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Qualitative and quantitative analysis of linear Alkyl Benzen compounds in Detergents by Gas-liquid Chromatography technique | ||
| Tikrit Journal of Pure Science | ||
| Article 1, Volume 15, Issue 3, 2010, Pages 28-40 | ||
| Authors | ||
| Ali Ibraheem Khaleel; Abdul Majeed K.Ahmed; Ali J.Arief | ||
| Abstract | ||
| In this research an accurate, precise and sensitive method was developed for the determination of the Linear Alkyl Benzene (LAB) compounds (Decyl, undecyl, Dodecyl and Tridecyl) benzene using ( GC Varian 3300, GC-MS Varian 3800 with FID detector). Two packed columns (SE-30 and OV-101) and three capillary columns with different polarity of liquid stationary phases ( SPB-1, CB-sill13CB and VF-5ms) have been used. The optimum conditions for analysis of these compounds using the best capillary column (VF-5ms) were: column temperature 180C0, detector temperature 275C0, injector temperature 250C0 sample size 0.25 µl with flow rate of 2.5ml/min for Nitrogen as a carrier gas. GC-MS Varian 3800 was also used for identification of these compounds and was found that their elution sequence was (decyl, undecyl, Dodecyl and tridecyl) benzene respectively. The calibration curve and area normalization methods have been applied for quantitative determination. These two methods give an accuracy wherein the relative error was between (-0.072 to 0.904) while the precision (RSD%)was not more than ( 0.7 ) with recovery between 98.59-99.8%. The detection limits were (7.6 ×10-5, 3.3×10-4, 3.4×10-4 and 1.2×10-4) molar for (Decyl, undecyl, Dodecyl and tridecyl) benzene respectively. This method was applied on samples : 1- Standard from (ARADET/Baiji/Iraq) contains all isomers for each compound, (relative error between -0.79 to 0.95). 2- Products in (ARADET), (relative error between -1.7 to 1.58). 3- From Syrian united company for Petrochemical industry. The comparison of the results obtained from this method with the results of Spanish Pernz Company for the same sample has shown relative error in the range of ( -0.042 to 1.09). The storage of linear alkyl benzene at different temperatures have no effect on its composition. | ||
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