GB/T 2441.7-2010Determination of urea - Part 7: Particle size - Sieve method (English PDF)
尿素的测定方法 第7部分：粒度 筛分法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 30, 2010
Implementation date
January 1, 2011
Scope
GB/T 2441.7-2010 is the English-translated version of 尿素的测定方法 第7部分：粒度 筛分法.
GB/T 2441.7-2010 is Part 7 of GB/T 2441 and covers the determination of the particle size of urea by the sieve method.
Its table of contents lists Scope, Normative references, Principle, Instruments, Analysis steps and Results presentation, but the page prints only the last two clauses, so what clause 1 says about the field of application is not shown.
Clause 5 has the operator select a set of test sieves matching the particle size d of the material tested, for which it gives the ranges 0.85 mm to 2.8 mm, 1.18 mm to 3.35 mm, 2.00 mm to 4.75 mm and 4.00 mm to 8.00 mm; the sieves are then piled up by hole diameter with the large-size at the top and the small-size at the bottom, mounted on the chassis, loaded with about 100 g of laboratory sample weighed to 0.5 g, covered, clamped on the oscillator and oscillated for 3 min, or sieve-screened by hand.
The sample that has gone through the large-hole sieve and not through the small-hole one is then weighed, particles stuck in the sieve holes counting as not having gone through.
Clause 6 expresses the particle size as a mass fraction in percent, calculated by formula 1 from that mass and the mass of the sample, and has the result given to one decimal place.
The foreword states that GB/T 2441 is divided into seven parts, that this part was proposed by the China Petroleum and Chemical Industry Association and is centralized by the national standardization technical committee of fertilizer and soil conditioner (SAC/TC 105), and that the main change from the previous edition is the addition of manual screening in the analysis steps; it also lists GB/T 2448-1981 and GB/T 2448-1991 among the earlier versions this part supersedes.
It replaces GB/T 2441.7-2001, was issued on 2010-06-30 and has applied since 2011-01-01.
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Document preview — GB/T 2441.7-2010
National Standard of the People's Republic of China
- ICS
- 65.080
- Classification
- G 20
- Replacing
- GB/T 2441.7-2001
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative References4
- 3 Principle4
- 4 Instruments4
- 5 Analysis steps5
- 6 Results presentation5
Foreword
GB/T 2441 "Determination of Urea" is divided into 7 parts as follows.
Part 1: Determination of urea - Part 1: Total nitrogen content
Part 2: Determination of urea - Part 2: Biuret content - Spectrophotometric method
Part 3: Determination of urea - Part 3: Water content - Karl Fischer method
Part 4: Determination of urea - Part 4: Iron content - 1,10-Phenanthroline spectrophotometric method
Part 5: Determination of urea - Part 5: Alkalinity - Titrimetric method
Part 6: Determination of urea - Part 6: Water insoluble matter content - Weight method
Part 7: Determination of urea - Part 7: Particle size - Sieve method
This part is part 7 of GB/T 2441.
This part replaces GB/T 2441.7-2001 "Determination of urea - Determination of particle size - Sieve method".
Compared with GB/T 2441.7-2001, the main changes of this part is. In analysis steps, add manual screening.
This part was proposed by the China Petroleum and Chemical Industry Association.
This part shall be centralized by the National Standardization Technical Committee of Fertilizer and Soil Conditioner (SAC/TC 105).
The previous versions replaced by this part are as follows.
- GB/T 2448-1981, GB/T 2448-1991, and GB/T 2441.7-2001.
5 Analysis steps
5.1 According to the tested materials, and according to the particle size d (0.85 mm - 2.8 mm, 1.18 mm - 3.35 mm, 2.00 mm - 4.75 mm, 4.00 mm - 8.00 mm) to select a set of (2) corresponding test sieves.
5.2 According to the size of hole-diameter, pile up the sieves in the sequence from large-size to small-size (large-size at upper, small-size at lower). Mount on the chassis.
Weigh about 100 g of laboratory sample (accurate to 0.5 g). Place the sample onto the sieves that have been piled up. Cover the sieves. Place on the oscillator. Clamp well.
Oscillate for 3 min; or manually sieve-screen it. Weigh the samples that have gone through the large-hole sieve and have not gone through the small-hole sieve. The particles stuck in sieve-hole are counted as not-go-through.
6 Results presentation
Particle size w, expressed in mass fraction (%), shall be calculated according to formula (1).
Where.
m1 - The mass value of samples that have gone through the large-hole sieve and have not gone through the small-hole sieve, in units of grams (g);
m - The mass value of the sample, in units of grams (g).
The calculation result is expressed to 1 decimal place. […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB/T 2441.7
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 2441.7-2010 | Determination of urea - Part 7: Particle size - Sieve method | current edition | Current |
| GB/T 2441.7-2001 | Determination of urea - Part 7: Particle size - Sieve method | previous edition | Superseded |
This page sells the current edition, GB/T 2441.7-2010. Earlier editions are listed for reference only.
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Related Standards
GB/T 2441.1-2008 — Determination of urea - Part 1: Total nitrogen content
GB/T 2441.2-2010 — Determination of urea - Part 2: Biuret content - Spectrophotometric method
GB/T 2441.3-2010 — Determination of urea - Part 3: Water content - Karl Fischer method
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GB/T 2441.7-2010
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