LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS)
I. Identification Information
Format C: Modeling Evaluation #2
(1) Activity associated with Modeling Information
Consumer Use (i.e., down-the-drain release) -
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 exposures) as a result of daily consumer usage of laundry and cleaning products.
(2) Description of Modeled Scenario
Down-the-drain release of total USA annual production volume into total volume of USA municipal
wastewater system. Accounts for wastewater treatment and in-stream dilution. Accounts for
bioaccumulation potential.
III. Description of Model and Model Validation
(1) Tool or Model
E-FAST
(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
Release – 350,000 tonnes (total US annual production)
Wastewater treatment removal – 99%
BCF estimate – 87 L/kg
NOEC – 270 µg/L
(3) Model Outputs
Results following wastewater treatment;
Aquatic exposure -
Mean stream flow concentration = 0.099 µg/L
7Q10 stream flow concentration = 1.3 µg/L
[7Q10 is the lowest 7-day average flow in a year that occurs on average once every 10 years ]
Indirect human exposure estimates under low stream flow (7Q10) conditions are:
Drinking water exposure -
Average Daily Dose (ADD) =
1.9E-06 mg/kg/day (chronic non-cancer)
Fish consumption exposure –
Average Daily Dose (ADD) =
7.2E-07 mg/kg/day (chronic non-cancer)
UNEP PUBLICATIONS 83