Determination of Trace Amount of Silver by Atomic-Absorption-Spectrometry-Coupled Flow Injection On-Line Coprecipitation Preconcentration Using DDTC–Copper as Coprecipitate Carrier

✍ Scribed by Xueqing Mao; Hengwu Chen; Jinsong Liu

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 90 KB
• Volume: 59
• Category: Article
• ISSN: 0026-265X
• DOI: 10.1006/mchj.1998.1581

✦ Synopsis

A flow injection on-line coprecipitation preconcentration system with diethyldithiocarbamate (DDTC) chelate of copper used as the coprecipitate carrier was coupled with flame atomic absorption spectrometry (FAAS) for the determination of trace silver. Silver was on-line coprecipitated with DDTC-Cu(II) in 0.5 moL ⅐ L Ϫ1 HCl, and the precipitate was collected in a knotted reactor. The precipitate was then dissolved by isobutyl methyl ketone and transported directly into the nebulizerburner system of a flame atomic absorption spectrometer. A detection limit (3) of 0.6 g ⅐ L Ϫ1 was achieved for a loading period of 30 s, a relative standard derivation of 2.0% was obtained for 11 determinations of 20 g ⅐ L Ϫ1 Ag(I). Interference-free levels were 10 mg ⅐ L Ϫ1 for Cd 2ϩ , 50 mg ⅐ L Ϫ1 for Cu 2ϩ , 50 mg ⅐ L Ϫ1 for Mn 2ϩ , 25 mg ⅐ L Ϫ1 for Ni 2ϩ , 100 mg ⅐ L Ϫ1 for Pb 2ϩ , 50 mg ⅐ L Ϫ1 for Zn 2ϩ , 500 mg ⅐ L Ϫ1 for Fe 3ϩ , and 2000 mg ⅐ L Ϫ1 for Fe 2ϩ reduced from Fe 3ϩ by ascorbic acid. The developed method has been successfully applied to the determination of trace amount of silver in geological samples.