The digested samples were poured into a 50 ml beaker. The
beaker was then filled with distilled water up to the 50 ml mark. The
solution in the beaker was transferred into a flask and then three
drops of Ferroin indicator were added turning the solution from
red to orange. The digest solution in the flask was titrated against
FAS solution. The solution turned to light green then colorless and
finally to light red (red wine) at the end point. The burette reading
was then recorded.