三氧化铬|1333-82-0|铬酸酐,氧化铬,铬酸,无水铬酸,铬酐,铬绿|艾科试剂

暗红色双锥体棱晶、片晶或颗粒状粉末。遇臭氧形成过氧化物。遇过氧化氢形成过氧化铬酸。在250℃分解成三氧化二铬及氧。易溶于水、醇、硫酸及乙醚，能溶于硫酸、碱及热的溴酸钾溶液。系强氧化剂，能氧化醇及其他有机物质，与有机物等易燃物质接触能起火。遇酒精、苯即能发生燃烧或爆炸。对动植物组织有腐蚀性，比重2.7（结晶）、2.8（熔融物）。凝固点170－172℃，熔融时稍有分解，在200－150℃分解放出氧，生成介于CrO 3和Cr2O 3的中间化合物。
熔点：195℃

质量标准

可HG/T 3-934-76
项目Item                                      分析纯     化学纯
                                               (AR)      (CP)
含量CrO₃Assay,%                               ≥99.0     98.0
水不溶物Insoluble matter in water,%           ≤0.003    0.01
氯化物(Cl)Chloride,%                          ≤0.001    0.005
硫酸盐(SO₄)Sulfate,%                          ≤0.01     0.05
钠(Na)Sodium,%                                ≤0.15     0.3
铝(Al)Aluminum,%                              ≤0.003    0.01
钾(K)Potassium,%                              ≤0.05     0.1
铁(Fe)Iron,%                                  ≤0.01     0.02

ACS级
项目名称Item                                 ACS Grade
含量Assay                                     ≥98.0%
不溶物Insoluble matter                        ≤0.01%
氯化物(Cl)Chloride(Cl)                        ≤0.005%
硝酸盐(NO₃)Nitrate                            ≤0.05%
硫酸盐(SO₄)Sulfate                            ≤0.005%
铝(Al)Aluminum(Al)                            ≤0.02%
钡(Ba)Barium(Ba)                              ≤0.01%
铁(Fe)Iron(Fe)                                ≤0.02%
钠(Na)Sodium(Na)                              ≤0.02%

99.9% metals basis:

外观Appearance                          Red to Purple Powder or Flakes
X-射线衍射X-Ray Diffraction             Conforms to Structure
纯度Purity                              ≥99.9% Based on Trace Metals Impurities
铬Cr by Titration by Na2S2O3            51.2- 52.7 %
ICP Major Analysis Confirmed            Confirms Chromium Component
总痕量金属杂质total metallic impurities   ≤1000ppm by ICP Atomic emission

99.99% metals basis:

外观Appearance                          Red to Purple Powder
X-射线衍射X-Ray Diffraction             Conforms to Structure
纯度Purity                              ≥99.99% Based on Trace Metals Impurities
铬Cr by Titration by Na2S2O3            51.2- 52.7 %
ICP Major Analysis Confirmed            Confirms Chromium Component
总痕量金属杂质total metallic impurities   ≤200ppm by ICP Atomic emission