GB/T 2441.6-2001 Determination of urea - Determination of water-insoluble matter - Gravimetric method

This standard was first issued in 1981. From the date of implementation, this standard replaces GB/T 2447-1991. This standard is a revision of GB/T 2447-1991 "Determination of water-insoluble matter content of industrial urea by gravimetric method". This standard is part 6 of GB/T 2441 "Determination method of urea". This standard specifies the determination of water-insoluble matter content in urea by gravimetric method. This standard is applicable to the determination of water-insoluble matter content in industrial urea synthesized from ammonia and carbon dioxide. GB/T 2441.6-2001 Determination method of urea Determination of water-insoluble matter content by gravimetric method GB/T2441.6-2001 Standard download decompression password: www.bzxz.net

GB/T 2441.6—2001
This standard is the sixth part of GB/T2441 "Determination of water-insoluble matter content of industrial urea" in GB/T2447-1991. GB/T2441 also includes the following parts:
Part 1 GB/T2441.1—2001
Part 2 GB/T2441.2—2001
Part 3 GB/T2441.3—2001
Part 4 GB/T2441.4--2001
Part 5 GB/T2441.5—2001
Part 7 GB/T2441.7--2001
|Part 8 GB/T2441.8-2001
Part 9 GB/T2441.9-2001
Urea determination method
Urea determination method
Urea determination method
Urea determination method
Urea determination method
Urea determination method
Urea determination method
This standard shall replace GB/T2447-1991 from the date of implementation. This standard is proposed by the State Bureau of Petroleum and Chemical Industry. Revision of the "Weight Method".
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Determination of methylene diurea content Spectrophotometric method This standard is under the jurisdiction of the National Technical Committee for Standardization of Fertilizers and Soil Conditioners and is responsible for interpretation. The drafting units of this standard are: National Fertilizer Quality Supervision and Inspection Center (Shanghai), PetroChina Urumqi Petrochemical Company Fertilizer Plant, Sinopec Jiujiang Branch, Hainan Fudao Chemical Co., Ltd. The main drafters of this standard are: Zhang Qiuzhen and Yang Jiqun. This standard was first issued in 1981.
1 Scope
National Standard of the People's Republic of China
Determination of urea
Determination of water insolution matter content-Weight method
This standard specifies the determination of water insoluble matter content in urea by weight method. GB/T 2441. 6-2001
Replaces GB/T2447..1991
This standard applies to the determination of water insoluble matter content in industrial urea synthesized from ammonia and carbon dioxide. 2 Method Summary
Use a glass crucible filter to filter the urea aqueous solution under reduced pressure, and the residue is expressed as the amount of water insoluble matter. 3 Instruments
General laboratory instruments andbzxz.net
3.1 Glass crucible filter, No. 4 (pore size 4μm～16um). Volume 30mL; 3.2 Constant temperature drying oven;
3.3 Water bath.
4 Analysis steps
Weigh about 50g of laboratory sample (accurate to 0.05g), and dissolve the sample in 150～200mL of water. Keep the solution in a 90℃ water bath for 30min, and immediately filter it under reduced pressure while hot using a No. 4 glass filter that has been weighed to a constant weight, wash the filter residue with hot water for 3~5 times, using about 15mL each time, remove the filter, and dry it in a constant temperature drying oven at 105℃～110C to a constant weight. 5 Description of analytical results
The water-insoluble content (X) in the sample is expressed as mass fraction (%) and is calculated as follows: X = m × 100
Wherein: m is the mass of the residue after drying·g;
m---the mass of the sample, g.
Take the arithmetic mean of the parallel determination results as the determination result, and express the result to four decimal places. 6 Allowable difference
The absolute difference of the parallel determination results shall not exceed 0.0050%. Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on July 26, 2001 92
Implementation on 2002-D1-01
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