To ascertain the sulphur content in gypsum you must:

– Dry the sample overnight at <40 degC fan forced oven,

– Then crushed and sieved to 0.5mm (including paper if recycled) until all sample passed the sieve. It is then mixed thoroughly.

– Purity of gypsum is calculated by dividing Sulphur % by 0.186 (i.e. pure gypsum is 18.6% Sulphur). Sulphur is determined by the method specified in the report , that is by addition of hydrochloric acid and water then boiled for 30 minutes. Concentration of Sulphur is then determined using ICP against Standard.

– If the gypsum is recycled plasterboard the Total Organic Carbon is determined by Walkely and Black method as requested.

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