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Status : Active
Standard Type : Main
Document No : ISO 7408:1983
Document Year : 1983
Pages : 5
Edition : 1
Section Volume : Fertilizers and soil conditioners (ISO/TC 134.)
The method consists in entraining, by means of a strong current of air, of the ammonia from a moderately alkaline test mixture at ambient temperature into standard volumetric sulfuric acid solution, and back-titrating of the excess sulfuric acid solution with standard volumetric sodium hydroxide solution.