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SN/T 0481.2-2011: Inspection of bauxite for import and export. Part 2: Determination of silicon dioxide content Molybdenum blue spectrophotometric method
Status: Valid SN/T 0481.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| SN/T 0481.2-2011 | English | 159 |
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Inspection of bauxite for import and export. Part 2: Determination of silicon dioxide content Molybdenum blue spectrophotometric method
| Valid |
SN/T 0481.2-2011
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| SN/T 0481.2-1995 | English | 199 |
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Method for inspection of bauxite for export. Determination of silicon dioxide content--Molybdenumbule spectrophotometric method1995-09-06
| Obsolete |
SN/T 0481.2-1995
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PDF similar to SN/T 0481.2-2011
Basic data | Standard ID | SN/T 0481.2-2011 (SN/T0481.2-2011) | | Description (Translated English) | Inspection of bauxite for import and export. Part 2: Determination of silicon dioxide content Molybdenum blue spectrophotometric method | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | D54 | | Word Count Estimation | 6,650 | | Date of Issue | 2011-05-31 | | Date of Implementation | 2011-12-01 | | Older Standard (superseded by this standard) | SN/T 0481.2-1995 | | Quoted Standard | GB/T 2007.1; GB/T 2007.2; GB/T 2009; GB/T 6379.1; GB/T 6682 | | Regulation (derived from) | National-Quality-Inspection-accreditation (2011) 291 | | Issuing agency(ies) | General Administration of Customs | | Summary | This standard specifies the spectrophotometric method and export bauxite silica content. This section applies to the determination of the import and export of alumina silica. Side of the given range (mass fraction): 0. 2% to 15%. | SN/T 0481.2-2011: Inspection of bauxite for import and export. Part 2: Determination of silicon dioxide content Molybdenum blue spectrophotometric method
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Inspection of bauxite for import and export Part 2. Determination of silicon dioxide content Molybdenum blue spectrophotometric method
People's Republic of China Entry-Exit Inspection and Quarantine Standards
Instead of the SN/T 0481.2-1995
Importers alumina test methods
Part 2. Determination of silica content
Molybdenum blue spectrophotometric method
Part 2. Determinationofsilicondioxidecontent
Issued on. 2011-05-31
2011-12-01 implementation
People's Republic of China
The State Administration of Quality Supervision, Inspection and Quarantine released
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Foreword
SN/T 0481 "Importers alumina test methods" standard series is divided into 12 parts.
--- Part 1. mandelic acid with concealed titanium aluminum oxide content of EDTA;
--- Part 2. Determination of silicon dioxide content - Molybdenum blue spectrophotometric method;
--- Part 3. sulfosalicylic acid spectrophotometric determination of the amount of ferric oxide;
--- Part 4. Direct determination with EDTA calcium oxide and magnesium oxide content;
--- Part 5. combustion - neutralization method for the determination of sulfur content;
--- Part 6. Rapid Determination of bulk density bauxite;
--- Part 7. Determination of ferric oxide, titanium oxide, silicon dioxide, calcium oxide spectrometry inductively coupled plasma atomic emission,
MgO content;
--- Part 8. High Frequency Burning - Determination of sulfur content infrared absorption method;
--- Part 9. 1,10 phenanthroline photometric method for the determination of free iron content;
--- Part 10. silicon dioxide, ferric oxide, aluminum oxide, calcium oxide, magnesium oxide, potassium oxide, silica and phosphorus pentoxide
Determination of Titanium X-ray fluorescence spectrometry;
--- Part 11. Determination of titanium dioxide content of hydrogen peroxide spectrophotometry;
--- Part 12. Determination of porosity and water absorption.
This section SN/T 0481 "Importers alumina test methods" series of standards - Part 2.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This section is amended to SN/T 0481.2-1995's.
Section compared with the SN/T 0481.2-1995 The main changes are as follows.
--- Increased Chapter 2, "Normative references";
--- Measurement range from "less than 8%," expanded to "less than 15%";
--- Mixed flux of anhydrous sodium carbonate or anhydrous potassium carbonate, boric acid (SN/T in 0481.2 3.1) instead of anhydrous potassium carbonate and borax
(In this section 4.1);
--- Fixed original sample weight 0.5g ± 2mg (SN/T in 0481.2 6.2) adds another option. 0.2g ± 2mg (this
Section 7.1);
--- According to GB/T 1.1 requirements for standard text made editorial changes.
This section proposed and managed by the National Certification and Accreditation Administration Committee.
This section is drafted. Tianjin People's Republic of China Exit Inspection and Quarantine.
The main drafters of this section. From Madrid, Chen Yan, Chan Kwong Chi, Wei Hongbing, Feng Yuxin, Wang Hong, Su Mingyue.
This part replaces part of the previous editions are.
--- SN/T 0481.2-1995.
Importers alumina test methods
Part 2. Determination of silica content
Molybdenum blue spectrophotometric method
1 Scope
This section specifies the spectrophotometric method Importers alumina silica content.
This section applies to the determination of the import and export of alumina silica. Measurement range (mass fraction). 0.2% to 15%.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 2007.1 bulk minerals sampling and sample preparation General manual sampling methods
GB/T 2007.2 bulk minerals sampling and sample preparation General manual sample preparation method
GB/T 2009 bauxite bulk sampling and sample preparation method
GB/T 6379.1 measurement methods and results of Accuracy (trueness and precision) Part 1 General principles and definitions
(GB/T 6379.1-2004, ISO 5725-1.1994, IDT)
GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)
3 Method summary
After the sample was mixed with molten flux, nitric acid - sulfuric acid leach mixing silicon into solution in the form of orthosilicate, under certain acidity adding molybdic acid
Ammonium silicon so that a yellow molybdic acid, and then increase the acidity of ferrous restore them to molybdenum blue with oxalic acid eliminates iron, phosphorus, arsenic, spectrophotometric
Determination.
4 Reagents
Analysis Unless otherwise stated, use only analytical reagent, water should comply with GB/T 6682 in three of water.
4.1 mixed flux. anhydrous potassium carbonate and anhydrous borax mass ratio (1/1) grind to a fine powder, stored in the grinding jar.
4.2 nitric acid (ρ = 1.42g/mL).
4.3 sulfate (ρ = 1.84g/mL).
4.4 nitric acid - sulfuric acid mixed solution of 1. nitric acid aqueous sulfuric acid = 10,012,188.
4.5 nitric acid - sulfuric acid mixed solution of 2. Measure 30mL of nitric acid - sulfuric acid mixed solution of 1 (4.4) was diluted with water to 1L shake.
4.6 ammonium molybdate solution (50g/L). Weigh 5g of ammonium molybdate was dissolved in water, diluted with water to 100mL, using now.
4.7 sulfate (11).
4.8 sulfate (13).
4.9 oxalic acid solution (50g/L).
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