| 碳酸酐酶对碳酸盐岩溶解的催化作用及其在大气CO2沉降中的意义 |
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| 关键词:carbonic anhydrase CO2 conversion carbonate rock dissolution chemical weathering atmospheric CO2 precipitation |
| 基金项目:国家自然科学基金项目(编号:40073026);国土资源部“百人计划”项目(编号9806);广西自然科学基金项目(编号:9824021;德国不莱梅大学博士后研究基金项目;科技部社会公益研究专项资金项目(编号:164) |
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| The Role of Carbonic Anhydrase as an Activator in Carbonate Rock Dissolution and Its Significance in Atmospheric CO2 Precipitation |
| The conversion of CO 2 into H + and HCO - 3 is a relatively slow reaction. Hence, its kinetics may determine the rate of carbonate rock dissolution. Carbonic anhydrase (CA), which is widespread in nature, was used to catalyze the CO 2 conversion process in dissolution experiments of limestone and dolomite. It is found that the rates of dissolution increase remarkably after the addition of CA, by a factor of 10 or so at high CO 2 partial pressure (P CO 2) for limestone and about 3 at low P CO 2 for dolomite. It is thus held that the importance of chemical weathering (including the carbonate rock dissolution and silicate weathering) in atmospheric CO 2 precipitation and the mysterious missing precipitation in carbon cycling requires reappraisal. Due to the ignorance of CA as an activator in weathering, previous studies of weathering undoubtedly underestimated weathering rates, and hence the contribution of weathering to the atmospheric CO 2 precipitation was also underestimated. This finding also shows the need to examine in situ distribution and activity of CA in different water bodies and to investigate the role of CA in weathering. |
| LIU Zai-hua.2001.The Role of Carbonic Anhydrase as an Activator in Carbonate Rock Dissolution and Its Significance in Atmospheric CO2 Precipitation[J].Acta Geoscientica Sinica,22(5):477-480. |
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