品级Grade ACS级 (ACS, ≥97.0%) 外观Appearance Black Powder X-射线衍射分析X-Ray Diffraction Conforms to Structure 纯度Purity ≥97.0 % (Titration by Na2S2O3) 不溶物Insoluble matter ≤0.2 % 碳复合物Carbon Compounds ≤0.04 % 氯Chloride ≤0.002 % 锰Manganese (Mn) ≤5 ppm 硝酸根Nitrate (NO3) ≤0.02 % 硫酸根Sulfate (SO4) ≤0.05 % 钠Sodium (Na) ≤0.1 % 钾Potassium (K) ≤0.05 % 钙Calcium (Ca) ≤0.02 % 铜Copper (Cu) ≤0.05 % 99.995% metals basis: 外观Appearance Black Powder X-射线衍射分析X-Ray Diffraction Conforms to standard 纯度Purity ≥99.995% Based on Trace Metals Impurities of ICP ICP Assay Confirms Lead component 痕量金属分析total metallic impurities ≤500ppm by ICP Atomic emission |