FULVIC AND HUMIC ACIDS ISOLATED FROM GROUNDWATER - COMPOSITIONAL CHARACTERISTICS AND CATION BINDING

被引:38
作者
ALBERTS, JJ
FILIP, Z
HERTKORN, N
机构
[1] UNIV GEORGIA, INST MARINE, SAPELO ISL, GA 31327 USA
[2] BUNDESGESUNDHEITSAMT, INST WASSER BODEN & LUFTHYG, W-6070 LANGEN, GERMANY
[3] GSF, INST OKOL CHEM, W-8050 ATTACHING, GERMANY
关键词
D O I
10.1016/0169-7722(92)90022-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Samples of humic substances were obtained from a waterworks at Fuhrberg, Germany. The material had a bimodal molecular size distribution with approximately 40% of the total carbon in the 50,000-100,000-D (nominal molecular weight, NMW, in daltons) size fraction and approximately 50% of the carbon in the < 10,000-D (NMW) size fraction. The fulvic and humic acids isolated from the bulk humic substances were low in nitrogen content and had low H/C atomic ratios. Furthermore, the fulvic and humic acids had very similar elemental, spectral and copper binding characteristics. Over 70% of the carbon in both the fulvic and humic acids was present in aromatic or aliphatic groups, with C-13 NMR analyses indicating approximately even distribution among the two types. Competitive elemental binding studies indicated that Ca2+, Mg2+, Al3+ and Fe3+ do not effectively compete for copper binding sites on these compounds. In humic acids, these cations are predominantly bond by carboxylic groups.
引用
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页码:317 / 330
页数:14
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