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Name of index	GB14889-94	BP93	BP98
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