Determination of temperature dependent Henry's law constants of polychlorinated naphthalenes: Application to air-sea exchange in Izmir Bay, Turkey

ODABAŞI M., Adali M.

ATMOSPHERIC ENVIRONMENT, cilt.147, ss.200-208, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 147
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.atmosenv.2016.10.009
  • Dergi Adı: ATMOSPHERIC ENVIRONMENT
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.200-208
  • Anahtar Kelimeler: PCNs, Henry's law, Inert gas stripping, Air-water exchange, POLYCYCLIC AROMATIC-HYDROCARBONS, WATER EXCHANGE, ORGANOCHLORINE PESTICIDES, PARTITION-COEFFICIENTS, CHESAPEAKE BAY, GAS-EXCHANGE, COASTAL SITE, GREAT-LAKES, BIPHENYLS, CONGENERS
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

The Henry's law constant (H) is a crucial variable to investigate the air-water exchange of persistent organic pollutants. H values for 32 polychlorinated naphthalene (PCN) congeners were measured using an inert gas-stripping technique at five temperatures ranging between 5 and 35 degrees C. H values in deionized water (at 25 degrees C) varied between 0.28 +/- 0.08 Pa m(3) mol(-1) (PCN-73) and 18.01 +/- 0.69 Pa m(3) mol(-1) (PCN-42). The agreement between the measured and estimated H values from the octanol-water and octanol-air partition coefficients was good (measured/estimated ratio = 1.00 +/- 0.41, average +/- SD). The calculated phase change enthalpies (Delta H-H) were within the interval previously determined for other several semi volatile organic compounds (42.0-106.4 kJ mol(-1)). Measured H values, paired atmospheric and aqueous concentrations and meteorological variables were also used to reveal the level and direction of air-sea exchange fluxes of PCNs at the coast of Izmir Bay, Turkey. The net PCN air-sea exchange flux varied from-0.55 (volatilization, PCN-24/14) to 2.05 (deposition, PCN-23) ng m(-2) day(-1). PCN-19, PCN-24/14, PCN-42, and PCN-33/34/37 were mainly volatilized from seawater while the remaining congeners were mainly deposited. The overall number of the cases showing deposition was higher (67.9%) compared to volatilization (21.4%) and near equilibrium (10.7%). (C) 2016 Elsevier Ltd. All rights reserved.