DETERMINATION OF MOLECULAR-WEIGHT DISTRIBUTIONS OF FULVIC AND HUMIC ACIDS USING FLOW FIELD-FLOW FRACTIONATION
DETERMINATION OF MOLECULAR-WEIGHT DISTRIBUTIONS OF FULVIC AND HUMIC ACIDS USING FLOW FIELD-FLOW FRACTIONATION
复制标题
DOI：
10.1021/es00157a010
复制
发表时间：
1987-03-01
影响因子：
11.4
通讯作者：
GIDDINGS, JC
中科院分区：
文献类型：
--
作者：
BECKETT, R;JUE, Z;GIDDINGS, JC
流场流分级（流FFF）已被用来确定从各种淡水和陆地环境中提取的富里酸和腐殖酸的分子量分布。数均分子量和重均分子量均已估算。出现了一些明显的趋势。因此，富里酸比胡敏酸小，不同来源的胡敏酸的粒度和多分散性的增加顺序为水生<土壤<泥炭沼泽<褐煤。此外，两种高度着色的天然沃茨通过直接进样运行，而不需要任何样品预处理。它们的分子量分布与土壤腐殖酸的分子量分布最接近。流动FFF的新技术是能够产生详细的分子量信息，似乎有相当大的潜力，调查这些重要而复杂的化合物。
Flow field-flow fractionation (flow FFF) has been used to determine molecular weight distributions of extracted fulvic and humic acids from a variety of freshwater and terrestrial environments. Both number and weight molecular weight averages have been estimated. Some pronounced trends have emerged. Thus, fulvic acids are smaller than humic acids, and the order of increasing size and polydispersity of humates from different sources was aquatic < soil < peat bog < lignite coal. In addition, two highly colored natural waters were run by direct injection without the need for any sample pretreatment. Their molecular weight distributions were closest to that of the soil humate. The new technique of flow FFF is capable of yielding detailed molecular weight information and appears to have considerable potential for investigating these important yet complex compounds.