1 Scope
This standard specifies technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage of urea.
This standard is applicable to the urea composed of ammonia and carbon dioxide. The urea is classified into two categories - industrial use and agricultural use. Its main purposes are as fertilizer for agricultural use, and as plastics, resin, coating, pharmaceutical and other industrial raw materials.
Molecular formula: CO(NH2)2
Relative molecular mass: 60.055 (according to the International Relative Atomic Mass Table in 1997)
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated are valid. All standards are subject to revision, and parties using the standard shall investigate the possibility of applying the latest edition of the standards indicated below.
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)
1 Scope
This standard specifies technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage of urea.
This standard is applicable to the urea composed of ammonia and carbon dioxide. The urea is classified into two categories - industrial use and agricultural use. Its main purposes are as fertilizer for agricultural use, and as plastics, resin, coating, pharmaceutical and other industrial raw materials.
Molecular formula: CO(NH2)2
Relative molecular mass: 60.055 (according to the International Relative Atomic Mass Table in 1997)
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated are valid. All standards are subject to revision, and parties using the standard shall investigate the possibility of applying the latest edition of the standards indicated below.
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)
