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Polarity based fractionation of fulvic acids

机译：基于极性的黄腐酸分馏

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摘要

Fulvic acids from the soil of Peking University (PF) and a Nordic river (NF) were separated into well defined sub-fractions using sequential elution techniques based on eluent polarity. The chemical properties of the fractions including: PF1 and NF1 (eluted by 0.01 M HC1), PF2 and NF2 (eluted by 0.01 M HC1 + 20% methanol), PF3 and NF3 (eluted by 0.01 M HC1 + 40% methanol), and PF4 and NF4 (eluted by 100% methanol), were characterized using UV-Visible spectroscopy, elemental analysis and ~(13)C NMR. The results showed that the UV absorptions of the elution peaks at 280 nm (A280) increased from PF2 to PF4 and NF2 to NF4. No elution peaks were observed for PF1 and NF1. The carbon contents increased from 43.34% to 51.90% and 43.06% to 53.26% while the oxygen contents decreased from 46.39% to 36.76% and 49.76% to 40.03% for PF1-PF4 and NF1-NF4, respectively. As a polarity indicator, the (O + N)/C ratio for PF1-PF4 and NF1-NF4 decreased from 0.88 to 0.62 and 0.89 to 0.58, respectively. The aromatic carbon content increased from PF1 to PF4 and NF1 to NF4, suggesting an increase of the hydrophobicity of these fractions. The polarity was positively related to the ratio of UV absorption at 250 nm and 365 nm (E2/E3), and negatively related to the aromaticity. A high positive relationship between the aromaticity and E2/E3 of fulvic acid fractions was also obtained. The use of an eluent with a decreasing polarity allowed to providing simpler fractions of soil and aquatic fulvic acids.
机译：使用基于洗脱液极性的顺序洗脱技术，将北京大学（PF）和北欧河流（NF）的土壤中的富勒酸分为明确定义的亚级。馏分的化学性质包括：PF1和NF1（用0.01 M HCl洗脱），PF2和NF2（用0.01 M HC1 + 20％甲醇洗脱），PF3和NF3（用0.01 M HC1 + 40％甲醇洗脱）和PF4和NF4（用100％甲醇洗脱）使用紫外可见光谱，元素分析和〜（13）C NMR进行表征。结果表明，在280 nm（A280）处洗脱峰的UV吸收从PF2增加到PF4，从NF2增加到NF4。没有观察到PF1和NF1的洗脱峰。 PF1-PF4和NF1-NF4的碳含量分别从43.34％增至51.90％和43.06％至53.26％，而氧含量分别从46.39％增至36.76％和49.76％至40.03％。作为极性指示剂，PF1-PF4和NF1-NF4的（O + N）/ C比分别从0.88降低到0.62和0.89降低到0.58。芳族碳含量从PF1增加到PF4，从NF1增加到NF4，表明这些馏分的疏水性增加。极性与250 nm和365 nm处的紫外线吸收率（E2 / E3）正相关，与芳香性负相关。还获得了富勒酸级分的芳香性与E2 / E3之间的高度正相关。使用极性递减的洗脱液可以提供更简单的土壤和水产富里酸。

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  • 来源
    《Chemosphere》 |2009年第10期|1419-1426|共8页
  • 作者

    Aimin Li; Jundong Hu; Wenhui Li; Wei Zhang; Xuejun Wang;

  • 作者单位

    MOE Laboratory of Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;

    MOE Laboratory of Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;

    MOE Laboratory of Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;

    MOE Laboratory of Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;

    MOE Laboratory of Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fractions; gradient elution; HCI-methanol solutions; hydrophobicity;

    机译：分数梯度洗脱HCl-甲醇溶液;疏水性;

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