性状 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℃
备注: 以上描述，仅作参考，并不表示您收到的产品，与此项描述完全相符，产品的出厂标准，请参见质量标准。
质量标准
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% 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)
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 at 1g plus 10ml of water
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
贮存 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。
联合国编号
Risk： R38-
Safety : S37-
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