Reagents

Specifications

Appearance A white powder Assay Min 99% Insoluble matter Max 0.01% Loss on drying (at 105°C) Max 0.2% Acidity (as HF) Max 0.05% Free alkali Max 0.04% Chloride (Cl) Max 0.005% Hexafluorosilicate (SiF6) Max 0.1% Sulfate (SO4) Max 0.01% Sulphite (as SO3) Max 0.005% Heavy metal (as Pb) Max 0.001% Calcium (Ca) Max 0.004% Iron (Fe) Max 0.002% Lead (Pb) Max 0.0005%

Specifications

Assay (iodometric) 96.5 - 100 % Assay (as SO2; iodometric) 65 - 67.4 % pH (5% solution in water) 3.5 - 5.0 Insoluble in water Max 0.025 % Chloride (Cl) Max 0.02 % Thiosulphate (S2O3) Max 0.05 % Heavy metal (as Pb) Max 0.002 % Arsenic (As) Max 0.0004 % Iron (Fe) Max 0.002 % Appearance White crystalline powder

Specifications

Assay (as Mg (NO3)2.6H2O) 98.0 - 102.0 % pH (5% solution in water; 25°C) 5.0 - 8.2 Insoluble matter Max 0.005 % Chloride (Cl) Max 0.001 % Phosphate (PO4) Max 0.0005 % Sulfate (SO4) Max 0.005 % Ammonium (NH4) Max 0.003 % Barium (Ba) Max 0.005 % Calcium (Ca) Max 0.01 % Manganese (Mn) Max 0.0005 % Potassium (K) Max 0.005 %

Specifications

Assay 99.0 - 100.5 % Insoluble matter in water Max 0.01 % pH (1% solution in water) 4.1-4.7 pH (5% solution in water; 20°C) 4.2-4.5 pH (5.7% solution in water) 4.1-4.5 Chloride (Cl) Max 0.001 % Sulphate (SO4) Max 0.005 % Arsenic (As) Max 0.0002 % Calcium (Ca) Max 0.002 % Iron (Fe) Max 0.001 % Heavy metal (as Pb) Max 0.0005 %

Specifications

Buffer PH 10 at 20°C Tolerance +/- 0.01

Specifications

BUFFER PH7 at 20°C Tolerance +/- 0.01

Specifications

pH (20º C) 3,98-4,02 Appearance Clear colorless liquid

Specifications

Assay (GC) % Min 90.0 Refractive index at 20°C 1.4100 - 1.4180