Reversed-phase separation of estuarine interstitial water fractions and the consequences of C{sub 18} retention of organic matter

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Environmental Toxicology and Chemistry

DOI:https://doi.org/10.1897/1552-8618(1995)14[1261:RSOEIW]2.0.CO;2· OSTI ID:94310

Ozretich, R J; Smith, L M; Roberts, R A ^[1]

---

1. Environmental Protection Agency, Newport, OR (United States)

Data are presented on the application of the reversed-phase separation technique for the determination of dissolved organic compounds in estuarine interstitial water. Thirty-seven neutral, nonpolar organic compounds were equilibrated with interstitial water, extracted by emulsion-free gentle liquid-liquid extraction, and quantified using surrogate internal standards. The extraction and quantitation procedures were insensitive to dissolved organic carbon concentration (DOC, 1 to 55 mg C/L). Gross dissolved organic carbon retention by the C{sub 18} matrix (7 {+-} 2%) was similar to the range reported for fresh water; significant regressions of apparent, DOC-normalized, partition coefficients (K{prime}{sub doc}) versus compound solubility and octanol/water partition coefficients (K{sub ow}) were determined. An inverse relationship between K{prime}{sub doc} and DOC concentrations, similar to that reported in fresh water, was found, but was reduced or eliminated for many compounds by accounting for the retained bound compound in the calculation of K{prime}{sub doc}; failure to account for C{sub 18} retention of DOM in determining freely dissolved concentrations of high K{sub ow} organic compounds could result in overestimates of this fraction. Partition coefficients of selected compounds between Aldrich humic acid and distilled water were similar to those found in other studies using radiolabeled compounds.

• Sponsoring Organization: USDOE
• OSTI ID: 94310
• Journal Information: Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 8 Vol. 14; ISSN 0730-7268; ISSN ETOCDK
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CARBON 18
ESTUARIES
INTERSTITIAL WATER
ORGANIC COMPOUNDS
ORGANIC MATTER
POLYCHLORINATED BIPHENYLS
POLYCYCLIC AROMATIC HYDROCARBONS
RETENTION
SEPARATION PROCESSES
WATER POLLUTION