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Appearance White or light yellow crystal or powder White or light yellow crystal or powder White or light yellow crystal or powder Content(K3C6H5O7) >=% 99.0 99.0-101.0 99.0-101.0 Heavy metal(AsPb) =<% 0.001 0.001 0.001 AS =<% 0.0003 - 0.0001 Loss on drying % 3.0-6.0 - - Moisture% - 4.0-7.0 4.0-7.0 Cl =<% - 0.005 0.005 Sulphate Salt =<% - 0.015 0.015 Qxalate Salt =<% - 0.03 0.03 Sodium =<% - 0.3 0.3 Alkalinity Accord with the test Accord with the test Accord with the test Readily Carbonisable Substances - Accord with the test Accord with the test Transparenly and color of sample - Accord with the test Accord with the test Pyrogens - - Accord with the test