GB/T 30728-2014 English PDF

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GB/T 30728-2014: Determination of nitrogen in solid biofuels
Status: Valid

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GB/T 30728-2014	209	Add to Cart	3 days	Determination of nitrogen in solid biofuels	Valid

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Basic data

Standard ID: GB/T 30728-2014 (GB/T30728-2014)
Description (Translated English): Determination of nitrogen in solid biofuels
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D21
Classification of International Standard: 75.160.10
Word Count Estimation: 9,993
Date of Issue: 6/9/2014
Date of Implementation: 10/1/2014
Quoted Standard: GB/T 21923
Regulation (derived from): National Standards Bulletin No. 11 of 2014
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 method principle, reagents, instruments and equipment of solid biomass fuel nitrogen determination, the determination step, the results of the calculation and precision of the method. This Standard applies to all kinds of solid

GB/T 30728-2014: Determination of nitrogen in solid biofuels

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Determination of nitrogen in solid biofuels ICS 75.160.10 D21 National Standards of People's Republic of China Determination of solid biomass fuel nitrogen Issued on. 2014-06-09 2014-10-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Introduction Ⅲ 1 Scope 1 2 Normative references 1 Principle 3 Method 1 4 Reagent 1 5 Equipment 2 6 measuring step 4 7 blank test 4 8 4 Calculation Results 9 precision of the method 5 10 Test Report 5

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. The standard proposed by China Coal Industry Association. This standard coal by the National Standardization Technical Committee (SAC/TC42) centralized. This standard was drafted. CCRI Detection Research Branch. The main drafters of this standard. Sun Gang, Xing Xiuyun, Wu Zengli. Determination of solid biomass fuel nitrogen

1 Scope

This standard specifies the method principle, reagents, equipment of solid biomass fuel nitrogen measurement, the measuring step, and the results of the calculation method Precision. This standard applies to all kinds of solid biomass fuel.

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 21923 Test code for solid biomass fuels

3 PRINCIPLE OF THE METHOD

Weigh a certain amount of air-dried sample of solid biomass fuels, added to the mixed catalyst and sulfuric acid, thermal decomposition, nitrogen is converted to hydrogen sulfate Ammonium. Excess sodium hydroxide solution was added, ammonia was distilled off and absorbed in the boric acid solution. Titrated with standard solution of sulfuric acid, according to the use of sulfuric acid Amount, calculate the content of solid biomass fuel nitrogen.

4 Reagents

Unless otherwise indicated, used in the analysis confirmed analytically pure reagents and distilled or deionized water or equivalent purity. 4.1 anhydrous sodium carbonate. sodium carbonate purity reagent or reference standard material. 4.2 sucrose. 4.3 mixed catalyst. anhydrous sodium sulfate, sulfuric acid, mercury and chemically pure selenium powder mass ratio (64101) mixing (such as sulfuric anhydride 32g Sodium, 5g mercury sulfate and selenium powder mixed 0.5g), finely and mix and reserve. 4.4 sulfate. density 1.84g/cm3. 4.5 ethanol. mass fraction of 95% and above. 4.6 mixed alkali solution. 370g of sodium hydroxide and sodium sulfide 30g dissolved in water to prepare a solution of 1000mL. 4.7 boric acid solution. about 30g/L. 30g of boric acid dissolved in 1L of water, heated to dissolve the preparation, insoluble matter was filtered off after cooling. 4.8 Standard Solution. c 12H2SO ÷ 4 ≈0.025mol/L. Preparation of standard solution of sulfuric acid. add about 40mL of water in a beaker with Pipette 0.7mL of sulfuric acid (see 4.4) slowly added to the beaker, and then the solution was transferred to 1000mL volumetric flask, dilute with water to Scale, thoroughly shaken evenly. Calibration standard solution of sulfuric acid. the conical flask Weigh 0.02g (weighing accuracy of 0.0002g) in advance at 130 ℃ Dried to a constant mass of anhydrous sodium carbonate (see 4.1), was added 50mL ~ 60mL of water to dissolve, then add 2 to 3 drops of methyl orange indicator Agents (see 4.9), with a standard solution of sulfuric acid titration to change from yellow to orange. Boil to expel carbon dioxide, after cooling, continue titration to orange. According to equation (1) to calculate the concentration of the standard solution of sulfuric acid. The concentration of sulfuric acid standard solution calibration takes two people, each doing four times per repeat calibration weight 8 times Complex calibration results poor no more than 0.00060mol/L, its arithmetic mean concentration of sulfuric acid as a standard solution, a 4-bit effective number ......

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