| 摘要: |
| 研究了8种土壤粘粒对脲酶的吸附量,以及不同pH,温度和Zn(Ⅱ)、As(Ⅴ)、Hg(Ⅱ)质量浓度对脲酶吸附量的影响。结果表明, 8种土壤粘粒对脲酶均有吸附,但吸附数量不尽相同。非最适pH时,脲酶吸附量在弱碱性介质中的下降率大于弱酸性介质;温度升高,脲酶吸附量下降,且去有机质土壤粘粒的下降率大于原样土壤粘粒;Zn(Ⅱ)、As(Ⅴ)、Hg(Ⅱ)抑制相同比率的脲酶吸附量时,所需3种离子的质量浓度为As(Ⅴ)>Zn(Ⅱ)>Hg(Ⅱ),表现为Hg(Ⅱ)的抑制作用最强。 |
| 关键词: 土壤粘粒 脲酶吸附量 影响因子 |
| DOI： |
| 分类号:S154.2 |
| 基金项目:国家自然科学基金资助项目(39370148) |
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| Studies on the Factors Which Affect Urease Adsorption Amount on Soil Clay |
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| Abstract: |
| The urease adsorption amount on eight kinds of soil clay and that under
different pH and temperature and Zn(Ⅱ), As(Ⅴ),Hg(Ⅱ) concentration conditions
were studied.The results indicated thaturease adsorption amount on eight kinds of soil
clay was different. The urease adsorption amount decreased if pH didnt equal. The reduction rate under the weak alkaline medium was greater than that under the weak
acidic medium.The results that temperature affected urease adsorption amount were as
follows: the higher the temperature, the less the urease adsorption amount. The urease
adsorption amounton soil clay from which organic matter was removed was greater than
that on the original soil clay.Zn(Ⅱ),As(Ⅴ) and Hg(Ⅱ) could reduce the urease adsorption amount on soil clay. If the same urease adsorption amount was reduced, the order of the three elements concentration was:As(Ⅴ)>Zn(Ⅱ)>Hg(Ⅱ),which indicated
thatHg(Ⅱ) could restrain urease the greatest in the three elements. |
| Key words: soil clay,urease adsorption amount,affecting factors |
