Selective Extraction and Spectrophotometric Determination Of Mo(V) With N1-Hydroxy-N1-P-Tolyl-N2-B-Naphthyl Benzamidine Hydrochloride and Thiocyanate

Alok Mishra¹ and Hemlata Mohabey²*

¹Department of Chemistry, Government Digvijay P.G. College, Rajnandgaon (C.G.) ²Principal, Government K.D.M. College, Rajnandgaon (C.G.)

The introduction of Hydroxyamidines as new type of chelating agents, opens a new field of analytical interests. These compounds have wider scope as analytical reagents. The Hydroxyamidines have functional group. The functional grouping has three site for substitution. The properties of the reagent can be modified by suitable substitution. N1-Hydroxy-N1-P-Tolyl-N2-b-naphthyl benzamidine hydrochloride is a newly synthesised reagent, Mo(vi) is reduced to Mo(v) with ascorbic acid in Hydrochloric acid solution and then complexed with thiocyanate. The orange-red complex is extracted with benzene solution N1-Hydroxy-N1-P-Tolyl-N2-b-naphthyl benzamidine hydrochloride. The coloured mixed chelate absorbs at 470 nm with molar absorptivity 3600±50 litre mole-1 cm-1. Beer’s law is obeyed in the rage 2-20 ppm of molybdenum. The optimum acidity range is 1.8-4.2 M HCl. Most of the common ions generally associated with Molybdenum ores and alloys do not interfere. The method has been used for determination of Molybdenum in steels.

Hydroxyamidines; chelating agents; molybdenum; thiocynate