The interaction of tungsten(VI) with 2-hydroxy-5-bromothiophenol (HBTP) in the presence of aminophenols (APs)was studied as follows:(N,N-diethylaminomethylthio)-4-methoxyphenol (AP 1), 2-(N,N-dibuthylaminomethylthio)-4-methoxyphenol (AP 2), 2,6-bis-(N,Ndimethylaminomethyl)-4-methylphenol (AP 3), 2,6-bis-(N,N-dimethylaminomethyl)-4-chlorophenol (AP 4), 2-(N,N-dimethylaminomethyl)-4-methylphenol (AP 5), 2-(N,N-diethylaminomethyl)-4-bromophenol (AP 6) and 4-chloro-2-(N,N-dimethylaminomethyl)-6-thiophenylmethylphenol (AP 7).The obtained ternary complexes have a composition of 1:2:2 (W:HBTP:AP) or 1:2:1 (AP 3 and AP 4). The optimum conditions for their formation and subsequent solvent extraction were found: organic solvent (chloroform), pH (4.1-5.6), concentration of reagents and extraction time. Degrees of extraction made up 98.1-98.6%. The complexes have absorption maximum at 470-482 nm and molar absorptivity coefficients ranged between (2.6-3.9)10 4. The Beer's law is observed in the range of concentrations of tungsten 0.2-16 µg/ml.

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