부산대학교 도서관

Alkylbenzenesulfonates together with soap are the most widely used anionic surfactants. Linear alkylbenzenesulfonates (LAS) were introduced in the mid-1960s as substitutes for the poorly biodegradable tetrapropylenebenzenesulfonates (TPS). A method is presented for the selective and quantitative determination of LAS and TPS in recent sediments. Alkylbenzenesuffonates were extracted from sediments using methanol. The methanolic extract was passed through a strong anionic exchange column. The alkylbenzenesttlfonates contained in the acidic eluate were then derivatized to their corresponding trifluoroethyl esters and quantitatively determined by gas chromatography/mass spectrometry using positive chemical ionization. Limits of quantitation for 10 g sediment samples varied between 1.5 and 21 [[micro]gram]/kg of dry sediment for single IAS isomers and between 71 and 220 [[micro]gram]/kg for total IAS. Limits of quantitation for the total of TPS were at [approximately equal to]200 [[micro]gram]/kg. Relative standard deviations of replicate analyses typically ranged from 5 to 10%. Recovery rates of LAS in spiked sediment samples ranged from 79 to 113%. The presented method was applied to surface and subsurface sediments also containing long-chain ([C.sub.14]-[C.sub.16])-LAS and mixtures of LAS and TPS.