Procedure to test sulphate in water using barium chloride.
METHOD: Turbidimetric Method.
PRINCIPLE : Sulfate ion is precipitated in a hydrochloric acid medium with barium chloride to form barium sulfate crystals of uniform size.
Minimum detectable conc. Approximately 1mg so4 /L
REAGENTS :
INTERFERENCE: Silica more than 500 ppm will interfere. Colour and Suspended matter in large amount will interfere.
PROCEDURE : Measure 100 ml sample(Take distilled if necessary) add 5 ml of conditioning reagent. Add spoonful of BaCl2 crystals, Immediately stir for 1 min at constant speed. Take reading on spectrometer at wavelength 420 nm(use charcoal treatment for coloured samples
CALCULATION: mg SO4 x 1000
mg/l SO4 = ---------------------------
ml sample
METHOD: Turbidimetric Method.
PRINCIPLE : Sulfate ion is precipitated in a hydrochloric acid medium with barium chloride to form barium sulfate crystals of uniform size.
Minimum detectable conc. Approximately 1mg so4 /L
REAGENTS :
- Conditioning Reagent : Mix 50 ml glycerol with solution Containing 30ml conc. HCl, 300ml distilled water, 100 ml 95% ethyl or isopropyl alcohol and 75gm NaCl( Sodium Chloride).
- Barium Chloride (BaCl2) : Crystals 20-30 mesh.
INTERFERENCE: Silica more than 500 ppm will interfere. Colour and Suspended matter in large amount will interfere.
PROCEDURE : Measure 100 ml sample(Take distilled if necessary) add 5 ml of conditioning reagent. Add spoonful of BaCl2 crystals, Immediately stir for 1 min at constant speed. Take reading on spectrometer at wavelength 420 nm(use charcoal treatment for coloured samples
CALCULATION: mg SO4 x 1000
mg/l SO4 = ---------------------------
ml sample