项目ITEM

标准LIMIT

含量 ASSAY

98.5%~101.0%

透光率(Transmittance)

≥98.0%

pH值

5.5 ~ 7.0

氯化物CHLORIDE

≤ 0.002%

干燥失重 LOSS ON DRYING

≤0.20%

灼烧残渣  RESIDUE ON IGNITION

≤ 0.10%

硫酸盐SULFATE(SO42-)

≤0.02%

铁盐IRON (Fe)

≤ 20 PPM

重金属HEAVY METALS (Pb)

≤10 PPM

铵盐(Ammonium salt)[NH4+]

≤0.02%

砷盐ARSENIC (As2O3)

≤ 1 PPM