GB/T 2441.2-2010 English PDF

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GB/T 2441.2-2010: Determination of urea -- Part 2: Biuret content -- Spectrophotometric method
Status: Valid

GB/T 2441.2: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 2441.2-2010	139	Add to Cart	3 days	Determination of urea -- Part 2: Biuret content -- Spectrophotometric method	Valid
GB/T 2441.2-2001	199	Add to Cart	2 days	Determination of urea Determination of biuret content Spectrophotometric method	Obsolete

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Basic data

Standard ID: GB/T 2441.2-2010 (GB/T2441.2-2010)
Description (Translated English): Determination of urea -- Part 2: Biuret content -- Spectrophotometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G20
Classification of International Standard: 65.080
Word Count Estimation: 6,659
Date of Issue: 2010-06-30
Date of Implementation: 2011-01-01
Older Standard (superseded by this standard): GB/T 2441.2-2001
Quoted Standard: 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 use of copper complex t spectrophotometric determination of biuret in urea content. This section applies to synthesis from ammonia and carbon dioxide obtained biuret urea Determination.

GB/T 2441.2-2010: Determination of urea -- Part 2: Biuret content -- Spectrophotometric 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 2. Biuret content Spectrophotometric method ICS 65.080 G20 National Standards of People's Republic of China Replacing GB/T 2441.2-2001 Determination of urea Part 2. biuret content spectrophotometry Issued on. 2010-06-30 2011-01-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 2441 "Determination of urea" is divided into nine sections. --- Part 1. total nitrogen content; --- Part 2. biuret content spectrophotometry; --- Part 3. Moisture Karl Fischer method; --- Part 4. iron content - Phenanthroline spectrophotometric method; --- Part 5. alkalinity volumetric method; --- Part 6. Water-insoluble content - Gravimetric method; --- Part 7. particle size sieving; --- Part 8. sulphate content Visible turbidimetric method; --- Part 9. methylene diurea content spectrophotometry. This section GB/T 2441 Part 2. This Part replaces GB/T 2441.2-2001 "Determination of urea Determination reduction diurea content spectrophotometry." This section compared with the GB/T 2441.2-2001 main changes are as follows. --- Remove the ISO foreword. This part is proposed by the China Petroleum and Chemical Industry Association. This part of the National Standardization Technical Committee and soil conditioners Fertilizers (SAC/TC105) centralized. This section drafted by. National Fertilizer Quality Supervision and Inspection Center (Shanghai). The main drafters of this section. Zhang truth, Sun Dan. This part of the standard replaces the previous editions are. --- GB/T 2443-1981, GB/T 2443-1991, GB/T 2441.2-2001. Determination of urea Part 2. biuret content spectrophotometry

1 Scope

This section GB/T 2441 specifies the spectrophotometric determination of biuret in urea content of copper complex salt. This section applies to the synthesis from ammonia and carbon dioxide obtained biuret urea Determination.

2 Normative references

The following documents contain provisions which, through reference to GB/T 2441 to the present, constitute provisions of this section. For dated references, All subsequent amendments (excluding corrections) or revisions do not apply to this section, however, encourage an agreement under this section Parties to study the latest versions of these documents. For undated reference documents, the latest versions apply to this section. HG/T 2843 fertilizer products for chemical analysis commonly used standard titration solution, standard solution, reagent solution and indicator solution. Principle 3 Biuret generated purple complex in alkaline solution of copper sulfate, potassium sodium tartrate in, 550nm absorbance was measured at a wavelength of.

4 Reagents and solutions

As used in this section reagent solution and water, in the specifications and method of preparation is not specified, it shall comply with the provisions of HG/T 2843's. 4.1 copper sulfate solution, 15g/L; 4.2 alkaline potassium sodium tartrate solution, 50g/L; 4.3 biuret standard solution, 2.00g/L.

5 Instruments

5.1 usually laboratory instruments; 5.2 a water bath at 30 ℃ ± 5 ℃; 5.3 Spectrophotometer with 3cm absorption cell. Step 6 Analysis Do two parallel determination of sample. Draw standard curve 6.1 6.1.1 Preparation of standard colorimetric solution. 6.1.2 as shown in Table 1, the biuret standard solution were injected sequentially eight 100mL flask. Table 1 biuret standard solution amount Biuret standard solution volume/mL biuret corresponding amount/mg 00 2.50 5.00 5.00 10.0 10.0 20.0 ......

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