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Determination of low-density polyethylene–water partition coefficients for novel halogenated flame retardants with the large volume model and co-solvent model
- Source :
- Chemosphere. 277:130235
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The partition coefficient (Kpew) of an analyte between low-density polyethylene (LDPE) film and water is a critical parameter for measuring freely dissolved concentrations of the analyte with PE passive sampling devices. Measuring log Kpew for super hydrophobic organic chemicals (HOCs) have been proven extremely difficult. The present study developed a large volume model for measuring log Kpew of super HOCs, i.e., novel halogenated flame retardants (NHFRs). Results showed that the measured log Kpew values of selected PAHs and PCBs obtained by the large volume model were in line with those from the co-solvent model and the literature data within less 0.3 log units of difference, while those of NHFRs (6.27–7.34) except for hexachlorocyclopentadienyldibromocyclooctane (HCDBCO) and Decabromodiphenyl ethane (DBDPE) were significantly lower than those (6.51–8.89) from the co-solvent model. A curvilinear relationship was observed between log Kpew and log Kow of all target compounds, with the turning point at log Kow = ∼8.0 in the large volume model, but that was not found for the co-solvent model. These can be attributed to the large molecular volumes (> 450 A3) for NHFRs, which require high Gibbs free energy to penetrate into the inside structures of LDPE in the large volume model. However, the solvent swelling effects in the co-solvent model needs to be investigated. Therefore, the large volume model is robust to determine the Kpew values of super HOCs for facilitating the application of aquatic passive sampling techniques.
- Subjects :
- Analyte
Environmental Engineering
Materials science
Health, Toxicology and Mutagenesis
0208 environmental biotechnology
Analytical chemistry
02 engineering and technology
010501 environmental sciences
01 natural sciences
chemistry.chemical_compound
symbols.namesake
medicine
Environmental Chemistry
Flame Retardants
0105 earth and related environmental sciences
Public Health, Environmental and Occupational Health
Water
General Medicine
General Chemistry
Polyethylene
Pollution
020801 environmental engineering
Gibbs free energy
Solvent
Partition coefficient
Low-density polyethylene
Volume (thermodynamics)
chemistry
Solvents
symbols
Swelling
medicine.symptom
Water Pollutants, Chemical
Environmental Monitoring
Subjects
Details
- ISSN :
- 00456535
- Volume :
- 277
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....e410e43ac6631926a8f0bceef820e5e9