Synthesis, characterization and use of Silica Gel Phases with chemically immobilized 2-Aminothiophenol for pre-concentration and determination of trace amounts of lead by Flame Atomic Absorption Spectrometry
Publish place: Iran International Zeolite Conference
Publish Year: 1387
نوع سند: مقاله کنفرانسی
زبان: English
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ZEOLITE01_124
تاریخ نمایه سازی: 30 دی 1387
Abstract:
Developing an appropriate, cost effective and at-hand method for determination of trace amounts of
heavy metals in the water bodies is an on-demanding job due to the rate of present industrialization and the
need for aquatic ecosystem health monitoring. An analytical method using silica gel chemically modified
with 2-aminothiophenol for pre-concentration and subsequent determination of lead using flame atomic
absorption spectrometry (FAAS) was developed. In order to determine optimum conditions of quantitative
solid phase extraction of lead by 2-aminothiophenolpropyletrimetoxysilane (AmPTMS), parameters such as
pH and flow rate were investigated. The aromatic group, 2-Aminothiophenol can be utilized in grafting
reactions of silica gel surface, using 3-chloropropyletrimetoxysilane as a bridging molecule. Optimum
conditions for pH and flow rate of recovery and pre-concentration of lead from its aqueous solution were 5.0
and 1.0 ml min-1, respectively. A 4.12 ng/ml detection limit for the pre-concentration of aqueous solution of
lead was obtained. AmPTMS showed to be an efficient system for metal pre-concentration. The proposed
method was simple, accurate and cost effective, especially when more sophisticated techniques such as GFAAS
or ICP-OES are not available. The proposed procedure has been successfully applied for lead
determination at μg levels in industrial and river water samples.
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Authors
Zoheir Shokouh Saljoghi
Department of Fisheries and Environmental Sciences, Faculty of Natural Resources, University of Tehran, Karaj, Tehran, Iran.
amir Shokouh Saljoghi
Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran
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