Codes & Standards - Purchase
ISO 6387:1983
Surface active agents -- Determination of the power to disperse calcium soap -- Acidimetric method (Modified Schoenfeldt method)
SKU: iso_012721_105151
Published by ISO
Publication Year 1983
1 Edition
3 pages
Product Details
A 0,5 % (m/m) aqueous soap solution is prepared, and after maintaining this at testing temperature for 24 h, an aliquot portion of this solution is taken. This aliquot portion is mixed with a dilute solution of the dispersing agent (surface active agent) and subsequently with a specified volume of water of known calcium hardness. The mixture is maintained for 1 h at the testing temperature and then the calcium soap present in a aliquot portion of the lower layer is titrated with a standard volumetric solution of hydrochloric acid in the presence of bromcresol green as indicator.