Stopped-flow injection kinetic determination of multicomponent samples: Simultaneous determination of mercury(II) and silver(I)

✍ Scribed by Jianhua Wang; Ronghuan He

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 393 KB
• Volume: 294
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)80194-0

✦ Synopsis

A catalytic method is proposed for the simultaneous determination of mercury(II) and silver(I) based on their catalytic effect on the ligand substitution reaction rate between hexacyanoferrate(II), [FefCN),J4-and a,a'-bipyridyl. The reaction was monitored with a stopped-flow injection method and detected spectrophotometrically at 536 mu. Most of the commonly coexisting foreign ions do not interfere with the determination, except for Fe3+, Co'+ and Zn'+. The calibration graphs are linear in the ranges O-75 ng ml-' HgfII) and O-64 ng ml-' A&), and the detection limits are 0.5 ng ml-' IIgGI) and 1.0 ng ml-' AgfI), respectively. Mercu&I) and silver(I) content in tap water, wastewater and a synthetic sample has been determined with the proposed procedure, the relative standard deviations being 3.52-5.20% for mercury (II) and 3.2&4.39% for silvet0).