Natural organic-matter interactions with Cu(II) in ground water

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5622251

Odem, Jr, W I

The influence of dissolved natural organic matter (NOM) on the transport of Cu(II) in saturated media was investigated in controlled batch and column experiments. Six sources of natural organic matter were chosen to represent different environments and different humic fractions. SiO{sub 2} and {alpha}-Al{sub 2}O{sub 3} comprised the mineral surfaces with which the NOM and Cu(II) interacted. The experiments were conducted at a constant ionic strength and buffer concentration and at pH 6.2 and pH 7.5. Equilibrium Cu(II) concentrations were monitored with an ion specific electrode and atomic absorption spectrophotometer and NOM was measured as UV absorbance at 254 nm. Adsorbate effect on particle surface charge was evaluated using microelectrophoresis and the effect of molecular weight on NOM breakthrough was determined with ultrafiltration of column influent and effluent. Column studies showed significant variation in NOM breakthrough as a function of source on a mixed bed of SiO{sub 2} and {alpha}-Al{sub 2}O{sub 3}. Humic acid from the Suwannee River showed greater adsorption than the fulvic acid from the same source. The presence on Cu(II) resulted in greater retardation of all the NOM sources than in the Cu(II) free systems. Cu(II) transport was slightly facilitated at pH 6.2 by the Orange County NOM and Biscayne aquifer NOM, while the other NOM sources inhibited Cu(II) movement. At pH 7.5 the Orange County and Biscayne Aquifer sources greatly facilitated the transport of the Cu(II) in a mixed bed column.

• Research Organization: Arizona Univ., Tucson, AZ (United States)
• OSTI ID: 5622251
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ABSORPTION SPECTRA
CHEMISTRY
CONTAMINATION
COPPER
ELEMENTS
ENVIRONMENTAL EFFECTS
ENVIRONMENTAL TRANSPORT
GROUND WATER
HYDROGEN COMPOUNDS
MASS TRANSFER
MATTER
MEASURING INSTRUMENTS
METALS
ORGANIC MATTER
OXYGEN COMPOUNDS
PH VALUE
POLLUTION
SPECTRA
SPECTROPHOTOMETERS
TRANSITION ELEMENTS
WATER
WATER CHEMISTRY
WATER POLLUTION