级别/Grade

感光一级/The First Photo Grade

感光二级/The Second Photo Grade

优级品/Super Grade

含量/Main content

≥99.5%

≥99.5%

≥99.0%

干燥失重/Loss on drying

≤0.3%

≤0.3%

≤0.5%

氯化物/Chloride

≤0.2%

≤0.2%

≤0.5%

溴酸盐/Bromate

≤0.001%

≤0.003%

≤0.005%

碘化物/Iodide

≤0.001%

≤0.005%

≤0.005%

硫酸盐/Sulphate

≤0.005%

≤0.005%

≤0.01%

PH值/PH Value(5％)

6.0—7.5

5.5—7.5

5.5—7.5

砷/As

—

—

≤0.0004％

铅/Pb

≤0.2ppm

≤4ppm

≤10ppm

铁/Fe

≤0.5ppm

≤4ppm

≤5ppm

铜/Cu

≤0.5ppm

≤1.0ppm

≤1ppm

铋/Bi

≤0.2ppm

≤0.5ppm

—

透光度/Peroxide solution penetrability(250g/l)

93～100

(410nm)

85～100(410nm)

—

澄清度/Transparency  test

Qualified

Qualified

—

氨/Ammonia

≤15.0ppm

—

—

色度/Peroxide solution chromaticity(250g/l)

≤(15.0 Black once)

—

—