Chemical modification of alumina surface by immobilization of 1-((5-nitrofuran-2-yl)methylene)thiosemicarbazide for extractive concentration of silver ions

• Published in: International journal of environmental analytical chemistry 2013-03, Vol.93 (3), p.265-278
• Main Authors: Sabermahani, Fatemeh, Taher, Mohammad Ali, Bahrami, Habibe, Hassani, Zahra
• Format: Article
• Language: English
• Subjects: Alumina; Aluminum oxide; Analytical chemistry; environmental sample; Environmental testing; Extraction; Extraction processes; Flour; Ions; Linearity; Oryza sativa; Phase transitions; preconcentration; Silver; Solid solutions; Sorption; Standard deviation; thiosemicarbazide derivative; Triticum aestivum
• ISSN: 0306-7319; 1029-0397
• DOI: 10.1080/03067319.2011.620707

A column, solid phase extraction (SPE), preconcentration method was developed for determination of silver by using alumina coated with 1-((5-nitrofuran-2-yl)methylene)thiosemicarbazide and determination by flame atomic absorption spectrometry. The separation/preconcentration conditions for the quantitative recovery were investigated. At pH 2, the maximum sorption capacity of Ag + was 7.5 mg g −1 . The linearity was maintained in the concentration range of 0.02-11.0 µg mL −1 in the final solution or 0.14-1.10 × 10 4  ng mL −1 in the original solution for silver. The preconcentration factor of 140 and relative standard deviation of ±1.4% was obtained, under optimum conditions. The limit of detection (LOD) was calculated as 0.112 ng mL −1 , based on 3σ bl /m (n = 8) in the original solutions. The proposed method was successfully applied to the determination trace amounts of silver in the environmental samples such as tea, rice and wheat flour, mint, and real water samples.