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Characterization of Soil Humin by Acid Hydrolysis.

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Title: Characterization of Soil Humin by Acid Hydrolysis.
Authors: Li Yunfeng, Xu Jianmin, Wang Shijie, Yuan Keneng
Source: Chinese Journal of Geochemistry. 1999, Vol. 18 Issue 4, p333. 7p.
Subjects: Humins, Soil testing, Hydrolysis
Abstract: Studies were conducted to characterize soil humin by acid hydrolysis. Two humin samples collected from two different types of soil, namely chernozem and laterite, which are widespread over a vast area from the north to south of China, were hydrolyzed under reflux with 0.5M H[sub 2]SO[sub 4] or 3M H[sub 2]SO[sub 4] for 4 h. The results showed that 25%-29% of organic carbon and 46%-54% of organic nitrogen could be hydrolyzed by 0.5M H[sub 2]SO[sub 4]; 36%-40% of organic carbon and 93% - 97% of organic nitrogen hydro1yzed by 3M H[sub 2]SO[sub 4]. The C/N ratio in hydrolyzed organic matter is lower than that in soil humin and that in organic matter hydrolyzed by 3M H[sub 2]SO[sub 4] is lower than in organic matter hydrolyzed by 0.5M H[sub 2]SO[sub 4]. The proportion of nitrogen hydrolyzed from humin is markedly larger than that from the original soil and also markedly larger than that from humic acid fraction. Only 3%-7% of nitrogen in humin exists in a relatively stable form, which is not easy to hydrolyze. There is little nitrogen that occurs in the form of heterocyclic rings in humin. Incubation experiments showed that the newly formed organic matter can be hydrolyzed more easily. [ABSTRACT FROM AUTHOR]
Copyright of Chinese Journal of Geochemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 4977468
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  Data: Characterization of Soil Humin by Acid Hydrolysis.
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  Data: <searchLink fieldCode="AR" term="%22Li+Yunfeng%22">Li Yunfeng</searchLink><br /><searchLink fieldCode="AR" term="%22Xu+Jianmin%22">Xu Jianmin</searchLink><br /><searchLink fieldCode="AR" term="%22Wang+Shijie%22">Wang Shijie</searchLink><br /><searchLink fieldCode="AR" term="%22Yuan+Keneng%22">Yuan Keneng</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Chinese+Journal+of+Geochemistry%22">Chinese Journal of Geochemistry</searchLink>. 1999, Vol. 18 Issue 4, p333. 7p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Humins%22">Humins</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+testing%22">Soil testing</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrolysis%22">Hydrolysis</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Studies were conducted to characterize soil humin by acid hydrolysis. Two humin samples collected from two different types of soil, namely chernozem and laterite, which are widespread over a vast area from the north to south of China, were hydrolyzed under reflux with 0.5M H[sub 2]SO[sub 4] or 3M H[sub 2]SO[sub 4] for 4 h. The results showed that 25%-29% of organic carbon and 46%-54% of organic nitrogen could be hydrolyzed by 0.5M H[sub 2]SO[sub 4]; 36%-40% of organic carbon and 93% - 97% of organic nitrogen hydro1yzed by 3M H[sub 2]SO[sub 4]. The C/N ratio in hydrolyzed organic matter is lower than that in soil humin and that in organic matter hydrolyzed by 3M H[sub 2]SO[sub 4] is lower than in organic matter hydrolyzed by 0.5M H[sub 2]SO[sub 4]. The proportion of nitrogen hydrolyzed from humin is markedly larger than that from the original soil and also markedly larger than that from humic acid fraction. Only 3%-7% of nitrogen in humin exists in a relatively stable form, which is not easy to hydrolyze. There is little nitrogen that occurs in the form of heterocyclic rings in humin. Incubation experiments showed that the newly formed organic matter can be hydrolyzed more easily. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Chinese Journal of Geochemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/BF03052908
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 7
        StartPage: 333
    Subjects:
      – SubjectFull: Humins
        Type: general
      – SubjectFull: Soil testing
        Type: general
      – SubjectFull: Hydrolysis
        Type: general
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      – TitleFull: Characterization of Soil Humin by Acid Hydrolysis.
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            NameFull: Li Yunfeng
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            NameFull: Xu Jianmin
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            NameFull: Wang Shijie
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            NameFull: Yuan Keneng
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            – D: 01
              M: 12
              Text: 1999
              Type: published
              Y: 1999
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              Value: 10009426
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              Value: 18
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              Value: 4
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            – TitleFull: Chinese Journal of Geochemistry
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