Influence of oxyethylized alkylphenols OP-7 and OP-10 on formation of molybdenum (VI) salicylfluoronate

Spectrophotometric methods have been used for the study of non-ionic surfactants influence on formation of molybdenum (VI) salicylfluoronate. It has been shown that the optimal acidity range for hydrochloric acid is 0.075.0.35 M, if OP-7 is used, and 0.05.0.30 M in the presence of 0P-10. The analytical form for the spectrophotometric determination of molybdenum is the neutral chelate addition compound with the ratio of metal to reagent to OP-7 equaling 1 : 3.5 : 2, which is characterized by a well-resolved absorption band at 520 nm and molar absorptivity 1.14 10 s. The calibration graphs are linear in a wide interval of molybdenum concentration, for several modifications of determination, with the use of OP-7 and 0P-10, or hydrochloric acid and sulfuric acid, while relative standard deviation does not exceed 0.014. The studied methods have been compared to the spectrophotomeric determination of molybdenum with the use of cationic surfactants and gelatin.