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GB/T 8704.7-2009: Ferrovanadium -- Determination of phosphorus content -- The molybdenum blue photometric method
Status: Valid GB/T 8704.7: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 8704.7-2009 | English | 139 |
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Ferrovanadium -- Determination of phosphorus content -- The molybdenum blue photometric method
| Valid |
GB/T 8704.7-2009
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| GB/T 8704.7-1994 | English | 199 |
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Methods for chemical analysis of ferrovanadium. The molybdenum blue photometric method for the determination of phosphorus content
| Obsolete |
GB/T 8704.7-1994
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PDF similar to GB/T 8704.7-2009
Basic data | Standard ID | GB/T 8704.7-2009 (GB/T8704.7-2009) | | Description (Translated English) | Ferrovanadium -- Determination of phosphorus content -- The molybdenum blue photometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H11 | | Classification of International Standard | 77.100 | | Word Count Estimation | 6,610 | | Date of Issue | 2009-07-15 | | Date of Implementation | 2010-04-01 | | Older Standard (superseded by this standard) | GB/T 8704.7-1994 | | Quoted Standard | GB/T 4010 | | Regulation (derived from) | National Standard Approval Announcement 2009 No.9 (Total No.149) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the use of molybdenum blue spectrophotometric determination of vanadium iron phosphorus content. This section applies to the determination of vanadium iron phosphorus content. | GB/T 8704.7-2009: Ferrovanadium -- Determination of phosphorus content -- The molybdenum blue photometric method
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Ferrovanadium.Determination of phosphorus content.The molybdenum blue photometric method
ICS 77.100
H11
National Standards of People's Republic of China
Replacing GB/T 8704.7-1994
Determination of phosphorus content of ferrovanadium
Molybdenum blue spectrophotometric method
Posted 2009-07-15
2010-04-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This Part replaces GB/T 8704.7-1994 "spectrophotometric determination of the amount of phosphorus chemical analysis of ferrovanadium molybdenum blue."
This portion of the GB/T 8704.7-1994 comparison, the main changes are.
--- After the sample is dissolved insoluble residue filtered washings from "warm" to "warm dilute nitric acid";
--- Will increase the amount of ammonia over by "5mL", to "10mL" precipitation;
--- Amount of carrier solution of ferric chloride was added by precipitation was added 100g/L of ferric chloride solution 5mL or 8mL, to join
50g/L of ferric chloride solution 8mL;
--- The calibration curve is added to the amount of the ferric chloride solution was added a solution of ferric chloride 100g/L of 2mL, was added to 50g/L of
Ferric chloride solution 5mL;
--- When the calibration curve "to blank zero" to "to correspond to the reference zero";
--- Measurement range from "< 0.25%" is replaced by "0.010% to 0.25%."
This part is proposed by the China Iron and Steel Association.
This part of pig iron and ferroalloy by the National Standardization Technical Committee.
This section is drafted. Sichuan Investment Emei Ferroalloy (Group) Co., Ltd.
The main drafters of this section. should Tang Hua, Fang Yan, Wu Cuiping.
This part of the standard replaces the previous editions are.
--- GB/T 8704.7-1994.
Determination of phosphorus content of ferrovanadium
Molybdenum blue spectrophotometric method
Warning --- Use this section shall be a person experiences regular laboratory work. This section does not point out all possible security asked
question. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.
1 Scope
This section GB/T 8704 provisions of the molybdenum blue spectrophotometric determination of vanadium iron phosphorus content.
This section applies to the determination of phosphorus in ferro-vanadium. Measurement range (mass fraction). 0.010% to 0.250%.
2 Normative references
The following documents contain provisions cited by GB/T 8704 to the present, constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
GB/T 4010 alloy chemical analysis and preparation of samples
Principle 3
Sample with nitric acid, hydrochloric acid decomposition, oxidation of vanadium used in the ammonia medium, while phosphorus precipitation in the form of iron phosphate, was isolated by filtration. With
The precipitate dissolved in nitric acid, perchloric acid after white smoke, sodium bisulfite reduced iron, phosphorus and ammonium molybdate, hydrazine sulfate produced by the reaction of phosphorus molybdenum blue,
825nm wavelength measured absorbance on a spectrophotometer. On the calibration curve Richard mass of phosphorus, calculated the sample of phosphorus
content.
4 Reagents and materials
Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled water or its equivalent purity water.
4.1 nitric acid, ρ1.42g/mL.
4.2 hydrochloride, ρ1.19g/mL.
4.3 perchloric acid, ρ1.67g/mL.
4.4 Hydrogen peroxide, ρ1.10g/mL.
4.5 ammonium hydroxide, ρ0.90g/mL.
Nitrate 4.6, 1 + 2.
Nitrate 4.7, 1 + 50.
Sulfate 4.8, 1 + 1.
4.9 sodium bisulfite solution, 100g/L. Weigh 50g of sodium bisulfite (of NaHSO3) into 600mL beaker was added 500mL
Dissolved in water, and mix.
4.10 ferric chloride solution, 50g/L. Weigh 5g of ferric chloride (FeCl3 · 6H2O), placed in 400mL beaker, add 10mL hydrochloric acid
(1 + 1) and 90mL water to dissolve and mix.
4.11 chromogenic reagent solution
4.11.1 ammonium molybdate solution, 20g/L. Weigh 20g of ammonium molybdate [(NH4) 6Mo7O24 · 4H2O] was dissolved in warm water to about 100mL,
Sulfuric acid was added 700mL (4.8) after cooling was diluted with water to 1000mL, and mix.
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