Alkyl benzene sulphonates, linear

Trehy et al. [5] determined linear alkyl benzene sulphonates in sediments in amounts down to 0.5mg kg-1 using this technique. 

This technique has been used to determine linear alkyl benzene sulphonates in sludges [9, 11]. 

Linear alkyl benzene sulphonates Li Chrosorb 0.05M NaC104, acetonitrile (2 3) Fluorometric excite, 225nm emission 275nm lOng O.lmg IP1 [84]... 

Other organic compounds that have been determined in sewage effluents include the following (see Table 15.13) hydrocarbons, alcohols, carboxylic acids, esters, chlorobenzenes, nitrosamines, ethylene diamine tetraacetic acid, nitriloacetic acid, organophosphorus compounds, linear alkyl benzene sulphonates, methyl mercaptan, polychlorobiphenyls and chlorinated insecticides. 

Another material on the horizon is MLABS (modified LABS), a branched chain development for lower wash temperatures. Procter Gamble patented this material in the late 1990s but it has not found commercial support due to the low margins in the industry and the need for substantial investment to modify the feedstock. Interest in MLABS remains as the modifications have overcome most of the performance deficiencies of linear alkyl benzene sulphonate (LABS). 

Roberts, D.W. 1989. Aquatic toxicity of linear alkyl benzene sulphonates (LAS) - a QSAR analysis. Communicaciones Presentadas a las Jomadas del Comite Espanol de la Detergencia, 20 (1989) 35-43. Also in J.E. Turner, M.W. England, T.W. Schultz and N.J. Kwaak (eds.) QSAR 88. Proc. Third International Workshop on Qualitative Structure-Activity Relationships in Environmental Toxicology, 22-26 May 1988, Knoxville, Tennessee, pp. 91-98. Available from the National Technical Information Service, US Dept, of Commerce, Springfield, VA... 

Anionics. Linear alkyl benzene sulphonates (LAS) can be determined by HPLC by a number of procedures. The following examples demonstrate different separation and detection conditions. 

Figure 9.3 Separation of linear alkyl benzene sulphonate isomers (column 150 x 4.6 mm i.d. of 5 micron Hypersil SAS, gradient 35 65 acetonitrile disodium hydrogen phosphate (aq.), to 75 25, UV detection at 254 nm).

Linear alkyl benzene sulphonates (LABS) are manufactured from alkyl benzene, and the alkyl chain length can vary from Cg to C15 their properties are mainly influenced by the average molecular weight and the spread of carbon number of the alkyl side chain. The c.m.c. of sodium dodecyl benzene sulphonate is 5 x 10 mol dm (0.18%). The main disadvantages of LABS are their effect on the skin and hence they cannot be used in personal care formulations. 

Organophosphorus compounds Linear alkyl benzene sulphonates... 

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