几种胡敏酸还原容量的表征与比较
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

国家自然科学基金项目(40971147/D010503)、西南大学研究生科技创新基金项目(ky2010013)和中央高校基本科研业务费专项资金项目(XDJK2009C053)


Characterization of and comparison between reduction capacities of different humic acids
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    还原容量(RC)是衡量胡敏酸(HA)还原特性的重要指标。采用饱和H2振荡法和土壤溶液法对HA分别进行化学和微生物预处理,分别以硝酸铁(Fe(NO3)3)、柠檬酸铁(FeCit)作电子受体,测定了三种HA(上海巨枫SH,天津光复TJ,缙云山JY)的本底还原容量(NRC),化学还原容量(CRC),微生物还原容量(MRC)。对不同电子受体条件下、不同初始状态和不同种类的胡敏酸的RC进行比较。结果表明:三种HA中,以缙云山土壤提取的胡敏酸RC值最高,还原容量最大,分别为20.21±0.26mmolc mol-1C (NRC)、26.02±1.12mmolc mol-1C (CRC)和29.29±1.56mmolc mol-1C (MRC)。两种电子受体中,采用Fe(NO3)3得到的RC明显高于在FeCit条件下。另外,溶液态HA的RC明显高于固态。由此证明胡敏酸还原容量是一个相对量;其容量大小不仅和自身结构、性质有关,也受到HA初始形态和不同电子受体的影响。对比三个还原容量指标发现CRC和MRC显著大于NRC,而CRC和MRC之间无明确大小关系,因此用CRC来表征HA被微生物还原后的还原容量(MRC)还需作进一步验证。

    Abstract:

    As an important parameter, Reduction capacity (RC) is recognized for evaluating redox characteristics of humic acids (HA) in environment. In this study, three HAs (tagged as SH, TJ and JY respectively) from different sources were selected and pretreated through methods of saturated hydrogen oscillation and soil solution incubation respectively for determining chemical reduction capacity (CRC) and microbial reduction capacity (MRC) by reduction of two electron acceptors including ferric nitrate (Fe(NO3)3) and ferric citrate(FeCit), in comparison with native reducing capacity (NRC) obtained through the same measurement method based on HA samples without any pretreatments. The results suggested that HA extracted from local humus layer of soil in JinYun Mountain had the greatest RC among three humic acids, which showed the highest RC values of 20.21±0.26 mmolcmol-1C(NRC), 26.02±1.12 mmolcmol-1C(CRC) and 29.29±1.56 mmolc mol-1C(MRC), respectively. Meanwhile, Of the two electron acceptors, Fe(NO3)3 induced much higher RC than FeCit. In addition, HA in solution status showed higher RC than in solid status. All the above findings demonstrate that reduction capacity (RC) of HA is a variable parameter, which is closely related to the structure and properties of the HA per se and also affected by its initial status (e.g. solution or solid) and electron acceptors. Comparison between the RC indexes of the HAs shows that CRC and MRC were evidently higher than NRC, however no significant difference in magnitude was observed between CRC and MRC. However, whether it is feasible to use CRC to characterize MRC needs further study for validation.

    参考文献
    相似文献
    引证文献
引用本文

江韬,魏世强,李雪梅,李梦婕,彭国栋,刘双营,罗畅.几种胡敏酸还原容量的表征与比较[J].土壤学报,2012,49(5):901-908. DOI:10.11766/trxb201108290323 Jiang Tao, Wei Shiqiang, Li Xuemei, Li Mengjie, Peng Guodong, Liu Shuangying, Luo Chang. Characterization of and comparison between reduction capacities of different humic acids[J]. Acta Pedologica Sinica,2012,49(5):901-908.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2011-08-29
  • 最后修改日期:2012-02-14
  • 录用日期:2012-04-01
  • 在线发布日期: 2012-04-23
  • 出版日期: