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CO2 mineralization induced by fungal nitrate assimilation
Weiguo Hou; Bin Lian; Xiaoqing Zhang
Source PublicationBioresource Technology
AbstractFormation of CaCO3 induced by fungal physiological activities is a potential way to sequestrate atmospheric CO2 in ecosystem. Alternaria sp. is a saprophytic fungus isolated from a forest soil. We examined the precipitation of CaCO3 induced by the fungus in response to different levels of Ca(NO3)2 or CaCl2 in agar media, and the biogenesis of CaCO3 was verified by low δ13C value. The formed CaCO3 was identified as calcite by X-ray diffraction analysis. Square, rectangular and rhombic CaCO3 crystals and amorphous calcium carbonate were observed around mycelia at higher levels of Ca(NO3)2. Acidification occurred in media at low concentrations (0 and 0.0002 M) of Ca(NO3)2, and no CaCO3 formed in these media. The quantities of CaCO3 formed in media increased with increasing concentrations of Ca(NO3)2and were significantly correlated to fungal biomass, pH value and nitrite concentrations. No CaCO3 was formed in media with CaCl2 at all levels. These results collectively indicated that the formation of CaCO3 can be induced by the fungal assimilation of nitrate. The study also revealed that biogenic crystal of CaCO3 tended to grow on a silicon nucleus and the amorphous calcium carbonate (ACC) was the transient stage of CaCO3 crystal.
KeywordCalcium Carbonate Formation Alternaria Sp Nitrate Assimilation Ph Crystal Growth
Subject Area环境地球化学
Indexed BySCI
Document Type期刊论文
Recommended Citation
GB/T 7714
Weiguo Hou,Bin Lian,Xiaoqing Zhang. CO2 mineralization induced by fungal nitrate assimilation[J]. Bioresource Technology,2011,102(2):1562-1566.
APA Weiguo Hou,Bin Lian,&Xiaoqing Zhang.(2011).CO2 mineralization induced by fungal nitrate assimilation.Bioresource Technology,102(2),1562-1566.
MLA Weiguo Hou,et al."CO2 mineralization induced by fungal nitrate assimilation".Bioresource Technology 102.2(2011):1562-1566.
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