BP93 BP98 USP24 Content % 99.0-101.0 99.0-101.0 99.0-101.5 Water % 11.0-13.0 11.0-13.0 11.0-13.0 Heavy metal ppm ≤10 ≤10 ≤10 Oxalate ppm ≤300 ≤300 ≤20 Chloride ppm ≤50 ≤50 ≤5 Sulphate ppm ≤150 ≤150 ≤30