Five novel reagents were suggested for mercury (II) photometric determination: 2- hydroxythiophenol and its derivatives (HTDs), namely 2,5-dihydroxythiophenol, 2-hydroxy-5- fluorothiophenol, 2-hydroxy-5-chlorothiophenol, 2-hydroxy-5 – bromothiophenol, 2- hydroxy – 5- iodothiophenol. The molar absorptivity coefficient was (2.4-3.3)×104 (λ=450-480 nm). The optimal conditions for the complexation reaction correspond to pH range of 4.1 – 7.2. It has been proven that a compound with different ligands is formed in the ratio of Hg (II):HTDs:Py=1:2:2.
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