UNE 55-595-1981 Determination of total content of sulfuric acid and nitrogen in detergent formulation raw materials by post-distillation volumetric method
The purpose of this standard is to establish a method for determining total nitrogen in sulfuric acid and in oleums used as raw materials for detergent formulations, consisting of volumetric analysis preceded by distillation. This method is applicable to products whose total nitrogen content is equal to or greater than 0.05% by weight.