ABSTRACT
Colorimetric methods are the most common and are widely employed in environmental wet analysis. Most anions, all metals, and many physical and aggregate properties can be determined by the colorimetric technique, which is fast and cost-e ective. However, the method may be unreliable for dirty and colored samples. O en, the presence of certain substances in samples can interfere with the test. In addition, if the color formation involves a weak color such as yellow, additional con rmatory tests should be performed. Despite these drawbacks, colorimetry is o en the method of choice for a number of wet analyses.
