Figure 4-5C. Water testing kit, chemical agent AN-M272.
methods of analysis: colorimetric, in which a designated reagent is added to the water
sample which is then placed in a general-purpose colorimeter; and titration, whereby an
indicator reagent is added to the water sample and a measured amount of another
reagent is added untiI the desired reaction occurs (usually a change in color). The
general-purpose colorimeter includes a set of scales printed on cards--one for each test