Abstract
M.Tech. (Chemistry)
The determination of trace metals in different matrices is very important since human
intake of toxic trace elements which even at low doses over a long period of time can lead
to malfunction of organs and could cause chronic toxicity. Hence, it is necessary to obtain
more information about the levels of these trace metals in different matrices in order to
determine their potential toxicity. Therefore, the main objective of this research was to
develop or improve selected sample pre-treatment methods for pre-concentration and
extraction of thallium, tin and antimony in food and environmental matrices followed by
their quantification using inductively coupled plasma optical spectrometry (ICP-OES).
In this dissertation, different sample preparation methods for determination of total
antimony, tin and thallium in food and environmental samples are presented. These
methodologies include ultrasound-assisted ionic liquid-dispersive liquid phase
microextraction (UA-IL-DLLME), ultrasound-assisted dispersive solid phase
microextraction (UA-DSPME) and ultrasound assisted-cloud point extraction (UA-CPE).
The developed techniques allowed simple, fast, precise, accurate and effective extraction of
Sb, Sn and Tl in complex matrices. Certified reference materials and standard reference
material such as CRM-TM 26.3 (low level fortified standard for trace-elements), NIST
SRM 1643e (trace elements in water); and CRM-TMDA-52.3 were analyzed for Sb, Sn
and Tl to evaluate the applicability and validity of the developed sample preparation
methods.
The developed methodologies are summarized below:
Determination of antimony and tin in beverages using inductively coupled
plasmaoptical emission spectrometry after ultrasound-assisted ionic liquid
dispersive liquid-liquid phase microextraction. This work reported for the first time
the use of low density Aliquat 336 ionic liquid combined with n-butyl acetate in
UA-IL-DLLME method for preconcentration of Sb and Sn in beverage samples.
The developed method was simple, fast and environmentally friendly.
Determination of thallium in water samples using inductively coupled plasma
optical emission spectrometry (ICP-OES) after ultrasonic assisted-dispersive solid
phase microextraction. The main attractive feature of the work includes selectivity,
short analysis time and sensitivity towards thallium analysis...