| Abstract: | 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 ??-?? 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%. |
| Genre: | Article |
| ProdID: | 70016824 |
| Citation Author: | Malcolm, R. L.; MacCarthy, P. |
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| Citation End Page: | 607 |
| Citation Issue: | 6 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environment International |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Quantitative evaluation of XAD-8 and XAD-4 resins used in tandem for removing organic solutes from water; 1992; Article; Journal; Environment International; Malcolm, R. L.; MacCarthy, P. |
| Citation Start Page: | 597 |
| Citation Volume: | 18 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | Quantitative evaluation of XAD-8 and XAD-4 resins used in tandem for removing organic solutes from water; 1992; Article; Journal; Environment International; Malcolm, R. L.; MacCarthy, P. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/0160-4120(92)90027-2 |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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