10 ml of the sample were measured into a beaker and 8 g of K2SO4 and 1g of CuSO4 were add to the sample, then 15 ml of H2SO4 was slowly added and then the beaker was then placed on heating mantle and was heated until it boiled. The boiled sample was allowed to cool and were diluted with 100 ml of distill water, which was then filtered using filter paper.