Acidic molybdate reagent was prepared from 25 mL of 3%(w/v) molybdate
solution (dissolving 1.5 g of ammonium molybdate in 50 mL water) in
62.5 mL of 4 mol L1 sulfuric acid (22 mL of 98%(w/v) sulfuric acid in
100.00 mL water) with 12.5 mL of 0.1%(w/v) antimony tartrate (dissolving
0.1 g of antimony tartrate in 100 mL water)