 Sodium peroxide. 4.2 perchloric acid, ρ about 1.67g/mL. 4.3 Phosphoric acid, p about 1.70 g/mL. Hydrochloric acid, 1.200. 4.5 sodium hydroxide solution, 20g/L. ...