矿化(土壤科学)
藻类
环境化学
富营养化
蓝藻
化学
微生物降解
微生物
植物
生物
细菌
营养物
氮气
有机化学
遗传学
作者
Huey–Min Hwang,Robert E. Hodson,R. F. Lee
标识
DOI:10.1128/aem.50.5.1177-1180.1985
摘要
Surface waters from a eutrophic lake in northern Georgia were incubated with 14 C-labeled 2,4,5-trichloroaniline to study the disappearance of the parent compound and production of 14 CO 2 . There was no degradation of the compound in the dark. Under 12 h of sunlight and 12 h of darkness, 28% of the trichloroaniline was degraded in both poisoned and untreated samples. Mineralization after 24 h in poisoned and untreated lake water was 5.5 and 6.8%, respectively. Thus, 81% of the mineralization was attributable to photochemical processes, and 19% was attributable to microbial processes. Most biological mineralization was due to microbes of bacterial size (<1.0 μm). Approximately 90% of the trichloroaniline bioaccumulated was associated with organisms larger than 1.0 μm, e.g., algae. When algae were removed by filtration, the amount of trichloroaniline mineralized increased to 9.4%, compared with 6.8% in the presence of algae. The excretion of organic compounds by algae may have inhibited bacterial mineralization of photoproducts.
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