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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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 and
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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