Peuravuori J, Ingman P, Pihlaja K, Koivikko R
Department of Chemistry, Laboratory of Physical Chemistry, University of Turku, FIN-20014, Turku, Finland.
Talanta. 2001 Oct 31;55(4):733-42. doi: 10.1016/s0039-9140(01)00478-7.
Aquatic humic solutes were separated in parallel by the non-ionic macroporous DAX-8 and XAD-8 resins from four different fresh water sources. On average, the sorptive power of the DAX-8 resin does not differ systematically from that of the XAD-8 resin. The DAX-8 resin seems to have more precise column characteristics compared with the XAD-8 resin. There was no significant difference between the major elemental compositions of the parallel humic-solute bulks obtained by these two resins. According to the (13)C NMR spectroscopy the content and quality of aliphatic carbons, especially those representing terminal methyl groups or methylene carbons, were the most systematic and powerful discriminating factors between the humic extracts obtained by these two resins. Generally speaking the DAX-8 and XAD-8 resins seem to isolate humic-solute bulks almost equally, although the content of aliphatics is slightly greater for the former, producing mixtures with similar structural compositions for general purposes. The structural composition and quantity of the humic-solute mixture isolable with a weakly basic DEAE-cellulose anion exchange resin differs partially from any humic fraction obtained by non-ionic sorbing solids. The environmental impact was also visible on the quality of the structural fine-chemistry of the different humic isolates obtained both by the DAX-8 and XAD-8 resins.
使用非离子型大孔树脂DAX - 8和XAD - 8从四种不同的淡水水源中并行分离出水相腐殖质溶质。平均而言，DAX - 8树脂的吸附能力与XAD - 8树脂的吸附能力没有系统性差异。与XAD - 8树脂相比，DAX - 8树脂似乎具有更精确的柱特性。这两种树脂所获得的平行腐殖质溶质主体的主要元素组成没有显著差异。根据碳 - 13核磁共振光谱，脂肪族碳的含量和质量，尤其是代表末端甲基或亚甲基碳的那些，是这两种树脂所获得的腐殖质提取物之间最具系统性和最有力的区分因素。一般来说，DAX - 8和XAD - 8树脂似乎几乎能同等程度地分离腐殖质溶质主体，尽管前者的脂肪族含量略高，可产生用于一般目的结构组成相似的混合物。用弱碱性DEAE - 纤维素阴离子交换树脂可分离出的腐殖质溶质混合物的结构组成和数量与通过非离子吸附固体获得的任何腐殖质组分部分不同。DAX - 8和XAD - 8树脂所获得的不同腐殖质分离物的结构精细化学质量也受到环境影响。
