LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

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OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS) (3) Remarks The aquatic NOEC is 270 µg/L. The mean surface water concentrations measured in 50 river locations across the U.S. ranged from
OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS) I. Identification Information Format C: Modeling Evaluation #1 (1) Activity associated with Modeling Information Manufacturing Facility Effluent Discharge - Environmental Exposure Including Indirect Human Exposure II. Modeling Objective (1) Modeling Study Objective High end to bounding estimate of surface water concentration (including drinking water and fish consumption exposure) as a result of manufacturing facility effluent discharge. (2) Description of Modeled Scenario Daily release estimated from a hypothetical manufacturing facility anywhere in the US producing 20% of annual US volume. Accounts for wastewater treatment, in-stream dilution and bioaccumulation potential. Assumes 365 days of operation per year. III. Description of Model and Model Validation (1) Tool or Model E-FAST – Provides screening level estimates of the concentrations of chemicals released to the environment from industrial discharge. Designed to provide high end to bounding estimates of exposure. Chemical-specific and facility-specific data or defaults can be used. Modeling conducted February 2003. (2) Validation/ Peer Review Standard model (beta release) used by USEPA Office of Pollution Prevention and Toxics in screening level assessments (3) Availability and Documentation www.epa.gov/oppt/exposure/docs/efast.htm IV. Inputs, Outputs, and Quality Description (1) Media Modeled Surface water, drinking water and edible fish tissue (2) Inputs Pre-treatment facility release (process loss) – 290 kg/day; estimated as follows: -350,000 tonnes/yr – annual production in US - 958 tonnes/day– daily production assuming 365 days/yr - 1.4 tonnes/day – daily process loss assuming 0.15% loss USEPA default value - 0.29 tonnes/day (290 kg/day) plant release assuming hypothetical facility produces one-fifth the total annual production, (there are 22 production sites in the US, Colin A. Houston 2002), a conservative assumption is that the maximum daily process loss for a single facility is 0.29 tonnes/day (290 kg/day) SIC Code is Soaps, Detergents, etc. Manufacture (2841-2844) Release days – 365 Wastewater treatment removal – 99%—reasonable based on monitoring data and likelihood that microbes downstream of LAS production facilities will be well acclimated BCF – 87 L/kg—maximum value based on Tolls et al. 1997 (22-87 L/kg for C10.6-C11.6 LAS) and recently published mean values of 23-80 L/kg for four species for C12 LAS by Versteeg and Rawlings 2003. NOEC = 270 µg/L Thus, conservative estimates are used in the determination of several of the input parameters and the UNEP PUBLICATIONS 81
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LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

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