Feasibility of a simple laboratory approachnext term for determining temperature influence on SPMD–air partition coefficients of selected compounds

• Semipermeable membrane devices (SPMDs) are previous termanext term widely used passive sampling methodology for both waterborne and airborne hydrophobic organic contaminants. The exchange kinetics and partition coefficients of an analyte in previous termanext term SPMD are mediated by its physicochemical properties and certain environmental conditions. Controlled previous termlaboratorynext term experiments are used for determining the SPMD–air (Ksa's) partition coefficients and the exchange kinetics of organic vapors. This study focused on determining previous terma simple approachnext term for measuring equilibrium Ksa's for naphthalene (Naph), o-chlorophenol (o-CPh) and p-dichlorobenzene (p-DCB) over previous termanext term wide range of temperatures. SPMDs were exposed to test chemical vapors in small, gas-tight chambers at four different temperatures (−16, −4, 22 and 40 °C). The exposure times ranged from 6 h to 28 d depending on test temperature. Ksa's or non-equilibrium concentrations in SPMDs were determined for all compounds, temperatures and exposure periods with the exception of Naph, which could not be quantified in SPMDs until 4 weeks at the −16 °C temperature. To perform this study the assumption of constant and saturated atmospheric concentrations in test chambers was made. It could influence the results, which suggest that flow through experimental system and performance reference compounds should be used for SPMD calibration.

Nyckelord

Temperature

SPMDs; Partition coefficients

Naphthalene

o-chlorophenol

p-dichlorobenzene

Publikations- och innehållstyp

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art (ämneskategori)