草酸

性状描述: 无色单斜片状或棱柱体结晶或白色粉末。在温热、干燥空气中风化，可溶于水及乙醇。无气味。150-160℃升华。在高热干燥空气中能风化。1g溶于7ml水、2ml沸水、2.5ml乙醇、1.8ml沸乙醇、100ml乙醚、5.5ml甘油，不溶于苯、氯仿和石油醚。0.1mol/L溶液的pH值为1.3。低毒，半数致死量（兔，经皮）2000mg/kg。 密度：1.653 熔点：101-102℃ 沸点：86.9℃ 折光率n20/D：1.45560

质量标准: GB/T 9855-88 项目Item 优级纯 分析纯 化学纯 (GR) (AR) (CP) 含量(C2H2O4• 2H2O)Assay,% ≥99.8 99.5 99.5 澄清度试验Clarity 合格 合格 合格 水不溶物Insoluble matter in water,% ≤0.002 0.005 0.01 灼烧残渣（以硫酸盐计）Ignition residue,% ≤0.01 0.02 0.05 氯化钠(Cl)Chloride,% ≤0.0005 0.002 0.005 硫酸盐(SO4)Sulfate,% ≤0.001 0.002 0.005 总氮量(N)Total nitrogen,% ≤0.001 0.002 0.005 钙(Ca)Calcium,% ≤0.001 0.003 0.005 铁(Fe)Iron,% ≤0.0002 0.0005 0.002 重金属(以Pb计)Heavy metals,% ≤0.0002 0.0004 0.001 易碳化物质Readily carboniz-able substance 合格 合格 合格 ACS级 项目名称Item ACS Grade 含量(H2C2O4•2H2O)Assay 99.5-102.5% 易炭化物质Substances darkened by hot sulfuric acid Passes test 水不溶物Insoluble matter ≤0.005% 灼烧残渣Residue after ignition ≤0.01% 氯化物(Cl)Chloride(Cl) ≤0.002% 硫酸盐(SO4)Sulfate ≤0.005% 钙(Ca)Calcium(Ca) ≤0.001% 氮化合物(以N计)Nitrogen compounds(as N) ≤0.001% 重金属(以Pb计)Heavy metals(as Pb) ≤5ppm 铁(Fe)Iron(Fe) ≤2ppm 99.998% metals basis: 外观Appearance White Powder X-射线衍射分析X-Ray Diffraction Conforms to Structure 红外光谱鉴别Infrared spectrometry Conforms to Structure 纯度Purity ≥99.998% Based on Trace Metals Impurities of ICP 痕量金属分析total metallic impurities ≤20ppm by ICP Atomic emission 99.99% metals basis: 外观Appearance White Powder X-射线衍射分析X-Ray Diffraction Conforms to Structure 红外光谱鉴别Infrared spectrometry Conforms to Structure 纯度Purity ≥99.99% Based on Trace Metals Impurities of ICP 痕量金属分析total metallic impurities ≤100ppm by ICP Atomic emission ≥99.9999% (metals basis)： 外观Appearance 白色粉末或结晶 纯度Purity ≥99.9999% Based On Trace Metals Analysis 总氮total nitrogen ≤10 ppm 熔点mp 104-106 °C anion traces by 氯chloride (Cl-): ≤5000 ppb 磷酸根phosphate (PO43-): ≤500 ppb 硫酸根sulfate (SO42-): ≤2000 ppb cation traces Ag: ≤0.01 ppm Al: ≤0.02 ppm As: ≤0.01 ppm Au: ≤0.001 ppm Ba: ≤0.1 ppm Be: ≤0.001 ppm Bi: ≤0.001 ppm Ca: ≤0.1 ppm Cd: ≤0.05 ppm Ce: ≤0.005 ppm Co: ≤0.005 ppm Cr: ≤0.01 ppm Cs: ≤0.01 ppm Cu: ≤0.005 ppm Dy: ≤0.005 ppm Er: ≤0.005 ppm Eu: ≤0.005 ppm Fe: ≤0.5 ppm Ga: ≤0.001 ppm Gd: ≤0.005 ppm Ge: ≤0.005 ppm Hf: ≤0.005 ppm Hg: ≤0.005 ppm Ho: ≤0.005 ppm In: ≤0.001 ppm Ir: ≤0.005 ppm K: ≤0.2 ppm La: ≤0.005 ppm Li: ≤0.005 ppm Lu: ≤0.005 ppm Mg: ≤0.02 ppm Mn: ≤0.005 ppm Mo: ≤0.005 ppm Na: ≤0.1 ppm Nb: ≤0.005 ppm Nd: ≤0.005 ppm Ni: ≤0.01 ppm Os: ≤0.01 ppm Pb: ≤0.01 ppm Pd: ≤0.01 ppm Pr: ≤0.005 ppm Pt: ≤0.05 ppm Rb: ≤0.01 ppm Re: ≤0.005 ppm Rh: ≤0.005 ppm Ru: ≤0.005 ppm Sb: ≤0.001 ppm Sc: ≤0.05 ppm Se: ≤0.01 ppm Sm: ≤0.005 ppm Sn: ≤0.005 ppm Sr: ≤0.1 ppm Ta: ≤0.01 ppm Tb: ≤0.005 ppm Te: ≤0.005 ppm Th: ≤0.005 ppm Ti: ≤0.02 ppm Tl: ≤0.001 ppm Tm: ≤0.005 ppm U: ≤0.001 ppm V: ≤0.01 ppm W: ≤0.005 ppm Y: ≤0.005 ppm Yb: ≤0.005 ppm Zn: ≤0.02 ppm Zr: ≤0.1 ppm

储存条件: 密封保存。

用途: 络合剂。沉淀剂。还原剂。掩蔽络合物的形成剂，校准高锰酸钾及硫酸铈溶液的标准溶液，显微微晶分析检验钠和其他元素。分析中用以检定和测定铍、钙、铬、金、锰、锶、钍等金属离子。沉淀钙、镁、钍和稀土元素。漂白剂。助染剂。