سال انتشار: ۱۳۸۷

محل انتشار: همایش بین المللی ژئولیت ایران

تعداد صفحات: ۸

نویسنده(ها):

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
ahmad imani –

چکیده:

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.