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Status : Active
Standard Type : Main
Document No : ISO 7109:1985
Document Year : 1985
Pages : 1
Edition : 1
Section Volume : Chemistry (ISO/TC 47.)
A test portion is evaporated in a tared platinum dish and the residue is weighed after drying at 105 2 °C. The method is applicable to solutions containing not more than 35 % (m/m) ammonia.