Isolation of nonvolatile, organic solutes from natural waters by zeotrophic distillation of water from N,N-dimethylformamide

Journal Article · Fri May 01 00:00:00 EDT 1987 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00136a013· OSTI ID:6451243

Leenheer, J A; Brown, P A; Stiles, E A

Nonvolatile, organic solutes that comprise the dissolved organic carbon (DOC) in saline waters were isolated by removal of the water by distillation from a N,N-dimethylformamide-formic acid-acetonitrile mixture. Salts isolated with the DOC were removed by crystallization of sodium chloride and sodium sulfate from the solvent mixture, removal of silicic acid by acidification and precipitation, removal of boric acid by methylation and volatilization, and removal of phosphate by zinc acetate precipitation. Chemical alteration of the organic solutes was minimized during evaporative concentration steps by careful control of acid concentrations in the solvent mixture and was minimized during drying by conversion of the samples to pyridinium and sodium salts. Recoveries of various hydrophilic organic standards from aqueous salt solutions and recoveries of natural organic solutes from various water samples varied from 60 to 100%. Losses of organic solutes during the isolation procedure were nonselective and related to the number of salt- and precipitate-washing cycles in the procedure.

• Research Organization: Geological Survey, Lakewood, CO
• OSTI ID: 6451243
• Journal Information: Anal. Chem.; (United States), Vol. 59:9
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
AMIDES
SOLVENT PROPERTIES
ORGANIC COMPOUNDS
REMOVAL
SEAWATER
DISTILLATION
AQUEOUS SOLUTIONS
EVAPORATION
EXPERIMENTAL DATA
ORGANIC SOLVENTS
SALTS
SOLUTES
DATA
DISPERSIONS
HYDROGEN COMPOUNDS
INFORMATION
MIXTURES
NUMERICAL DATA
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SEPARATION PROCESSES
SOLUTIONS
SOLVENTS
WATER
400105* - Separation Procedures
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)