Simple modification of karl-fischer titration method for determination of water content in colored samples

The most commonly used technique for water content determination is karl-fischer titration with electrometric detection,requiring specialized equipment. when appropriate equipment is not available,the method can be performed through visual detection of a titration endpoint,which does not enable an analysis of colored samples. here,we developed a method with spectrophotometric detection of a titration endpoint,appropriate for moisture determination of colored samples. the reaction takes place in a sealed 4ml cuvette. detection is performed at 520nm. titration endpoint is determined from the graph of absorbance plotted against titration volume. the method has appropriate reproducibility (rsd = 4.3 ),accuracy,and linearity (r 2 = 0.997). © 2012 eva tavar et al.