Application of Headspace Liquid Phase Microextraction - Gas Chromatography for the Analysis of Trace Amounts of Isoamyl Acetate

Document Type : Research Note

Authors

1 Faculty of chemistry, North Tehran Branch, Islamic Azad University, P.O. Box 19585-936 Tehran, I.R. IRAN

2 Department of Chemistry, Science & Research Campus, Islamic Azad University, P.O. Box 14515-775 Tehran, I.R. IRAN

Abstract

The performance of Head-Space Liquid Phase Micro Extraction (HS-LPME), coupled with capillary gas chromatography, was assessed for the extraction and determination of ultra trace amounts of isoamyl acetate in some real samples. A 2.5 µL of benzyl alcohol was used as extracting solvent and experimental parameters impacting the performance of extraction were optimized as 1250 rpm stirring rate and 15 min extraction time at 30 oC with 0.34 g.mL−1 NaCl for increasing the of ionic strength of sample solution. Under the optimized conditions, the limit of detection calculated to be 0.50 µg/L. The linear range of calibration curve for isoamyl acetate was found 5-1300 µg/L with a correlation coefficient (R2) of 0.999. Tap water and liquid soap samples were successfully analyzed using the proposed method. The relative standard deviation of water samples spiked with isoamyl acetate at 0, 200 and 400 µg/L levels was from 2.79 to 2.39%; whereas for liquid soap it was 2.74% and 2.48% for standard addition and calibration curve methods respectively. Recovery for water samples were between 101.8-103.2%; and for liquid soap sample, 103.2% and 101.8% was obtained when standard addition and normal calibration curve were employed correspondingly.

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[1] Khezry B., Gobal F., Routes to CO2 Fixation:A BOC-MP Approch, in: "Iranian Physical Chemistry Seminar In Urmia", p.86 (2003).
[2] Gratzel M., "Energy Resources Through Photochemistry and Catalysis", Academic Press, NewYork,(1983).
[3] Hemminger J.E., Carr R., Samorlai G.A., The Photoassisted Reaction of Gaseous Water and Carbon Dioxide Adsorbed on theSrTiO3 (111) Crystal Face to form Methane, Chem. Phts. Lett, 57, p. 100 (1978).
[4] Inoue T., Fujishima A., Konishi S., Honda K., Photoelectrocatalyc Reduction of Carbon Dioxide in Aqueous Sudpensions of Semiconductor Power, Nature, 277, p. 637 (1979).
[5] Aurian-Blajein B., Halmann M., Manassen J., Photoreduction of Carbon Dioxide and Water into Formaldehyde and Methanol on Semiconductor Materials, Solar Energy, 25, p. 165 (1980).
[6] Halmann M., Ulman M., Bkajeni B.A., Photochemical Solar Collector for the Photoassisted Reduction of Aqueous Carbon Dioxide, Solar Energy, 31, p. 429 (1983).
[7] Chandrasekaran K., Thomas J.K., Photochemical Reduction of Carbonate to Formaldehyde on TiO2 Power, Chem. Phys. Lett., 99, p.7 (1983).
[8] Anpo M., Shima T., Kodama S., Kubokawa Y., Photocatalytic Hydrogenation of CH3CCH with H2O on Small-Particle TiO2 :Size Quantization Effects and Reaction Intermediates, J. Phys. Chem., 91, p. 4305 (1987).
[9] Linsebigler A.L., Lu G., Yates J.T., Photocatalysis on TiO2 Surfaces :Principles, Mechanisms and Selected Results, Chem. Rev., 95, p. 735 (1995).
[10] Hirano K., Inoue K., Yasu T., Photocatalysed Reduction of CO2 in Aqueous TiO2 Suspension Mixed with Copper powder, J. Photochem. Photobilo, A: Chem., 64, p. 255 (1992).
[11] Ishitani O., Inoue K., Suzuki T., Ibusuki T., Photocatalytic Reduction of Carbon Dioxide to Methanol and Acetic Acid by an Aqueous Suspension of Metal-Deposited TiO2, J. Photochem. Photobilo, A:Chem.,72, p. 269 (1993).
[12] Valchopoulos N., Liska P., Augustynski J., Gratzel M., Very Efficient Visible Light Energy Harvesting and Conversion by Spectral Sensitization of High Surface Area Polycrystalline Titanium Dioxide Films, J. Am. Chem. Soc., 110, p. 1216 (1988).
[13] Ulmann M., Tinnemens A.H.A., Mackor A., Aurian-Blajeni B., Halmann M., Photoreduction of Carbon Dioxide to Formic Acid, Formaldehyde, Methanol, Acetaldehyde and Ethanol Using Aquoes Suspensions of Strontium Ttitanate with Transition Metal Additives, Int. J. Solar Energy, 1, p. 213 (1982).
[14] Raphael M.W., Malati M.A., The Photocatalysed Reduction of Aqueous Sodium Carbonate to Carbon Using Platinised Titana , J. Chem. Soc., Chem. Commun., p. 1418 (1987).
[15] Frese K.W., Electrochemical Reduction of CO2 at Intentionally Oxidized Copper Electrodes, J. Electrochem. Soc., 138, p. 3338 (1991).
[16] Solymosi F., The Bonding, Structure and Reactions of CO2 Adsorbed on Clean and Promoted Metal Surfaces, J. Mol. Catal., 65, p. 337 (1991).
[17] Yamashita H., Kamada N., He H., Tanaka K., Ehar S., Anpo M., Reduction of CO2 with H2O on TiO2 (100) and TiO2 (110) Single Crystals Under UV-Irradiation ,Chem. Lett., p. 855 (1994).
[18] Anpo M., Aikawa N., Kubokawa Y., Che M., Louis C., Giamello E., Photoformation and Structure of O2-and Nitrogen Containing Anion Radicals Adsorbed on Highly Dispersed Titanium Oxide Anchored on to Porous Vycor Glass, J. Phys. Chem., 89, p. 5689 (1985).
[19] Yamashiata H., Ichihashi Y., Harada M., Stewart G., Fox M.A., Anpo M.,Photocatalytic Degradation of 1-Otanol on Anchored Titanium Oxide and on TiO2 Powder Catalysts, J. Catal., 158, p. 97 (1996).
[20] Spanhel L., Hasse M., Weller H., Henglein A., Photochemistry of Colloidal Semiconductors 20. Surface Modification and Stability of Strong Luminescing CdS Particles, J. Am. Chem. Soc., 109, p. 5649 (1997).