Quantitative evaluation of XAD-8 and XAD-4 resins used in tandem for removing organic solutes from water

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Environment International; (United States)

DOI:https://doi.org/10.1016/0160-4120(92)90027-2· OSTI ID:6827891

Malcolm, R L ^[1]; MacCarthy, P ^[2]

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1. Geological Survey, Denver, CO (United States)
2. Colorado School of Mines, Golden (United States)

The combined XAD-8 and XAD-4 resin procedure for the isolation of dissolved organic solutes from water was found to isolate 85% or more of the organic solutes from Lake Skjervatjern in Norway. Approximately 65% of the dissolved organic carbon (DOC) was first removed on XAD-8 resin, and then an additional 20% of the DOC was removed on XAD-4 resin. Approximately 15% of the DOC solutes (primarily hydrophilic neutrals) were not sorbed or concentrated by the procedure. Of the 65% of the solutes removed on XAD-8 resin, 40% were fulvic acids, 16% were humic acids, and 9% were hydrophobic neutrals. Approximately 20% of the hydrophilic solutes that pass through the XAD-8 resin were sorbed solutes on the second resin, XAD-4 (i.e., they were hydrophobic relative to the XAD-4 resin). The fraction sorbed on XAD-4 resin was called XAD-4 acids because it represented approximately 85-90% of the hydrophilic XAD-8 acid fraction according to the original XAD-8 fractionation procedure. The recovery of hydrophobic acids (fulvic acids and humic acids) and the hydrophobic neutral fraction from XAD-8 resin was essentially quantitative at 96%, 98%, and 86%, respectively. The recovery of XAD-4 acids from the XAD-4 resin was only about 50%. The exact reason for this moderately low recovery is unknown, but could result from [pi]-[pi] bonding between these organic solutes and the aromatic matrix of XAD-4. The hydrophobic/hydrophilic solute separation on XAD-8 resin for water from background Side A and Side B of the lake was almost identical at 65 and 67%, respectively. This result suggested that both sides of the lake are similar in organic chemical composition even though the DOC variation from side to side is 20%. 12 refs., 5 figs., 3 tabs.

• OSTI ID: 6827891
• Journal Information: Environment International; (United States), Journal Name: Environment International; (United States) Vol. 18:6; ISSN ENVIDV; ISSN 0160-4120
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ACID RAIN
ATMOSPHERIC PRECIPITATIONS
CHEMISTRY
CHROMATOGRAPHY
DATA
EXPERIMENTAL DATA
FULVIC ACIDS
HUMIC ACIDS
INFORMATION
ION EXCHANGE CHROMATOGRAPHY
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
RAIN
RESINS
SEPARATION PROCESSES
SURFACE WATERS
WATER CHEMISTRY
WATER TREATMENT