DEHALOGENATION IN MARINE-SEDIMENTS CONTAINING NATURAL SOURCES OF HALOPHENOLS
DEHALOGENATION IN MARINE-SEDIMENTS CONTAINING NATURAL SOURCES OF HALOPHENOLS
复制标题
DOI：
10.1128/aem.54.12.3079-3085.1988
复制
发表时间：
1988-12-01
影响因子：
4.4
通讯作者：
KING, GM
中科院分区：
文献类型：
--
作者：
KING, GM
由于各种动物和藻类的活动，一些海洋沉积物中自然存在卤代酚，如2，4-二溴苯酚(DBP)。在早期的一项研究中，在科瓦列夫斯基的洞穴微环境中观察到了DBP。在洞穴衬里发现的浓度下，有氧呼吸似乎相对于无氧分解代谢明显受到抑制。这一影响以及导致DBP降解的因素在这里有进一步的记录。在好氧和缺氧底泥中添加放射性标记的DBP，以及好氧和厌氧富集生长实验的结果表明，好氧菌不能显著代谢DBP，可能在洞壁内表面遇到的浓度是抑制的。相比之下，暴露在1 mM DBP下的厌氧菌对生长的抑制作用很小；此外，在厌氧条件下，DBP在浓缩物和沉积物中都被大量降解。脱卤化和随后产生的苯酚似乎启动了厌氧降解。硫酸盐还原菌不能脱卤化DBP，但似乎能降解苯酚。细菌数量的减少以及沉积物中铁的浓度和化学形态的显著差异可能是由于DBP对好氧细菌的毒性作用。
Halophenols such as 2,4-dibromophenol (DBP) occur naturally in some marine sediments, as a consequence of various animal and algal activities. In an earlier study, DBP was observed in the burrow microenvironment of the hemichordate Saccoglossus kowalewskii. At the concentrations found in the burrow lining, aerobic respiration appeared to be inhibited significantly relative to anaerobic catabolism. This effect, as well as factors contributing to the degradation of DBP, has been documented further here. Results from the addition of radiolabeled DBP to oxic and anoxic sediment slurries and growth experiments with aerobic and anaerobic enrichments suggested that aerobes did not significantly metabolize DBP and that concentrations likely to be encountered on the inner surfaces of the burrow wall were inhibitory. In contrast, only minimal inhibition of growth occurred for anaerobes exposed to 1 mM DBP; in addition, DBP was substantially degraded in both enrichments and sediments under anaerobic conditions. Dehalogenation with the consequent production of phenol appeared to initiate anaerobic degradation. Sulfate-reducing bacteria did not dehalogenate DBP but appeared to degrade phenol. Decreased bacterial numbers and marked differences in the concentration and chemical speciation of iron in sediments from S. kowalewskii burrow may be attributed to toxic effects of DBP on aerobic bacteria.