By the addition of barium salts, sulfate forms hardly soluble Barium sulfate. The generated turbidity is measured photometrically at 585 nm.
Due to the patented reagent mixture (DE 102017200310 B3) a more homogenious precipitate is formed. This allows for more precise results with significantly lower fluctuation rates.
The photometric determination is according to DIN ISO 15923-1:2014-07.