Chemicals of Emerging Concern Emitted from Water-Based Paints: Experiments and Modeling

Area of Science:

• Environmental Chemistry
• Indoor Air Quality
• Chemical Exposure Assessment

Background:

• Water-based paints, perceived as eco-friendly, emit chemicals of emerging concern (CECs).
• These emissions can pose significant health risks in indoor environments.
• Understanding CEC emission dynamics is crucial for indoor air quality management.

Purpose of the Study:

• To characterize emissions of CECs from water-based paints.
• To develop and validate a model for predicting CEC emission profiles.
• To assess the impact of paint formulation and substrate on emission patterns.

Main Methods:

• Experimental testing of four CECs with varying volatility.
• Development and validation of a dynamic mass transfer model.
• Classification of 20 common CECs based on emission profiles (short, medium, long-term).

Main Results:

• High-volatility CECs show rapid peak-and-decay emissions; low-volatility CECs exhibit persistent emissions (>100 days).
• Partition coefficient (Kpa) and diffusion coefficient (Dp) are key emission parameters.
• Model predicts short (<10 days), medium (10-100 days), and long-term (>1000 days) emission profiles for various CECs.

Conclusions:

• Water-based paints contribute to prolonged indoor exposure to low-volatility CECs.
• The developed model accurately predicts CEC emission behavior.
• Findings support improved risk assessments and safer product development for paints.