Spectrophotometric determination of microamounts of mercury(II) and sulfide ions in aqueous solution |
| |
Authors: | YS Varma Ishwar Singh BS Garg RP Singh |
| |
Institution: | Department of Chemistry, University of Delhi, Delhi-110007, India |
| |
Abstract: | Ammonium (2′,3′-dihydroxy pyridyl-4′-azo)benzene-4-arsonate (DHP-4A) provides a simple, rapid, and sensitive spectrophotometric microdetermination of mercury(II) in aqueous solution. The magenta colored 1:2 metal to ligand complex formed has a molecular extinction coefficient 6.25 × 104 liters mol?1 cm?1 at the maximum absorption of 535 nm in highly alkaline medium. Beer's law is obeyed up to 3.8 ppm and Sandell's sensitivity (for an absorbance of 0.001) is 0.0032 μg of mercury(II)/cm2. The mercury(II) complexed with DHP-4A has also been used in microdetermination of sulfide ions using ligand exchange reaction. The optimum concentration range of sulfide ions which can reproducibly be determined is 0.16-5.05 μg/10 ml and sensitivity of sulfide ions determination (for an absorbance 0.001) is 7.3 × 10?4 μg/cm2. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|