Abstract
Gel-phase absorptiometry has been improved for determining silicic acid in highly purified water, in which the absorbance of Molybdenum Blue adsorbed on Sephadex G-25 is measured directly. The gel amount used was reduced to one-sixth of that required in the previously reported method by employing a smaller volume cell and a gel-aliquotting device. Less than 0.05g of the gel could be measured rapidly with good reproducibility and the detection limit of silicon was 0.04μg dm-3.
