By D. W. Gilchrist Shirlaw and J. E. Nichols (Auth.)
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T h e apparatus is now left for 2 or 3 min to equilibrate temperature. 9. By opening tap H and squeezing the bulb, the water in the graduated tube and that in tube G are brought to the same level, thus ensuring that the gas in the graduated tube is at atmospheric pressure. 10. T h e volume of gas produced is now noted as also is the temperature of the batrrand the atmospheric pressure. 11. T h e calculation for calcium carbonate from the volume THE ANALYSIS OF SOILS 29 of gas produced is aided by a special slide rule.
20. A COLORIMETRIC TECHNIQUE FOR LIME REQUIREMENT A similar principle has been adopted in a colorimetric technique for lime requirement determination. Tintometer T H E ANALYSIS O F SOILS 37 Limited manufacture a colour standard disc for use in the Lovibond comparator; this is the basis of a field method. Reagents required 1. Buffer solution: This is prepared by dissolving two "Soloid" pH 6-99 buffer tablets in 300 ml distilled water. 2. Nitrazine yellow indicator: Since different batches of nitrazine yellow have different colours at a particular pH value, if the standard Tintometer disc is to be used, the nitrazine yellow should be that supplied by Tintometer.
36). In this case the milliequivalent exchangeable hydrogen is given by the formula: ( 7 - 0 0 - p H of leachate) X220. This method is only suited to acid soils where a relatively large change in reaction can be observed. 36. THE QUANTITATIVE DETERMINATION OF METALLIC CATIONS THAT ARE NOT PRESENT AS SOLUBLE SALTS Reagents required Normal ammonium acetate (pH 7-0) is used as a leachate. This can be prepared from analytical reagent grade ammonium acetate by dissolving 77-1 g in a litre of distilled water.
A Practical Course in Agricultural Chemistry by D. W. Gilchrist Shirlaw and J. E. Nichols (Auth.)