| 几种胡敏酸还原容量的表征与比较 |
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| 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(4):901-908. |
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| 作者姓名： | 江韬 魏世强 李雪梅 李梦婕 彭国栋 刘双营 罗畅 |
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| 作者单位： | 西南大学资源环境学院环境科学与工程系,西南大学资源环境学院环境科学与工程系,西南大学资源环境学院环境科学与工程系,四川省绵阳市环境监测站,西南大学资源环境学院环境科学与工程系,西南大学资源环境学院环境科学与工程系,西南大学资源环境学院环境科学与工程系 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 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。
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| 关 键 词： | 胡敏酸 腐殖酸 电子受体 还原容量 铁 |
| 收稿时间： | 2011/8/29 0:00:00 |
| 修稿时间： | 2/14/2012 1:26:08 AM |
Characterization of and comparison between reduction capacities of different humic acids |
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| Jiang Tao,Wei Shiqiang,Li Xuemei,Li Mengjie,Peng Guodong,Liu Shuangying and Luo Chang.Characterization of and comparison between reduction capacities of different humic acids[J].Acta Pedologica Sinica,2012,49(4):901-908. |
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| Authors: | Jiang Tao Wei Shiqiang Li Xuemei Li Mengjie Peng Guodong Liu Shuangying and Luo Chang |
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| Affiliation: | College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing, China.,College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing, China.,College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing, China.,Mianyang Environmental Monitoring Station,College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing, China.,College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing, China.,College of Resources and Environment, Department of Environment Science and Engineering, Southwest University, Chongqing, China. |
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| Abstract: | Reduction capacity (RC) is an important parameter for evaluating redox characteristics of humic acids (HA) in environemnt. In this study, HAs from different soils sampled from Jufeng of Shanghai (SH), Guangfu of Tianjin (TJ) and Jinyunshan (JY), separately, were selected and pretreated chemically or biologically using saturated hydrogen oscillation method and soil solution incubation method, respectively, for determination of their native reduction capacity (NRC), chemical reduction capacity (CRC) and microbial reduction capacity (MRC), as affected by different electron acceptors, i.e. ferric nitrate (Fe(NO3)3) and ferric citrate(FeCit), and different initial status, for comparison. Results show that among the three HA samples, JY was the highest in RC values, reaching 20.21?0.26mmolc mol-1C (NRC), 26.02?1.12mmolc mol-1C (CRC) and 29.29?1.56mmolc mol-1C (MRC). Of the two electron acceptors, Fe(NO3)3 induced much higher RC than FeCit. In addition, liguid HA was higher solid HA in RC. All the above findings demonstrate that reduction capacity (RC) of HA is a variable value 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. |
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| Keywords: | humic acid electron acceptor reduction capacity iron |
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