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Position: Home > Articles > Reduction capabilities of microbial Cr(Ⅵ) in anaerobic environment Journal of Northwest A & F University(Natural Science Edition) 2006,34 (10) 107-112

厌氧环境下Cr(Ⅵ)的微生物还原能力

作  者:
李松;曲东
单  位:
西北农林科技大学资源环境学院
关键词:
微生物Cr(Ⅵ)还原;异化Fe(Ⅲ)还原;水稻土
摘  要:
通过接种土壤微生物的混合培养及土壤泥浆培养试验,测定了厌氧培养过程中C r(Ⅵ)和F e(Ⅱ)浓度的变化,研究了不同浓度铬酸盐的微生物还原能力及不同浓度铬酸盐对水稻土中氧化铁还原的影响。结果表明,由水稻土中提取的微生物虽然能够直接还原C r(Ⅵ),但其还原速率和还原程度有限,且C r(Ⅵ)浓度越高,微生物的还原能力越差;不同来源的土壤微生物对C r(Ⅵ)的还原能力有所差异,其中四川水稻土中微生物对C r(Ⅵ)的还原能力均大于江西水稻土;在厌氧培养的水稻土中,添加的C r(Ⅵ)可以较迅速地还原,其中土壤氧化铁的微生物还原过程对C r(Ⅵ)还原具有明显的促进作用;C r(Ⅵ)的存在导致F e(Ⅱ)生成的时间出现滞后,且C r(Ⅵ)浓度越大生成F e(Ⅱ)的滞后时间越长;F e(Ⅱ)产生滞后的时间与C r(Ⅵ)还原结束的时间具有一致性。
译  名:
Reduction capabilities of microbial Cr(Ⅵ) in anaerobic environment
作  者:
LI Song,QU Dong(College of Resources and Environment,Northwest A & F University,Yangling,Shaanxi 712100,China)
关键词:
microbial Cr(Ⅵ) reduction;dissimilatory iron reduction;paddy soil
摘  要:
The changes of Cr(Ⅵ) and Fe(Ⅱ) concentration were measured during Co-culture experiment and slurry experiments.The microbial reducing ability of different chromate concentrations and the effect of chromate on dissimilatory iron reduction in paddy soil were investigated.The result indicated that,although microorganism from paddy soil could directly reduce Cr(Ⅵ),the reduecing rate and efficiency were limited;the higher Cr(Ⅵ) concentration was,the less reducing ability the microbial showed;the microbe from different paddy soils had different effects on Cr(Ⅵ) reducing abilities;The reducing ability of the microbe from Sichuan paddy soil was higher than that from Jiangxi paddy soil.Cr(Ⅵ) added could be rapidly reduced in paddy soil under anaerobic incubation,moreover,the process of dissimilatory iron reduction of soil could obviously promote the Cr(Ⅵ) reduction.The existent of Cr(Ⅵ) could delay the appearance of Fe(Ⅱ);the higher Cr(Ⅵ) concentration was,the later Fe(Ⅱ) appeared.The delayed time of Fe(Ⅱ) appearance was in accordance with the ending time of Cr(Ⅵ) reduction.
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