Discussion
Walkley and Black rapid titration method is used for the determination of
Answer: A
The Walkley and Black rapid titration method is used for the determination of the organic carbon content of soil, option A. In this method the organic carbon in the soil is oxidised by potassium dichromate in the presence of concentrated sulphuric acid, and the unused dichromate is titrated against ferrous sulphate.
Nitrate (option B), phosphate (option C) and fluoride (option D) are determined by other methods, such as colorimetry or ion-selective electrodes, and not by this titration. The method is a standard one for soil fertility work in India.
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