Preconcentration and photometric estimation of molybdenum in seawater, particulate matter and sediments of Visakhapatnam (Bay of Bengal) |
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| Authors: | S Kanna Babu MV Krishna Murthy D Satyanarayana |
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| Institution: | Department of Chemistry, Andhra University, Waltair-530 003, India |
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| Abstract: | A sensitive and selective photometric method of estimation of molybdenum has been developed based on the formation of a mixed ligand complex with bromopyrogallol red (BPR) and tri-n-octyl phosphine oxide (TOPO) and its subsequent extraction into nitrobenzene. The method is made selective by effectively eliminating the interference of several metal ions that commonly associate with molybdenum through the addition of nitrilotriacetic acid (NTA) and fluoride as masking agents. The proposed method is simple, rapid, fairly reproducible and superior to the existing methods for the photometric estimation of molybdenum in seawater. The concentration of molybdenum in harbour, coastal and offshore waters, particulate matter and sediments of Visakhapatnam (Bay of Bengal) was determined using this method. The results showed little variation of molybdenum concentration with depth in coastal waters, whereas its distribution was dominantly controlled by the salinity variation due to fresh water mixing. |
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