Discussion
Which one of the following is used to determine total organic matter by Walkley and Black method ?
Answer: C
The Walkley and Black method oxidises the organic carbon of a soil with potassium dichromate in the presence of concentrated sulphuric acid, and the unused dichromate is titrated. So the reagents are \(\mathrm{K_{2}Cr_{2}O_{7}}\) and \(\mathrm{H_{2}SO_{4}}\). Sodium thiosulphate is used in iodometric titrations, KOH and nitric acid are not the oxidant of this method.
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