BS 3584:1989
Determination of solubility of wool in urea-bisulphite solution
UNE 40205:1972
METHOD TO DETERMINE WOOL SOLUBILITY IN UREA-BISULPHITE.
BS PD CEN/TS 17403:2021
Fertilizers. Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution with a pH of 7,5 at 100 °C