Determination of Trace Heavy Metal Ions in Water by FAAS after Preconcentration with ASTO

Abstract:

A new method of preconcentration with nanometer-strontium titanate immobilized on aluminum oxide (ASTO) combined with flame atomic absorption spectrometry (FAAS) was proposed for the determination of trace heavy metal ions, included Cu²⁺, Ni²⁺ and Ag⁺, in environmental water. The optimum experimental parameters for preconcentration of the heavy metals studied, such as pH, shaking time, eluent and coexisting ions, have been investigated. The results showed that Cu²⁺, Ni²⁺ and Ag⁺, could be quantitatively retained by the ASTO in the pH range of 5-8, and then eluted completely with 2 mol·L^-1 HNO₃. The detection limits of this method for Cu²⁺, Ni²⁺ and Ag⁺ were 0.031μg·L^-1, 0.15μg·L^-1and0.041μg·L^-1 with an enrichment factor of 50, respectively. The method has been applied to the simultaneous determination of trace amounts of Cu²⁺, Ni²⁺ and Ag⁺ in environmental water, the recoveries were all in 95%-105%.

• Periodical: Advanced Materials Research (Volume 826)
• Pages: 267-270
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.826.267
• Online since: November 2013
• Authors: En Jun Song*
• Keywords: Ag, Concentration, Cu, Flame Atomic Absorption Spectrometry, Nanometer-Strontium Titanate Immobilized on Aluminum Oxide, Ni, Water

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