Cloud-point preconcentration of fulvic and humic acids.
The cloud-point extraction technique was used for preconcentration of fulvic and humic acids. The effect of the acidity of solution, the equilibration temperature and time, the amount of added surfactant (Triton X-100) and the time of centrifugation on the recovery were examined. The recoveries of fulvic and humic acids achieved under optimised conditions were 82% and 96%, respectively.
Revia
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Department of Chemistry, Tbilisi State University, Chavchavadze Ave. 3, Tbilisi, 380028, Georgia.
Makharadze
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GA