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Direct Measurements of Polyurethane Foam (PUF) ‒ Air Partitioning Coefficients for Chemicals of Emerging Concern Capable of Equilibrating in PUF Disk Samplers

Direct Measurements of Polyurethane Foam (PUF) ‒ Air Partitioning Coefficients for Chemicals of Emerging Concern Capable of Equilibrating in PUF Disk Samplers

Amandeep Saini, Jenna Clarke, Tom Harner

Chemosphere. 2019 Nov;234:925-930.

PMID: 31519101

Abstract:

Organophosphate esters (OPEs), novel flame retardants (NFRs) and organochlorine pesticides (OCPs) are volatile to semi-volatile chemicals and therefore susceptible to approach equilibrium during typical deployments of polyurethane foam (PUF) disk passive air samplers. A generator column approach was used to measure the PUF-air partitioning coefficient (KPUF-air) for these targeted chemicals. KPUF-air values are required for these chemicals to estimate sampled equivalent air volumes, which vary substantially with temperature. Log KPUF-air measurements were made at temperatures ranging from +6 to +35 °C and resulting values ranged from 5.14 to 7.77. Enthalpies of phase change for PUF to air (ΔHPUF-air, kJ/mol) ranged from 51.3 to 98.9. Two relationships of log KPUF-air versus log Koctanol-air (KOA) were derived, grouping OPEs and NFRs separately. The relationship for NFRs was in fair agreement (within about 0.6 log units) to a long-standing relationship by Shoeib and Harner (since 2002) for polychlorinated biphenyls (PCBs). However, the estimated values using Shoeib-Harner relationship substantially underestimates KPUF-air for the OPEs than directly measured values (by about an order of magnitude). These findings highlight the importance of the direct measurements of KPUF-air for emerging classes of chemicals whose concentrations are at risk of equilibrating in PUF disk samplers.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR42119	Semivolatiles on PUF			Price
IAR42121	Pesticides on PUF			Price

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