Phosphorus in water as phosphate is analyzed through the molybdenum blue method. Phosphates react with ammonium heptamolybdate to form phosphomolybdic acid. This is then reduced by ascorbic acid to form molybdenum blue. A standard calibration curve is produced by plotting absorbance vs concentration for the concentration range between 0.00 to 1 ppm of phosphorus. The line has the following equation: 0.9786x 0.0135. A 100 mL water sample was taken for phosphate analysis. A 10 mL aliquot was tak

Ammonium Hydroxide | Formula, Structure & Uses