Posted on 08/03/2023 in Fire Safety 2023
Organo-phosphates half-life 2 – 6 weeks in coastal sediment

Lab incubation trials (in the dark) used coastal sediment and sea water collected from the Mediterranean (near the outlet of Marseille’s sewage works) spiked with seven organo-phosphorus esters (list below) to c. 180 ng/g.dw for each of the OPEs. Ambient levels of the OPEs in the sediment before spiking were 1 – 85 ng/g.dw. For the different OPEs, half-lives varied from 3 to 11 weeks in abiotic conditions (sterilised at 120°C) and 2 to 6 weeks in biotic conditions. The OPEs slowest to degrade were TEHP and EHDPP.

OPEs tested: TiBP: tri-iso-butyl phosphate (CAS: 126-71-6)
TnBP: tri-n-butyl phosphate (CAS: 126-73-8)
TCEP: tris-(2-chloroethyl) phosphate (CAS: 115-96-8)
TCPP: tris-(2-chloro, 1-methylethyl) phosphate (CAS: 13674-84-5)
TPhP: triphenyl phosphate – (CAS: 115-86-6)
EHDP: 2- ethylhexyl-diphenyl phosphate (CAS: 1241–94-7)
TEHP; tris(2-ethylhexyl) phosphate (CAS: 78-42-2)

“Effective degradation of organophosphate ester flame retardants and plasticizers in coastal sediments under high urban pressure”, J. Castro‑Jiménez et al., Nature Scientific Reports (2022) 12:20228

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