Turbidimetric method.
https://www.en-standard.eu/bs-4267-9-1987-ammonium-nitrate-method-for-determination-of-sulphate-content/
Turbidimetric method.
https://www.en-standard.eu/bs-4267-9-1987-ammonium-nitrate-method-for-determination-of-sulphate-content/