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GB/T 6730.21-2016: Iron ores -- Determination of manganese content -- Potassium periodate spectrophotometric method
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 6730.21-2016	English	199	Add to Cart	3 days [Need to translate]	Iron ores -- Determination of manganese content -- Potassium periodate spectrophotometric method
GB/T 6730.21-1986	English	239	Add to Cart	3 days [Need to translate]	Methods for chemical analysis of iron ores. The potassium periodate photometric method for the determination of manganese content

GB/T 6730.21-2016: Iron ores -- Determination of manganese content -- Potassium periodate spectrophotometric method

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Iron ores - Determination of manganse content - Potassium periodate spectrophotometric method ICS 73.060.10 D31 National Standards of People's Republic of China Replacing GB/T 6730.21-1986 Determination of manganese content in iron ore Potassium periodate spectrophotometry Ironores-Determination ofmangansecontent- 2016-10-13 released 2017-09-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released

Foreword

GB/T 6730 "iron ore" is divided into dozens of parts. This part is part 21 of GB/T 6730. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part of the GB/T 6730.21-1986 "iron ore chemical analysis method potassium periodate potassium spectrophotometric determination of manganese", this part and GB/T 6730.21-1986 compared to the editorial changes, the main technical changes are as follows. --- increase the warning, normative reference documents, test reports; --- to modify the system requirements; --- modified manganese standard solution preparation; --- modified the number of measurements and the number of statements; --- modified the amount of acid decomposition of the sample; --- modified the calculation of the results of the formula; --- modify the allowable difference. This part is made by China Iron and Steel Industry Association. This section is headed by the National Commission on Standardization of Iron Ore and Direct Reductive Iron (SAC/TC317). This part of the drafting unit. Anshan Iron and Steel Mining Group, Shougang Technology Research Institute, Anshan Iron and Steel Co., Ltd., Benxi Iron and Steel (Group) Co., Ltd. Division, Changsha Institute of Mining and Metallurgy Co., Ltd., Metallurgical Industry Information Standards Institute. The main drafters of this part. Shen Hengchang, Chen Zhihua, Gao Jingjun, Sun Deming, Wang Dan, Ma Caiyun, Zhang Lei, Chen Zhibin. This part of the previous version of the standard to replace the release of the situation. --- GB/T 6730.21-1986. Determination of manganese content in iron ore Potassium periodate spectrophotometry WARNING - Personnel using this section should have formal laboratory experience. This section does not indicate all possible security issues. user Have the responsibility to take appropriate safety and health measures and to ensure compliance with the conditions set forth in the relevant national regulations.

1 Scope

This part of GB/T 6730 specifies the potassium iodide spectrophotometric method for the determination of manganese content. This part is applicable to the determination of manganese content in iron ore, iron concentrate, sinter and pellet. Measurement range (mass fraction). 0.050% ~ 5.00%.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. GB/T 6682 Analytical laboratory water specifications and test methods Preparation of pre - dried samples for analysis of iron ore GB/T 6730.1 Marking and Judgment of Numeric Ratification Rule and Limit Value of GB/T 8170 GB/T 10322.1 Iron Ore Sampling and Sample Preparation GB/T 12806 laboratory glass instrument single standard line capacity bottle GB/T 12807 Laboratory glass instruments - Index pipettes

3 principle

Samples with hydrochloric acid, nitric acid decomposition, add sulfuric acid evaporation to remove hydrochloric acid, filtration, the filtrate as the main liquid preservation. The residue is treated with hydrofluoric acid, coke sulfur Potassium melted, combined with the main liquid. In sulfuric acid, phosphoric acid medium, in the heating conditions, with potassium periodate oxidation of bivalent manganese for the purple red manganese Acid, the sodium nitrite reduction of the same measured solution as a reference, at a wavelength of 530nm, measured its absorbance, thereby measuring the manganese content.

4 reagent

In the analysis, unless otherwise specified, only approved analytical reagents and distilled water in accordance with GB/T 6682 or equivalent to its purity Of water. 4.1 potassium pyrophosphate. 4.2 potassium periodate. 4.3 Hydrochloric acid, ρ = 1.19 g/mL. 4.4 nitric acid, ρ = 1.42 g/mL. 4.5 hydrofluoric acid, ρ = 1.15 g/mL. 4.6 sulfuric acid, 1 1. ...