Sulphate Test Kit
CHEMetrics offers test kits employing the well-known Turbidimetric method to deliver sensitivity and accuracy within two minutes or less. Based on CHEMetrics patented Self-Filling Reagent Ampoule technology. Premixed. Premeasured. Precise. Each kit contains 30 tests.
The Turbidimetric Method
The Sulphate Vacu-vials® test kit employs the turbidimetric method. Sulphate ion reacts with barium chloride in an acidic solution to form a suspension of barium sulphate crystals of uniform size. The resulting turbidity is proportional to the sulphate concentration of the sample. Results are expressed as ppm (mg/l) SO4.
APHA Standard Methods, 15th ed., Method 426 C (1980).
USEPA Methods for Chemical Analysis of Water and Wastes, Method 375.4 (1983).
ASTM D 516-07, Sulphate Ion in Water.
Sulphate is present at widely varying concentrations in natural waters owing to contact with various mineral deposits and strata. Water hardness is caused almost entirely by the chlorides and sulphates of calcium and magnesium. Neither the EU Drinking Water Directive nor DEFRA water quality regulations specify standards for hardness. The USEPA has established a Secondary Drinking Water Standard of 250 mg/l (ppm) for sulphate in potable water, as higher concentrations affect odour and taste. The Indicator Parametric Value for drinking water for UK at the supply point is the same, as is the Indicator Parametric Value for Ireland. Sulphate levels are also measured in the beverage industry due to its effect on odour and taste. Sulphate levels must be monitored in cooling water and ion exchange water softening systems in order to prevent calcium sulphate scale formation.