LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

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