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Oxalic acid dihydrate
Cas 号： 【6153-56-6】
M D L： MFCD00149102
分子式： C2H2O4·2H2O；HO2CCO2H·2H2O 分子量： 126.07
别 名： 乙二酸,蓚酸 Ethanedioic acid
分子结构式： 
草酸性 状： 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
草酸质量标准： 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
≥99.9999% (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
贮 存： 密封保存a
