Measuring aqueous solubility in the presence of small cosolvent volume fractions by passive dosing

Hyuck Chul Kwon, Jung-Hwan Kwon

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

A new passive dosing method was developed to determine aqueous solubility of hydrophobic chemicals. In the passive dosing method, chemical crystals were loaded to a polydimethylsiloxane (PDMS) phase to maintain the maximum chemical activity and to prevent direct contact of chemical crystals with the aqueous solution. Eight polycyclic aromatic hydrocarbons (PAHs) were chosen covering their literature aqueous solubility from 0.001 to 30 mg L-1. Values of the aqueous solubility for less hydrophobic PAHs (naphthalene, 2-methylnaphthalene, and fluorene) were measured by an Organization for Economic Co-ordination and Development (OECD)-recommended generator column method and those for more hydrophobic PAHs (anthracene, chrysene, and benzo(a)pyrene) were measured by the passive dosing method. For phenanthrene and pyrene, both methods were used for comparison. The results obtained by the passive dosing method were very close to those obtained by the generator column method. Aqueous solubilities in deionized water for more hydrophobic PAHs obtained using the passive dosing method agreed very well with values reported in the literature, suggesting the utility of the passive dosing method for the determination of aqueous solubility for highly hydrophobic chemicals. Because hydrophobic chemicals are often introduced in aqueous solutions by using a cosolvent, the solubility enhancement for PAHs at low cosolvent volume fractions was also evaluated. Three cosolvents (dimethyl sulfoxide, ethanol, and acetone) were chosen and their volume fractions in water were between 0.2% and 2%. The enhancement of the aqueous solubility could be well explained quantitatively by using a log-linear cosolvency model. The measured values of cosolvency power at the range of volume fraction investigated (σ0.02) correlated very well with log Kow of the PAHs. The combination of the log-linear model and semiempirical relationships between σ0.02 and log Kow would be useful for the prediction of the solubility enhancement of hydrophobic chemicals.

Original languageEnglish
Pages (from-to)12550-12556
Number of pages7
JournalEnvironmental Science and Technology
Volume46
Issue number22
DOIs
Publication statusPublished - 2012 Nov 20
Externally publishedYes

Fingerprint

Solubility
Volume fraction
Polycyclic Aromatic Hydrocarbons
solubility
PAH
pyrene
aqueous solution
Linear Models
crystal
Crystals
measuring
method
Deionized water
Benzo(a)pyrene
chemical method
phenanthrene
Water
Acetone
Dimethyl Sulfoxide
acetone

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Measuring aqueous solubility in the presence of small cosolvent volume fractions by passive dosing. / Kwon, Hyuck Chul; Kwon, Jung-Hwan.

In: Environmental Science and Technology, Vol. 46, No. 22, 20.11.2012, p. 12550-12556.

Research output: Contribution to journalArticle

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