摘要
本文介绍实验室中进行的螺旋藻聚磷作用试验,用微机数据采集系统作精确记录.其结果表明藻类在对数生长期通过两种途径进行聚磷作用.其一是改变环境的pH值、离子平衡系统和氧化还原电位促进磷酸盐形成并沉淀;其二是藻细胞的吸附和吸收富集磷.这些为生物成矿学说提供了有价值的新证据.
This paper introduceds a simulated test of phosphoric accumulation by algal culture in the laboratory. The results show that there are two ways to accumulate phosphate. The first, algae promote the formation and diposition of phosphate by change of the pH; the balance system of ions; and the oxidation-reduction potential (Eh) in environment during the logarithmic growth phase. The second, cells get phosphorus by cellular absorption and adsorption.
These provided a valuable evidence for the theory of biological mineralization.
The main principle of environmental change are as follows:
CO2+ H2O=H2CO3H++ HCO3-=2H++CO32-
When the CO2 in cultural liquid consumed by algal phosynthesis, the balancing equation moves towards the left, that H+ concentration drops and pH rises.
Eh is general reflection of varied ions-fluctuation, it is closely related with pH value in two ways:
1) H+ directly participats in oxidation-reduction reaction.
2) H+ changes the balancing system of original ions by dissociation of reducing agent and oxidizing agent, influence the value of Eh finally.
The difference of algal phosphoric accumulation can be seen from Table 4 and Table 5. The accumulation phosphates of algal cells in No. 4 are up to 9.1% of its dry weight. These data show that phosphoric weight of algal bodies are related to PO43- concentration in its habitat and grown days during logarithmic growth stage.
出处
《沉积学报》
CAS
CSCD
北大核心
1992年第1期101-107,共7页
Acta Sedimentologica Sinica
基金
自然科学基金资助项目
