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Jan C.T. Kwak Richard W.P. Nelson Donald S. Gamble 《Geochimica et cosmochimica acta》1977,41(7):993-996
The ultrafiltration of solutions of well characterized samples of fulvic and humic acids or their salts, using two different techniques, show that these materials are retained by commercial ultrafiltration membranes with molecular weight cut-off values far higher than the reported molecular weights of fulvic or humic acid. The lower molecular weight fulvic acid or its Na+ -salt is retained even better than the higher molecular weight Na+-salt of humic acid. Both stirred cell and hollow fiber techniques can be employed to concentrate or desalt solutions of these humic materials, with relatively small solute losses. Very high simple electrolyte backgrounds (above 1 M) lower the performance of a given membrane considerably, moderate concentrations of simple electrolyte do not influence the ultrafiltration efficiency. 相似文献
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Kwak Myeong-Taek Seo Gwang-Ho Cho Yang-Ki Kim Bong-Guk You Sung Hyup Seo Jang-Won 《Ocean Science Journal》2015,50(1):109-117
Ocean Science Journal - Satellite remotely sensed sea surface temperature (SST) was compared with in-situ SST in the seas around the Korean Peninsula from 1984 to 2013. A matchup dataset between... 相似文献