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GB/T 2441.3-2010 English PDF

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GB/T 2441.3-2010: Determination of urea -- Part 3: Water content -- Karl fischer method
Status: Valid

GB/T 2441.3: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 2441.3-2010English149 Add to Cart 2 days [Need to translate] Determination of urea -- Part 3: Water content -- Karl fischer method Valid GB/T 2441.3-2010
GB/T 2441.3-2001English199 Add to Cart 2 days [Need to translate] Determination of urea Determination water content Karl Fisher method Obsolete GB/T 2441.3-2001

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Basic data

Standard ID GB/T 2441.3-2010 (GB/T2441.3-2010)
Description (Translated English) Determination of urea -- Part 3: Water content -- Karl fischer method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G20
Classification of International Standard 65.080
Word Count Estimation 5,523
Date of Issue 2010-06-30
Date of Implementation 2011-01-01
Older Standard (superseded by this standard) GB/T 2441.3-2001
Quoted Standard GB/T 6283; HG/T 2843
Regulation (derived from) National Standard Approval Announcement 2010 No.2 (Total No.157)
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 determination of urea in water by the Karl Fischer method. This section applies to the determination of ammonia and carbon dioxide obtained urea synthesis moisture. Arbitration, using pyridine -containing Karl Fischer reagents.

GB/T 2441.3-2010: Determination of urea -- Part 3: Water content -- Karl fischer 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.
Determination of urea.Part 3. Water content.Karl fischer method ICS 65.080 G20 National Standards of People's Republic of China Replacing GB/T 2441.3-2001 Determination of urea Part 3. Moisture Fisher Fischer 2010-06-30 release 2011-01-01 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 2441 "Determination of urea method" is divided into the following nine parts. - Part 1. total nitrogen content; - Part 2. Biuret content spectrophotometric method; - Part 3. Moisture Fisher Fischer; - Part 4. Iron content - phenanthroline spectrophotometric method; - Part 5. Alkalinity volumetric method; - Part 6. Water insoluble content weight method; - Part 7. Particle size sieving method; - Part 8. Sulfate content visual turbidimetric method; Part 9. Spectrophotometric method for methylenediourea content. This part is part 3 of GB/T 2441. This part of the replacement GB/T 2441.3-2001 "Determination of moisture determination of moisture Karl Fischer method." This section is the main change compared with GB/T 2441.3-2001 as follows. --- removed ISO preface. This section is proposed by the China Petroleum and Chemical Industry Association. This section is under the jurisdiction of the National Technical Committee on Standardization of Fertilizers and Soil Conditioners (SAC/TC105). This part of the drafting unit. National Fertilizer Quality Supervision and Inspection Center (Shanghai). This part of the main drafters. Zhang Qiuzhen, room friends. This part of the previous version of the standard to replace the release of the situation. GB/T 2444-1981, GB/T 2444-1991, GB/T 2441.3-2001. Determination of urea Part 3. Moisture Fisher Fischer

1 Scope

This part of GB/T 2441 specifies the use of Karl Fischer method for the determination of moisture in urea. This part applies to the determination of urea moisture from ammonia and carbon dioxide synthesis. At the time of arbitration, the use of pyridine-containing Karl Fischer reagent.

2 normative reference documents

The terms of this document are the terms of this part by reference to this part of GB/T 2441. Any reference to the date of the text , All subsequent amendments (excluding corrigenda) or revisions do not apply to this part, however, encouragement under this section The parties to the agreement study whether the latest version of these documents can be used. For undated references, the latest edition of this document applies section. GB/T 6283 Determination of moisture content in chemical products Karl Fischer method (general method) HG/T 2843 chemical analysis of chemical fertilizers commonly used standard titration solution, standard solution, reagent solution and indicator solution

3 principle

The moisture present in the sample is quantitatively reacted with the Karl Fischer reagent with known water droplet degree. The reaction is as follows. H2O I2 SO2 3C5H5 → N 2C5H5N · HI C5H5N · SO3 C5H5N · SO3 CH3 → OH C5H5NH · OSO2OCH3

4 reagent

The following parts of the reagents and solutions flammable and toxic to humans, the operator should be careful such as splashing on the skin should be immediately washed with water Wash or fit the way to deal with, if not suited to immediate medical treatment. The reagents, solutions and water used in this section shall comply with the requirements of HG/T 2843 when not specified and formulated. 4.1 Karl Fischer reagent; 4.1.1 Karl Fischer reagent containing pyridine; 4.1.2 Karl Fischer reagent without pyridine; 4.2 Methanol (dehydration); 4.3 Sodium tartrate dihydrate.

5 instruments

Karl Fischer direct power titration equipment, the typical device according to GB/T 6283 configuration.

6 Analysis steps

Make two samples in parallel. 6.1 Calibration of Karl Fischer Reagent According to GB/T 6283 specified steps, with water or sodium tartrate diamine calibration reagent on the water titer T. 6.2 Determination.

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