XII Iberian Meeting of Electrochemistry XVI Meeting of the ...
XII Iberian Meeting of Electrochemistry XVI Meeting of the ...
XII Iberian Meeting of Electrochemistry XVI Meeting of the ...
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<strong>XII</strong> <strong>Iberian</strong> <strong>Meeting</strong> <strong>of</strong> <strong>Electrochemistry</strong> & <strong>XVI</strong> <strong>Meeting</strong> <strong>of</strong> <strong>the</strong> Portuguese Electrochemical Society O B 06<br />
Water soluble phthalate determination from bottled and<br />
coolers water by using Square Wave Voltammetric(SW V)<br />
technique<br />
Munawar Saeed Qureshi, Sirajuddin<br />
National Centre <strong>of</strong> Excellence in Analytical Chemistry University <strong>of</strong> Sindh, Jamshoro 76080,<br />
Pakistan.<br />
munwar_saeed@yahoo.com<br />
Phthalic acid esters (dialkyl or alkyl aryl esters) known as phthalates are<br />
commonly used as plasticizers in <strong>the</strong> polymer industry. Phthalates are widely used as<br />
additives in nail polish, printer inks, insecticides, toys, PVC, lubricants, food wraps,<br />
blood bags, ca<strong>the</strong>ters, etc. Phthalates are not chemically bound to <strong>the</strong> polymers and can<br />
diffuse out <strong>of</strong> <strong>the</strong> plastic and leach into <strong>the</strong> environment. The interest about phthalate<br />
esters is growing due <strong>the</strong>ir significant use and potential toxicity. Hence an efficient<br />
analytical method is needed for assaying <strong>of</strong> phthalates in various polymer products<br />
essential for safe monitoring <strong>of</strong> phthalates[1-4].<br />
In our present study, a fast, simple and highly sensitive Square Wave<br />
Voltammetric (SWV) method was developed for evaluation <strong>of</strong> total water soluble<br />
phthalates by taking 95% aqueous di-n-butyl phthalate (DBP) as a model at glassy<br />
carbon electrode (GCE). The study showed that 100 µM aqueous solution <strong>of</strong> DBP gives<br />
best response with 0.05 M Tetra butyl ammonium bromide (TBAB), at stirring rate <strong>of</strong><br />
1400 rpm, deposition time, 20 s and pH value, 4.0±0.1. The optimum frequency and<br />
scan rate was 100 Hz and 0.9 V/s respectively. SW Voltammetric response was linear in<br />
3 ranges, 70110 µM, 2060 µM and 210 µM with regression coefficient <strong>of</strong> 0.9873,<br />
0.9978 and 0.9935 respectively and limit <strong>of</strong> detection (LOD), 0.47 µM for total water<br />
soluble phthalates in aqueous medium. Under <strong>the</strong> same conditions Differential Pulse<br />
Voltammetry (DPV) gave a linear range <strong>of</strong> 0.5 4.5 µM with R value <strong>of</strong> 0.999 and<br />
detection limit <strong>of</strong> 0.05 µM. The developed method was successfully applied for total<br />
phthalates determination in various samples <strong>of</strong> water stored in PVC coolers and plastic<br />
bottles. The validity <strong>of</strong> <strong>the</strong> result was checked with reported method and good<br />
agreement was noticed between <strong>the</strong>m.<br />
-40.0u<br />
I (A)<br />
-30.0u<br />
-20.0u<br />
-10.0u<br />
-1.20 -1.30 -1.40 -1.50 -1.60 -1.70 -1.80<br />
U (V)<br />
(V)<br />
Fig.1 - SW voltammograms <strong>of</strong> triplicate water sample from PVC cooler (Eagle Star)<br />
References<br />
[1] L. Guiseppe, V.D. Antonio, M. Marika, V. Alberto, F.D. Claudio, Toxicology, 2006, 226, 90.<br />
[2] X. Zhiyong, E. Ralf, T. Christin, L. Rainer, C. Armando, R. Wolfgan, Environ. Sci, Technol.<br />
2007, 41, 4555.<br />
[3] B.Tamar, C.H. Drorit, C.M. Antonia, N.L. Calafat, A.Yona, W. Uri, R. Elhu, Envir. Int, 2009,<br />
35, 353.<br />
[4] E. Makoto, M. Emiko, K. Kunio, Rep. Toxicol, 2000, 14, 13.<br />
September, 811, 2010. ISEL - Lisbon 39
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