15836 尿素 for molecular biology, ≥99% 100g 200
15845 尿素 Ph. Eur., BP, USP, 99.0-100.5% 250g 55
15847 尿素 for molecular biology, ≥99% 500g 283
15856 尿素 药用 500g 65
15859 尿素 for electrophoresis 500g 698
15861 尿素 99.99% metals basis 25g 96
15868 尿素 99.99% metals basis 100g 300
15870 尿素 ACS, ≥99.5% (T) 500g 75
15874 尿素 AR 500g 29
15878 尿素 CP 500g 19
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。 熔点 132-135 °C(lit.) 密度 1.335 g/mL at 25 °C(lit.) 折射率 n20/D 1.40 溶解度 H2O: 8 M at 20 °C
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 品级Grade ACS级 (ACS, ≥99.5% (T)) 外观Appearance White Powder 红外光谱Infrared spectrometry Conforms to Structure 纯度Purity(GC) ≥99.5% (T) 甲醛formaldehyde (HCHO) ≤0.005% 缩二脲biuret ≤0.1% 灼烧残渣Residue on ignition(as SO4) ≤0.01% 熔点Melting point 132-135 °C anion traces by ICP Atomic emission 氯chloride (Cl-): ≤5 ppm 硫酸根sulfate (SO42-): ≤10 ppm cation traces by ICP Atomic emission Ca: ≤10 ppm Cd: ≤5 ppm Co: ≤5 ppm Cr: ≤5 ppm Cu: ≤5 ppm Fe: ≤5 ppm K: ≤50 ppm Mg: ≤5 ppm Mn: ≤5 ppm Na: ≤50 ppm Ni: ≤5 ppm Pb: ≤5 ppm Zn: ≤5 ppm 99.99% metals basis: 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% 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) 品级Grade 电泳级 (for electrophoresis) 铅lead by ICP-atomic emission ≤ 5 ppm 铁iron by ICP-atomic emission ≤ 1 ppm 离子选择性电极测试specific ion electrode test ≤ 0.005% ammonia 电泳测试suitability test suitable for electrophoresis 紫外吸收uv absorbance ≤0.06 AT 260 NM (C= 5 M, H2O) 紫外吸收uv absorbance ≤0.06 AT 280 NM (C= 5 M, H2O) 纯度Purity ≥98% 品级Grade 细胞培养级 (for cell culture) 外观Appearance White Pellets 红外光谱Infrared spectrometry Conforms to Structure 纯度Purity( ≥99.0% 水溶解试验solubility in water Colorless，Clear，100 mg/mL, H2O 水分Water (by Karl Fischer) ≤3% 细胞培养测试Cell Culture Test Pass 品级Grade 分子生物学级，≥99% (for molecular biology, ≥99%, powder) 外观appearance white powder 水溶性solubility clear colorless solution 铅lead by ICP-atomic emission ≤ 5 ppm 铁iron by ICP-atomic emission ≤ 1 ppm 铜copper by ICP-atomic emission ≤ 1 ppm 氯chloride content ≤ 5 ppm 氰酸cyanate content ≤ 10 ppm DNA酶DNases, none detected RND酶RNases, none detected 蛋白酶proteases, none detected 核酸内切酶nickase,endonuclease detection none detected 纯度Purity ≥99% 品级Grade 药典级 (Ph. Eur., BP, USP, 99.0-100.5%) 含量assay 99.0-100.5% (calc. on dry substance) 碱反应物质alkalic reac. substances, complies 残留溶剂residual solvents, complies 重金属heavy metals (as Pb) ≤0.001% 不溶物insoluble in ethanol ≤0.04% 铵根ammonium (NH4) ≤0.05% 缩二脲biuret(carbamylurea) ≤0.1% 灼烧残渣Residue on ignition(as SO4) ≤0.1% 干燥损失loss on drying, 105 °C, 1 h ≤1.0% 熔点Melting point 132-135 °C anion traces 氯chloride (Cl-): ≤10 ppm 硫酸根sulfate (SO42-): ≤50 ppm 铁Fe: ≤0.5 ppm
WGK Germany 1 RTECS号 YR6250000 危险品标志 Xn 危险类别码 36/37/38-40 安全说明 26-36
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。