Updated Analysis of Mercury Complex solution with Rhodamine-B and Spectrophotometric Determination of Trace Amounts of Mercury in Wastewater

Abstract

β-correction principle has been applied for the determination of
mercury complex characteristics with rhodamine B (RDB) in the
presence of iodide and in acidic solution, for example, complexation
ratio, true molar absorptivity and stability constant. In addition, the
determination of trace amounts of mercury in wastewater was
analyzed. The results showed that the formed complex was
Hg(RDB)₃I_n, the cumulative stability constant K_c was equal to
3.55 x 10¹⁶ and its true (not apparent) molar absorptivity
 ε = 1.61 X 10⁵ 1 mole^-1 cm^-1.  Beer's law was obeyed for 0-1.0
mg/L mercury. This method has been satisfactory for the determination
of mercury in wastewater.