GB/T 2441.9-2010 English PDFUS$139.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 2441.9-2010: Determination of urea -- Part 9: Methylenediurea content -- Spectrophotometric method Status: Valid GB/T 2441.9: Historical versions
Basic dataStandard ID: GB/T 2441.9-2010 (GB/T2441.9-2010)Description (Translated English): Determination of urea -- Part 9: Methylenediurea content -- Spectrophotometric method Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G20 Classification of International Standard: 65.080 Word Count Estimation: 6,629 Date of Issue: 2010-06-30 Date of Implementation: 2011-01-01 Older Standard (superseded by this standard): GB/T 2441.9-2001 Quoted Standard: HG/T 2843 Regulation (derived from): National Standard Approval Announcement 2010 No.2 (Total No.157)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 determination of urea, methylene urea content with two naphthalene sulfonic acid disodium salt method. This section applies only to a small amount of urea in the determination of methylene urea containing content. GB/T 2441.9-2010: Determination of urea -- Part 9: Methylenediurea 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 9. Methylenediurea content Spectrophotometric method ICS 65.080 G20 National Standards of People's Republic of China Replacing GB/T 2441.9-2001 Determination of urea Part 9. methylene diurea content spectrophotometry Part 9. Methylenediureacontent-Spectrophotometricmethod 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 ForewordGB/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 is Part 9 GB/T 2441's. This Part replaces GB/T 2441.9-2001 "Determination of urea Determination of methylene diurea content spectrophotometry." 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 section was first released in 2001. Determination of urea Part 9. methylene diurea content spectrophotometry1 ScopeThis section GB/T 2441 with the provisions of the naphthalene dicarboxylic acid disodium salt (chromotropic acid) Determination of urea content of methylene diurea law. This section applies only to a small amount of urea Determination of methylene diurea containing content.2 Normative referencesThe following documents contain provisions which, through reference to GB/T 2441 to the present, constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use 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 The role of concentrated sulfuric acid, urea methylene diurea decomposition of formaldehyde and urea formaldehyde with naphthalene generate acid disodium salt (chromotropic acid) Reacts purple complex, the absorption wavelength at 570nm, absorbance was measured with a spectrophotometer.4 Reagents and solutionsThe following part-corrosive reagents and solutions, the operator should be careful as splashed on the skin should immediately wash with water or suitable Way to deal with severe cases should be treated immediately. 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 sulfuric acid. 4.2 naphthalene dicarboxylic acid disodium salt (chromotropic acid) solution (10g/L) 1g dissolved naphthalene dicarboxylic acid disodium salt (chromotropic acid) in 100mL of water (solution is stored in a brown bottle, 10 days stability). 4.3 formaldehyde standard solution 4.3.1 Determination of formaldehyde content. Measure 50mL sodium sulfite solution (126g/L), placed in 250mL conical flask, add 3 drops of thymol Phthalate indicator solution (1g/L), with sulfuric acid standard titration solution [c (12H2SO4 ) = 1mol/L] titrated to colorless. Weigh 3mL formaldehyde solution (called Associate to 0.0002g), placed in the above solution, shake, sulfuric acid standard titration solution [c (12H2SO4 ) = 1mol/L] to the solution of titration Blue to colorless. Formaldehyde (HCHO) content w1, the mass fraction (%) expressed by the formula (1). w1 = c × V × 0.03003 × 100m1 (1) Where. C --- accurate titration standard solution of sulfuric acid concentration of value in units of moles per liter (mol/L); Numerical V --- consumption of sulfuric acid standard titration solution volume in milliliters (mL); Numerical mass m1 --- formaldehyde solution, in grams (g); --- Formaldehyde 0.03003 mmol mass in grams per millimole of (g/mmol). ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 2441.9-2010_English be delivered?Answer: Upon your order, we will start to translate GB/T 2441.9-2010_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 2441.9-2010_English with my colleagues?Answer: Yes. 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