What is the color-developing solution used for testing catalyst drum water samples?
Thread Content
What is the color-developing solution used for testing boiler water samples in catalytic processes? It is presumably used to determine pH, alkalinity, and phosphate levels; before pouring the sample into the instrument, this yellow color-developing solution is added. If the phosphate level is high, a yellow color appears; if the phosphate level is low, no color is observed. What is the name of this color-developing solution? Seeking help,
It should be an ammonium molybdate solution, which needs to be acidified with sulfuric acid. Yellow is the color of the phosphomolybdic heteropoly anion; it turns blue when a reducing agent is added. The specific preparation requires following the instructions in some analytical chemistry manuals or textbooks.