LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

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OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS) Remarks: Not applicable. 2.8 AUTO FLAMMABILITY (solid/gases) Remarks: Not applicable. 2.9 FLAMMABILITY Remarks: Not applicable. 2.10 EXPLOSIVE PROPERTIES Remarks: Not applicable. 2.11 OXIDISING PROPERTIES Remarks: Not applicable. 2.12 OXIDATION: REDUCTION POTENTIAL Remarks: Not applicable. 2.13 ADDITIONAL DATA A. Henry’s law constant Value: 6.37 x 10 -3 Pa m 3 /mole Method: Estimation: EPI Suite GLP: Yes [ ] No [X] ? [ ] Test Substance: LAS (CAS #25155-30-0) Remarks: Calculated using the bond method detailed in Meylan and Howard (1991) and the input parameters resident in the EPI Suite database. Assumes 25°C, molecular weight 348.48. Data reported in EPI Suite as 6.29 x 10 -8 atmm 3 /mole and converted to Pa m 3 /mole. Reference: 1) USEPA. 2000. EPI Suite v3.10. 2) Meylan, W.M. and Howard, P.H. 1991. Bond contribution method for estimating Henry’s law constant. Environ. Toxicol. Chem. 10:1283-1293. Reliability: 2 Valid with restrictions. Standard EPA estimation software. UNEP PUBLICATIONS 128
OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS) 3. ENVIRONMENTAL FATE AND PATHWAYS 3.1 STABILITY 3.1.1 PHOTODEGRADATION (a) Type: Air [ ]; Water [X]; Soil [ ]; Other [ ] Light source: Sunlight [ ]; Xenon lamp [ ]; Other [X] Mercury vapor lamp Light spectrum: 200-350 nm Concentration: Initial LAS concentration 60 to 182 mg/1 Temperature: 28°C Direct photolysis Degradation: >95 % (weight/weight) after 20 minute (exposure time) Indirect Photolysis Degradation: Rapid photodegradation Method: A series of photodegradation studies were conducted. Aqueous solution of LAS (pH 6.75) were passed through an irradiated tubular flow reactor. Reaction rates were obtained for both non-sensitized conditions and when ferric perchlorate (0.04 to 3.15 x 10 -4 g-mole/L) was used as a sensitizer. A Hanovia 1200-watt mercury-vapor lamp was the source of radiation. The LAS concentration was determined by the methylene blue method. Appropriate controls were used. GLP: Yes [ ] No [X] ? [ ] Test substance: LAS; activity: 95% (CAS #25155-30-0) Remarks: Complete conversion of LAS to intermediates at an average residence time as low as 1 minute. The maximum conversion to CO2 was obtained at a residence time of 20 minutes and corresponded to 7 moles CO2 per mole of LAS. Reaction rate increases by two orders of magnitude in presence of ferric perchlorate. Half order kinetics with respect to light intensity and LAS concentration explained the data for nonsensitized conditions. An appropriate rate equation could be derived by assuming a second-order deactivation of light-activated LAS molecules. The sensitized reaction was believed to occur by abstraction of hydrogen atoms from LAS by hydroxyl radicals. Hydroxyl radicals presumably are produced by an electron-transfer reaction involving light-activated ferric ions. The mechanism is complex; over-all kinetics indicated a first-order effect of (Fe +3 ), 1.2 order in light intensity, and maxima in the rate for intermediate LAS and O2 concentrations. Reference: Matsuura, T. and Smith, J.M. 1970. Kinetics of photodecomposition of dodecyl benzene sulfonate. Ing. Eng. Chem. Fund. 9:252-260. Reliability: 2 Valid with restrictions (b) Type: Air [ ]; Water [X]; Soil [ ]; Other [ ] Light source: Sunlight [ ]; Xenon lamp [X]; Other [ ] Spectrum: >330 nm Concentration: 50 mg/L Temperature: 25°C; during photolysis the solution temperature reached 35-40 o C. Indirect Photolysis: Type of sensitizer: TiO2 suspension Degradation: Rapid photodegradation of LAS (
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LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

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