99.99% :
外观Appearance                                 Yellow crystals or powder
红外光谱Infrared spectrum              Conforms to Structure
纯度Purity                                           ≥99.99% Based on Trace Metals Impurities
铬Cr by Titration by Na2S2O3          25.9 - 27.6 %
ICP Major Analysis                              Confirms Cr and K Components
痕量金属Trace Metal Analysis        ≤200.0 ppm by ICP Atomic emission

GB/T3-918-76
项目ltem                                             优等纯　　分析纯　　　化学纯
   (GR)      (AR)        (CP)
含量(K₂CrO₄)Assay,%                    ≥99.5          99.5        99.0
水溶液反应Water solution reaction  合格　　 合格        合格
水不溶物lnsoluble matter in          ≤0.002     0.004       0.01
氯化物(Cl)Chloride,%                   ≤0.001     0.003       0.005
硫酸盐(SO₂)Sulfale,%                   ≤0.01      0.02        0.05
钠(Na)Sodium,%                         ≤0.05      0.1         ——
铝(Al)Aluminum,%                       ≤0.001     0.003       0.01
钙(Ca)Calcium,%                        ≤0.001     0.003       0.01

ACS级
项目名称　                            ACS Grade
含量Assay                              ≥99.0%
pH(50g/L,25℃)
pH of a 5% solution at 25.0℃           8.6-9.8
水不溶物Insoluble matter               ≤0.005%
氯化物(Cl)Chloride                     ≤0.005%
硫酸盐(SO₄)Sulfate                     ≤0.03%
钙(Ca)Calcium                          ≤0.005%
钠(Na)Sodium                           ≤0.02%


基准试剂PT

纯度Assay: 　　99.95-100.05%