草酸 Oxalic acid dihydrate

草酸的化学性质,质量标准及用途

无色单斜片状或棱柱体结晶或白色粉末。密度：1.653 ,熔点：101-102℃ ,沸点：86.9℃
折光率n20/D：1.45560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 、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。
 

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 
 

在酸性镀锡中作络合剂，它与四氯化锡组成络合盐溶解在镀锡溶液中。一般加入量为24～25 g/L。还可用于铜件抛光。铝的草酸阳极氧化和硬质阳极氧化溶液中，以及硫酸盐镀铁和刷镀络等电镀液中。

危险品标志  Xn,C 
危险类别码  21/22 
WGK Germany  1 
RTECS号 RO2450000 
HazardClass  8 
PackingGroup  III 
安全说明  24/25