GB 2440-2001 English PDF

GB 2440-2001: [GB/T 2440-2001] Urea
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GB 2440-2001
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 65.080
G 21
Replacing GB 2440-1991, GB/T 13257-1991
Urea
尿素
ISSUED ON. JULY 26, 2001
IMPLEMENTED ON. JANUARY 1, 2002
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Requirements ... 5 
4 Test methods ... 6 
5 Inspection rules ... 6 
6 Marks ... 8 
7 Packaging, transport and storage ... 8 
Annex A (Informative) Urea for industrial use - Determination of ash - Weigh
method ... 10 
Foreword
Clause 3, Clause 6 and 7.1 of Clause 7 of this Standard are mandatory; the rest
are recommendatory.
This Standard is the modification to GB 2440-1991 Urea and GB/T 13257-1991
Urea for industrial use - Determination of ash - Weigh method.
Compared with GB 2440-1991, the main technical differences of this Standard
are as follows.
1 in technical requirements, ADJUSTED the indicator of total nitrogen content,
the indicator of moisture and the indicator of granularity, ADDED the
indicator of granularity of large granular urea and DIVIDED the particle size
range of particle size into four grades;
2 made GB/T 13257-1991 Urea for industrial use - Determination of ash -
Weigh method as Annex A of this Standard for type inspection;
3 modified the sampling method in inspection rules.
Annex A of this Standard is informative.
This Standard was proposed by China State Bureau of Petroleum and
Chemical Industry.
This Standard shall be under the jurisdiction of and interpreted by National
Technical Committee on Fertilizers and Soil Conditioning Agents of
Standardization Administration of China.
The drafting organizations of this Standard. National Fertilizer Quality
Supervision and Inspection Center (Shanghai), PetroChina Urumqi
Petrochemical Company Fertilizer Plant, China Petroleum and Chemical
Corporation Jiujiang Branch, Hainan Fu Island Chemical Co., Ltd.
Main drafters of this Standard. Zhang Qiuzhen, Jiang Jianxin, Li Yujia, Guo
Zuliang, Sha Yanping, Yang Jiqun.
This Standard was issued for the first time in 1981.
Urea
1 Scope
This Standard specifies the technical requirements, test methods, inspection
rules and marks, packaging, transportation and storage of urea.
This Standard applies to the urea made by carbon dioxide, which is divided into
industrial use and agricultural use. Its main use is in agriculture as a fertilizer
while in industries of plastic, resin, coating, medicine as industrial raw material.
Molecular formula. CO(NH2)2
Relative molecular mass. 60.055 (according to the International Relative Atomic
Mass Index, 1997)
2 Normative references
The following standards contain the provisions which, through reference in this
Standard, constitute the provisions of this Standard. At the time of publication
of this Standard, the versions shown are valid. All standards shall be revised.
However, the parties who enter into agreement based on this Standard are
encouraged to investigate whether the latest versions of these documents are
applicable.
GB/T 1250-1989, Rules for expression and judgement of limiting values;
GB/T 2441.1-2001, Determination of urea - Determination of total nitrogen
content;
GB/T 2441.2-2001, Determination of urea - Determination of biuret content-
Spectrophotometric method (neq ISO 2574.1973);
GB/T 2441.3-2001, Determination of urea - Determination of water content -
Karl Fischer method (eqv ISO 2573.1973);
GB/T 2441.4-2001, Determination of urea - Determination of iron content -
1,10 - Phenanthroline spectrophotometric method (neq ISO 6685.1982);
GB/T 2441.5-2001, Determination of urea - Determination of alkalinity -
Titrimetric method (neq ISO 1593.1977);
GB/T 2441.6-2001, Determination of urea - Determination of water insolution
4 Test methods
4.1 Determination of total nitrogen content
In accordance with the provisions of GB/T 2441.1.
4.2 Determination of biuret content
In accordance with the provisions of GB/T 2441.2.
4.3 Determination of moisture content
In accordance with the provisions of GB/T 2441.3.
4.4 Determination of iron content
In accordance with the provisions of GB/T 2441.4.
4.5 Determination of alkalinity
In accordance with the provisions of GB/T 2441.5.
4.6 Determination of water-insoluble matter content
In accordance with the provisions of GB/T 2441.6.
4.7 Determination of granularity
In accordance with the provisions of GB/T 2441.7.
4.8 Determination of sulfate content
In accordance with the provisions of GB/T 2441.8.
4.9 Determination of methylene diurea content
In accordance with the provisions of GB/T 2441.9.
5 Inspection rules
5.1 In this Standard, “Comparison of Revised Value” of GB/T 1250-1989 is
adopted to determine the qualification of indicators.
5.2 The product shall be inspected by the quality inspection department of the
manufacturer. The manufacturer should ensure that each batch of exit-factory
products meet the requirements of this Standard. Each batch of exit-factory
products should be accompanied by a certain format of the quality certificate.
The certificate includes the following contents. name of the manufacturer,
different requirements for industrial products and agricultural products, to divide
into specimens of 600 g ~ 1200 g. Pack them into two clean, dry wide-mouth
bottles with grinding mouth plugs or polyethylene bottles and seal. Stick labels
which indicate the manufacturer’s name, product name, type, batch number,
particle size range, sampling date and sampler name. One bottle is for product
quality analysis. The other bottle shall be stored for two month for reference.
5.7 If there is an indicator in the inspection results do not meet the
requirements of this Standard, it shall re-extract samples of double amount from
sampling bags for inspection. In the results of re-inspection, if one indictor fail
to meet the requirements of this Standard, the whole batch of products shall not
be accepted.
5.8 In case of argument on product quality between the supplier and the buyer,
it shall carry out in accordance with relevant provisions of Product Quality
Arbitration Inspection and Product Quality Identification Management Methods.
6 Marks
Packaging bags should be marked with the particle size range. The category
cannot be marked. The rest shall be marked according to the provisions of GB
18382.
7 Packaging, transport and storage
7.1 The urea shall be packed by double-layer bag of which the outer bag is
plastic woven bag and the inner bag is a polyethylene film bag OR composite
plastic woven bag.
The net content of each bag is (25 ± 0.25) kg, (40 ± 0.4) kg or (50 ± 0.5) kg.
The average net content of each batch of product bags shall not be less than
25.0 kg, 40.0 kg, 50.0 kg.
The quality of the urea package shall comply with the relevant provisions of GB
8569.
7.2 The urea can be transported by cars, trains, ships or other means of
transportation. Transport and handling tools should be clean, smooth, without
prominent sharp objects, so as not to pierce, scratch the package.
7.3 The urea should be stored in flat, cool, ventilated and dry warehouse. The
packages should be stacked neatly. The stacking height should be less than 7
m.
7.4 Pay attention to rain-proof, sun-proof during the transport and storage of
GB 2440-2001
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 65.080
G 21
Replacing GB 2440-1991, GB/T 13257-1991
Urea
尿素
ISSUED ON. JULY 26, 2001
IMPLEMENTED ON. JANUARY 1, 2002
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Requirements ... 5 
4 Test methods ... 6 
5 Inspection rules ... 6 
6 Marks ... 8 
7 Packaging, transport and storage ... 8 
Annex A (Informative) Urea for industrial use - Determination of ash - Weigh
method ... 10 
Foreword
Clause 3, Clause 6 and 7.1 of Clause 7 of this Standard are mandatory; the rest
are recommendatory.
This Standard is the modification to GB 2440-1991 Urea and GB/T 13257-1991
Urea for industrial use - Determination of ash - Weigh method.
Compared with GB 2440-1991, the main technical differences of this Standard
are as follows.
1 in technical requirements, ADJUSTED the indicator of total nitrogen content,
the indicator of moisture and the indicator of granularity, ADDED the
indicator of granularity of large granular urea and DIVIDED the particle size
range of particle size into four grades;
2 made GB/T 13257-1991 Urea for industrial use - Determination of ash -
Weigh method as Annex A of this Standard for type inspection;
3 modified the sampling method in inspection rules.
Annex A of this Standard is informative.
This Standard was proposed by China State Bureau of Petroleum and
Chemical Industry.
This Standard shall be under the jurisdiction of and interpreted by National
Technical Committee on Fertilizers and Soil Conditioning Agents of
Standardization Administration of China.
The drafting organizations of this Standard. National Fertilizer Quality
Supervision and Inspection Center (Shanghai), PetroChina Urumqi
Petrochemical Company Fertilizer Plant, China Petroleum and Chemical
Corporation Jiujiang Branch, Hainan Fu Island Chemical Co., Ltd.
Main drafters of this Standard. Zhang Qiuzhen, Jiang Jianxin, Li Yujia, Guo
Zuliang, Sha Yanping, Yang Jiqun.
This Standard was issued for the first time in 1981.
Urea
1 Scope
This Standard specifies the technical requirements, test methods, inspection
rules and marks, packaging, transportation and storage of urea.
This Standard applies to the urea made by carbon dioxide, which is divided into
industrial use and agricultural use. Its main use is in agriculture as a fertilizer
while in industries of plastic, resin, coating, medicine as industrial raw material.
Molecular formula. CO(NH2)2
Relative molecular mass. 60.055 (according to the International Relative Atomic
Mass Index, 1997)
2 Normative references
The following standards contain the provisions which, through reference in this
Standard, constitute the provisions of this Standard. At the time of publication
of this Standard, the versions shown are valid. All standards shall be revised.
However, the parties who enter into agreement based on this Standard are
encouraged to investigate whether the latest versions of these documents are
applicable.
GB/T 1250-1989, Rules for expression and judgement of limiting values;
GB/T 2441.1-2001, Determination of urea - Determination of total nitrogen
content;
GB/T 2441.2-2001, Determination of urea - Determination of biuret content-
Spectrophotometric method (neq ISO 2574.1973);
GB/T 2441.3-2001, Determination of urea - Determination of water content -
Karl Fischer method (eqv ISO 2573.1973);
GB/T 2441.4-2001, Determination of urea - Determination of iron content -
1,10 - Phenanthroline spectrophotometric method (neq ISO 6685.1982);
GB/T 2441.5-2001, Determination of urea - Determination of alkalinity -
Titrimetric method (neq ISO 1593.1977);
GB/T 2441.6-2001, Determination of urea - Determination of water insolution
4 Test methods
4.1 Determination of total nitrogen content
In accordance with the provisions of GB/T 2441.1.
4.2 Determination of biuret content
In accordance with the provisions of GB/T 2441.2.
4.3 Determination of moisture content
In accordance with the provisions of GB/T 2441.3.
4.4 Determination of iron content
In accordance with the provisions of GB/T 2441.4.
4.5 Determination of alkalinity
In accordance with the provisions of GB/T 2441.5.
4.6 Determination of water-insoluble matter content
In accordance with the provisions of GB/T 2441.6.
4.7 Determination of granularity
In accordance with the provisions of GB/T 2441.7.
4.8 Determination of sulfate content
In accordance with the provisions of GB/T 2441.8.
4.9 Determination of methylene diurea content
In accordance with the provisions of GB/T 2441.9.
5 Inspection rules
5.1 In this Standard, “Comparison of Revised Value” of GB/T 1250-1989 is
adopted to determine the qualification of indicators.
5.2 The product shall be inspected by the quality inspection department of the
manufacturer. The manufacturer should ensure that each batch of exit-factory
products meet the requirements of this Standard. Each batch of exit-factory
products should be accompanied by a certain format of the quality certificate.
The certificate includes the following contents. name of the manufacturer,
different requirements for industrial products and agricultural products, to divide
into specimens of 600 g ~ 1200 g. Pack them into two clean, dry wide-mouth
bottles with grinding mouth plugs or polyethylene bottles and seal. Stick labels
which indicate the manufacturer’s name, product name, type, batch number,
particle size range, sampling date and sampler name. One bottle is for product
quality analysis. The other bottle shall be stored for two month for reference.
5.7 If there is an indicator in the inspection results do not meet the
requirements of this Standard, it shall re-extract samples of double amount from
sampling bags for inspection. In the results of re-inspection, if one indictor fail
to meet the requirements of this Standard, the whole batch of products shall not
be accepted.
5.8 In case of argument on product quality between the supplier and the buyer,
it shall carry out in accordance with relevant provisions of Product Quality
Arbitration Inspection and Product Quality Identification Management Methods.
6 Marks
Packaging bags should be marked with the particle size range. The category
cannot be marked. The rest shall be marked according to the provisions of GB
18382.
7 Packaging, transport and storage
7.1 ...