IS 2720 -1976 Code Book PDF free download
This Indian Standard (Part XXIV) (First Revision) was adopted by the Indian Standards Institution on 16 February 1976, after the draft finalized by the Soil Engineering Sectional Committee had been approved by the Civil Engineering Division Council. With a view to establishing uniform procedures for the determination of different characteristics of soils and also for facilitating a comparative study of the results, the Indian Standards Institution has brought out the ‘Indian Standard methods of test for soils (IS : 2720)’ which is being published in parts. So far 38 parts have been published. This part (Part XXIV) which was originally published in 1967 covers the method for the determination of cation exchange capacity of soil. Cation exchange capacity gives an indication of the affinity of soil for water and its capacity for swelling. In this revision, a method to determine the exchangeable metallic cations and a method to determine the exchangeable hydrogen ions separately have been given. The sum of the exchangeable ions determined by these methods gives the total exchangeable ions in the soil; however, because of fixation of potassium and ammonium by illiterate and vermiculite type of minerals, the cation exchange capacity values as determined by these ions are generally lower than the true values. A single method which determines the cation exchange capacity (metallic and hydrogen ions together) has also been included. In kepi with the latest trend the term ‘base exchange capacity’ has been replaced by the term ‘cation exchange capacity’. In the formulation of this standard due weight age has been given to international co-ordination among the standards and practices prevailing in different countries in addition to relating it to the practices in the field in this country. In reporting the result of a test or analysis made in accordance with this standard, if the Snail value, observed or calculated, is to be rounded off, it shall be done in accordance with IS: 2-1960
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