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Urea

Cas:
57-13-6
Molecular Structure:
MDL:
--MFCD00008022
Molecular Formula:
CH4N2O;H2NCONH2
Molecular Weight:
60.06
Alias:
尿素,碳酰二胺 Carbamide Carbonyldiamide
Product order:
Name Specifications Packing Price Delivery
Urea ≥99.5% 100g RMB 66 现货
Urea ≥99.5% 500g RMB 198 现货
Urea ≥99.5% 1kg RMB 330 现货
Urea ACS 500g RMB 66 Consulting service
Urea AR 500g RMB 38.5 Consulting service
Character:
白色四方棱形状结晶或粉末。有氨的气味和咸味。加热温度高于其熔点时则分解成缩二脲、氨和三聚氰酸。1g溶于1ml水、10ml95%乙醇、1ml95%沸乙醇、20ml无水乙醇、6ml甲醇和2ml甘油。溶于浓盐酸,几乎不溶于乙醚和氯仿。10%水溶液的pH为7.23。有刺激性。
密度:1.32
熔点:132.7℃
Quality Standard:
 
   GB/T 696-94
项目Item                                     分析纯      化学纯
                         (AR)             (CP)
含量(H2NCONH2)Assay,%                       ≥ 99.0            99.0
澄清度试验Clarty                               合格            合格
水不溶物lnsoluble matter in water,%         ≤ 0.005           0.02
灼烧残渣(以硫酸盐计)Ignition residue,%      ≤ 0.01            0.02
氯化物(Cl)Chloride,%                        ≤ 0.0003          0.001
硫酸盐(SO4)Sulfale,%                        ≤ 0.001           0.005
氨(NH3)Ammonia,%                            ≤ 0.005           0.005
铁(Fe)Iron,%                                ≤ 0.0002          0.0005
重金属(以Pb计)Heavy metals,%                ≤ 0.0002          0.005
缩二脲(C2H5N3O2)Blured,%                    ≤ 0.2             0.4


99.99%:

外观Appearance                          无色至白色结晶
X-射线衍射分析X-Ray Diffraction         Conforms to standard
纯度Purity                              ≥99.99% Purity Based On Trace Metals Analysis Of ICP and AA Combined
ICP:                                     Confirms Na and S Components Confirmed
干燥损失Loss on ignition                <0.5% (1 Hours, 1100 °C)
铁Iron (Fe)                             Pass
铵Ammonium (NH4)                        ≤0.005 %
Sulfite and Thiosulfite                 ≤0.1 %
金属杂质Trace Metal Analysis            ≤100.0 ppm by ICP and AA Combined
(Al、Ba、B、Ca、Cr、Fe)
金属杂质Trace Metal Analysis            ≤100.0 ppm by Atomic Absorption
(Li、K、Ru、Cs)

Storage:
密封保存。
用途  分析中用以检验锑和锡。测定铅、钙、铜、镓、磷、碘化物和硝酸盐。测定血液尿素氮时,配标准溶液,测定血清胆红素。烃的分离。分析中用以分解氮的氧化物及亚硝酸。制备培养基。福林法测定尿酸时的稳定剂,均相沉淀。
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