Method of two reagents on a solid phase for the determination of simultaneously present vanadium(V) and molybdenum(VI)

The possibility of the use of two reagents for the determination of two ele ments from one sample on one disk of fibrous sorbent was studied. Vanadium( V) and molybdenum(VI) are sorbed on a disk of an anion-exchange fibrous mat erial and, next, sequentially detected by diffuse reflection spectrometry w ith 8-hydroxyquinoline-5-sulfonic acid and phenylfluorone. It was demonstra ted that vanadium and molybdenum can be determined when present simultaneou sly in ratios from 1 : 10 to 10 : 1 in the concentration range 0.01-0.15 mu g/mL (RSD < 15%). The detection limit is 0.005 and 0.003 mu g/mL for vanad ium and molybdenum, respectively.