Extraction of chromophoric humic substances from seawater
Extraction of chromophoric humic substances from seawater
复制标题
从海水中提取发色腐殖质
DOI：
10.1016/0304-4203(90)90002-t
复制
发表时间：
1990
期刊：
影响因子：
3
通讯作者：
R. Zika
中科院分区：
文献类型：
--
作者：
J. Amador;P. Milne;C. Moore;R. Zika
采用疏水固相萃取、超滤和疏水大孔吸附树脂（XAD-2）从海水中提取发色腐殖物质。采用4个指标评价提取效率：（1）紫外-可见吸收，（2）溶解有机物荧光，（3）光产生H2 O2的能力，和（4）总有机碳的保留。固相介质的萃取效率顺序为C18> C8>环己基（CH）>苯基（PH）=C2。从海水中去除腐殖物质的程度下降70和40%之间的体积提取和水源不同。使用我们的标准，提取腐殖物质与C18固相之间的22%和84%，更有效地比XAD-2。通过超滤浓缩腐殖物质是更有效的膜的分子量截止值为500比5000。C18固相萃取法提取腐殖物质的效果与超滤法相当。用C18固相萃取和超滤提取的腐殖物质重建的海水具有原始水样的90和101%之间的属性。结果表明，C18固相萃取法是提取海水中腐殖酸类物质的最佳方法。这个程序的放大版本已被用于从大量（1001）的沿海和公海水域的发色腐殖物质的提取。
Chromophoric humic substances were extracted from seawater using hydrophobic solid-phase extraction, ultrafiltration, and a hydrophobic macroreticular resin (XAD-2). Four criteria were used to evaluate the efficiency of extraction: (1) UV-visible absorbance, (2) dissolved organic matter fluorescence, (3) capacity for photoproduction of H2O2, and (4) retention of total organic carbon. Extraction efficiencies for solid-phase media followed the order C18> C8> cyclohexyl (CH) > phenyl (PH)=C2. The extent of removal of humic substances from seawater decreased between 70 and 40% with volume extracted and varied with the source of water. Using our criteria, extraction of humic substances with C18solid phase was between 22 and 84% more effective than with XAD-2. Concentration of humic substances by ultrafiltration was more efficient with membranes of molecular weight cut-off values of 500 than 5000. C18solid-phase extraction of humic substances was as effective as ultrafiltration. Seawater reconstituted with humic substances extracted by C18solid-phase extraction and by ultrafiltration had properties that were between 90 and 101% of those of the original water samples. Our results indicate that extraction of humic substances from seawater is most conveniently achieved by using C18solid-phase extraction. A scaled-up version of this procedure has been used for the extraction of chromophoric humic substances from large volumes (1001) of coastal and open-ocean water.