LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

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OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS) 1 IDENTITY SIDS Initial Assessment Report 1.1 Identification of the Substance Category CAS Number: 1322-98-1 Decylbenzene sulfonic acid, sodium salt 25155-30-0 Dodecylbenzene sulfonic acid, sodium salt 26248-24-8 Tridecylbenzene sulfonic acid, sodium salt 27636-75-5 Undecylbenzene sulfonic acid, sodium salt 68081-81-2 C10-16 Monoalkylbenzene sulfonic acid, sodium salt 68411-30-3 C10-13 Alkylbenzene sulfonic acid, sodium salt 69669-44-9 C10-14 Alkyl deriv benzene sulfonic acid, sodium salt 85117-50-6 C10-14 Monoalkylbenzene sulfonic acid, sodium salt 90194-45-9 C10-13 Alkyl deriv benzene sulfonic acid, sodium salt 127184-52-5 4-C10-13-sec Alkyl deriv benzene sulfonic acid, sodium salt Chemical Name: Linear Alkylbenzene Sulfonate (LAS) Description LAS is the primary cleaning agent used in many laundry detergents and cleaners at concentrations up to 25 percent in consumer products, somewhat higher in industrial/commercial products. The LAS molecule contains an aromatic ring sulfonated at the para position and attached to a linear alkyl chain at any position except the terminal carbons (Valtorta et al., 2000). The linear alkyl carbon chain typically has 10 to 14 carbon atoms, with the approximate mole ratio varying somewhat regionally with weighted averages of 11.7-11.8. The alkyl chains are >95% linear. The structure of C12-LAS, representative of the category, is shown in the figure. While commercial LAS consists of more than 20 individual components, the ratio of the various homologues and isomers, representing different alkyl chain lengths and aromatic ring positions along the linear alkyl chain, is relatively constant across the various detergent and cleaning applications. Because of the close consistency of the mixtures, their commercial uses, fate and effects, LAS is discussed as a category rather than as individual CAS numbers in this assessment. CH 3 (CH 2 ) 5 CH(CH 2 ) 4 CH 3 S0 - Na + 3 Molecular Weight Range depending on alkyl chain length from 338 (C11.3) to 356 (C12.6) The approximate weight percentage of the alkyl chain varies somewhat regionally as shown below. UNEP PUBLICATIONS 8
OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS) Region C14 Canada 68081-81-2 Europe 25155-30-0 68081-81-2 68411-30-3 85117-50-6 90194-45-9 127184-52-5 Japan 68081-81-2 68411-30-3 69669-44-9 United States 1322-98-1** 25155-30-0 26248-24-8** 27636-75-5** 68081-81-2 69669-44-9 85117-50-6 90194-45-9 Range of Averages ≤1
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LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

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