Are bacteria capable of precipitating magnesite?

作者：Deelman John C^*

来源：Periodico di Mineralogia, 2012, 81(2): 225-235.

DOI：10.2451/2012PM0013

• magnesite
• laboratory experiments
• reducing conditions
• microbial assemble

Laboratory experiments were conducted to investigate the possible (bio-) chemical pathways involved in the low-temperature nucleation of magnesite, MgCO3. Two compounds known for their power to prevent hydrolysis (amorphous silica and magnesium trisilicate) were tested in contact with a slowly desiccating solution of magnesium bicarbonate. Amorphous silica gave rise to precipitates of nesquehonite instead of the more usual magnesium hydroxide carbonate, thereby illustrating its influence on hydrolysis. Magnesium tri-silicate led to X-ray amorphous precipitates. The presence of reducing compounds, in particular the strongly reducing hydrogen gas, does not lead to the low-temperature nucleation of magnesite.

• 出版日期2012-9