微生物对汞矿区农田土壤汞甲基化的影响
发布时间：2019-01-19 14:57
【摘要】：为研究典型汞矿区农田土壤中汞的甲基化作用,实验以受汞污染的旱田土壤和稻田土壤为对象,分别进行灭菌,促进硫酸盐还原菌(SRB)活性处理,抑制SRB活性处理以及促进铁还原菌(FeRB)活性处理,分析非微生物作用和微生物作用对土壤甲基汞(MeHg)生成的影响.结果表明,促进SRB活性处理的土壤MeHg生成量最高,其中旱田土MeHg增量为0.15~0.38μg·kg~(-1),稻田土壤MeHg增量为1~2μg·kg~(-1);抑制SRB活性处理和促进FeRB活性处理的MeHg增量较小,最高值仅为0.025μg·kg~(-1).相比于旱田土壤,稻田土壤具有更高的汞甲基化能力,其MeHg生成量是旱田土壤的4~9倍.土壤SRB数量与MeHg生成量具有相同的变化趋势,二者具有显著的正相关性(R~2=0.57,P0.01).因此,该研究区土壤汞甲基化作用主要是微生物汞甲基化作用,且主要的汞甲基化细菌是SRB.此外,稻田是农田中MeHg生成的活跃地区,在评估和控制MeHg对人体健康危害时需要重点关注.
[Abstract]:In order to study the methylation of mercury in farmland soil of typical mercury mining area, the dry soil and paddy soil polluted by mercury were sterilized separately to promote the treatment of sulfate reducing bacteria (SRB) activity. The inhibition of SRB activity and the promotion of (FeRB) activity of iron reducing bacteria were studied. The effects of non-microbial and microbial action on the production of methylmercury (MeHg) in soil were analyzed. The results showed that the soil MeHg production was the highest under the treatment of SRB activity, in which the increment of MeHg in dry soil was 0.38 渭 g kg~ (-1), and the increment of MeHg in paddy soil was 1 渭 g kg~ (-1). The increment of MeHg in the treatment of inhibiting SRB activity and promoting the activity of FeRB was small, and the highest value was only 0.025 渭 g kg~ (-1). Compared with dry soil, paddy soil has higher mercury methylation ability, and its MeHg production is 4 ~ 9 times of that of dry soil. The amount of SRB and the amount of MeHg in soil had the same changing trend, and there was a significant positive correlation between them (RP0.01). Therefore, the soil mercury methylation in the study area is mainly microbial mercury methylation, and the main mercury methylation bacteria are SRB.. In addition, paddy field is an active area where MeHg is generated in farmland, and attention should be paid to the assessment and control of MeHg harm to human health.
【作者单位】： 北京师范大学水科学研究院;中国环境科学研究院固体废物污染控制技术研究所;
【基金】：环境保护公益性行业科研专项
【分类号】：X172;X53
本文编号：2411478
[Abstract]:In order to study the methylation of mercury in farmland soil of typical mercury mining area, the dry soil and paddy soil polluted by mercury were sterilized separately to promote the treatment of sulfate reducing bacteria (SRB) activity. The inhibition of SRB activity and the promotion of (FeRB) activity of iron reducing bacteria were studied. The effects of non-microbial and microbial action on the production of methylmercury (MeHg) in soil were analyzed. The results showed that the soil MeHg production was the highest under the treatment of SRB activity, in which the increment of MeHg in dry soil was 0.38 渭 g kg~ (-1), and the increment of MeHg in paddy soil was 1 渭 g kg~ (-1). The increment of MeHg in the treatment of inhibiting SRB activity and promoting the activity of FeRB was small, and the highest value was only 0.025 渭 g kg~ (-1). Compared with dry soil, paddy soil has higher mercury methylation ability, and its MeHg production is 4 ~ 9 times of that of dry soil. The amount of SRB and the amount of MeHg in soil had the same changing trend, and there was a significant positive correlation between them (RP0.01). Therefore, the soil mercury methylation in the study area is mainly microbial mercury methylation, and the main mercury methylation bacteria are SRB.. In addition, paddy field is an active area where MeHg is generated in farmland, and attention should be paid to the assessment and control of MeHg harm to human health.
【作者单位】： 北京师范大学水科学研究院;中国环境科学研究院固体废物污染控制技术研究所;
【基金】：环境保护公益性行业科研专项
【分类号】：X172;X53
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