Quantitative desorption of humic substances from Amberlite XAD resins with an alkaline solution of sodium dodecyl sulfate
✍ Scribed by Mohammad-Hussein Sorouradin; Masataka Hiraide; Young-Sang Kim; Hiroshi Kawaguchi
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 382 KB
- Volume
- 281
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
Microgram quantities of hunk or fulvic acid are quantitatively adsorbed on a small amount (ca. 1 ml) of pulverized Amberlite XAD-2 and XAD-8 resins. A sodium hydroxide solution, aqueous ammonia, or a mixture of methanol and aqueous ammonia leads to very low desorption recoveries of the bumic substance, however. Pm-saturation of strong adsorption sites of the resin witb some surfactants increases the desorption recovery, but it is not quantitative. The desorption efficiency is tremendously improved with the aid of an anionic surfactant. Hunk and fulvic acids retained on the XAD resins are%ompletely desorbed with 280 mg of sodium dodecyl sulfate in 10 ml of 0.1 M sodium hydroxide solution. The surfactant does not interfere with the spectrophotometric determination of hunk substances. Further, it can be removed from the solution as a precipitate by increasing the alkalinity to 0.25 M.