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GB/T 216-2003 PDF English

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GB/T 216-2003: Determination of phosphorus in coal
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GB/T 216: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 216-2003English70 Add to Cart 0-9 seconds. Auto-delivery Determination of phosphorus in coal Valid
GB/T 216-1996English239 Add to Cart 2 days Determination of phosphorous in coal Obsolete
GB 216-1982English199 Add to Cart 2 days Determination of phosphorus in coal Obsolete

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GB/T 216-2003: Determination of phosphorus in coal

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GB ICS 73.040 D 21 NATIONAL STANDARD Replacing GB/T 216-1996 Methods for determination of phosphorus content in coal (ISO 622.1981, Solid mineral fuels - Determination of phosphorus content – Reduced molybdophosphate photometric method, NEQ) Issued on. JULY 01, 2003 Implemented on. NOVEMBER 01, 2003 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China

Table of Contents

Foreword... 3 1 Scope... 4 2 Normative references... 4 3 Abstract of methods... 4 4 Reagents... 4 5 Instruments and equipment... 5 6 Determination methods... 5 7 Precision... 7 8 Test report... 8

Foreword

This Standard corresponds to ISO 622.1981 Solid mineral fuels - Determination of phosphorus content – Reduced molybdophosphate photometric method (English edition). This Standard is not equivalent to ISO 622.The main differences between this Standard and ISO 622 are as follows. - Delete the wet oxidation process in decomposition method of samples. Only adopt dry oxidation process. - Add method “directly measure the mass of coal sample, then re-ashing”. This Standard replaces GB/T 216-1996 Methods for determination of phosphorus content in coal. Compared with GB/T 216-1996, main changes of this Standard are as follows. - Delete Appendix A “Ash decomposition methods for hydrochloric - perchlorate” (1996-edition). This Standard was proposed by China National Coal Association. This Standard shall be under the jurisdiction of National Technical Committee on Coal of Standardization of China. Drafting organizations of this Standard. China Coal Research Institute-Coal analysis laboratory, and Team 143 of Yunnan Coalfield Exploration Company. Main drafters of this Standard. Zhang Kerui, and Ma Zunmei. This Standard replaces the following historical editions. GB 216-63; GB 216-82; GB/T 216-1996. Methods for determination of 4.1 Hydrofluoric acid (GB/T 620). 40% (mass fraction). 4.2 Sulfuric acid solution. c(1/2H2SO4)=10mol/L. Measure 278mL of concentrated sulfuric acid (GB/T 625). Put them into appropriate amount of water slowly. Stir it while adding. Then dilute with water to 1000mL. 4.3 Sulfuric acid solution. c(1/2H2SO4)=7.2mol/L. Measure 200mL of concentrated sulfuric acid. Put them into appropriate amount of water slowly. Stir it while adding. Then dilute with water to 1000mL. 4.4 Ammonium molybdate-sulfuric acid solution. dissolve 17.2g of ammonium molybdate (GB/T 657) in appropriate amount of sulfuric acid solution (4.3). Dilute it with sulfuric acid solution (4.3) to 1000mL. 4.5 Ascorbic acid solution. measure 5g of ascorbic acid. Dissolve them in 100mL of water. Prepare it when it will be used. 4.8 Phosphorus standard stock solution (0.1mg/mL). accurately measure 0.4392g of mono potassium phosphate GR (GB/T 1274) that has been dried for 1h under 110°C. Dissolve them in water. Dilute with water to 1000mL. 4.9 Phosphorus standard stock solution (0.01mg/mL). measure 10.0mL of phosphorus standard stock solution (4.8). Dilute with water to 100mL. Prepare it when it will be used. 5.1 Analytical balance. sensitivity is 0.1mg. 5.2 Muffle. attached with thermostat and chimney. It can keep the temperature between (815±10) °C. 5.3 Spectrophotometer or photoelectric colorimeter. 5.4 Platinum or tetrafluoroethylene crucible. volume is 25mL~30mL. 5.5 Volumetric flasks. 50mL, 100mL and 1000mL. 6.1 Method A (weighing ashing sample) 6.1.1 Sample treatment 6.1.1.1 Ashing of coal sample. Ash the coal sample under slow speed method in compliance with the provisions in GB/T 212.Then it is crushed through 0.1mm sieve. 6.1.2 Preparation of sample blank solution Prepare a sample blank solution when decomposing a batch of samples. The method of preparation is the same as 6.1.1.2, without adding ashing sample. 6.1.3 Determination procedure 6.2 Method B (weighing coal sample) 6.2.1 Sample treatment 6.2.2 Preparation of blank solution. the same as 6.1.2. 6.2.3 Determination procedure. the same as 6.1.3. 6.2.4 Result calculation The mass fraction of phosphorus Pad (%) in air-dried coal sample is calculated according to Formula (2). ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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