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排序方式: 共有163条查询结果,搜索用时 15 毫秒
1.
Roseli M. Dias Jessica G. Silv Vicelma L. Cardoso Miriam M. de Resende 《环境科学学报(英文版)》2020,32(5):151-159
Two chromium removal experiments were performed in bioreactors with and without a magnetic field under the same conditions.The release of the chromium present in the biomass was tested in two experiments one with the initial pH of the medium and one with pH 4.0.The objective was to remove Cr(Ⅵ) and total Cr from the effluent,this was carried out by placing biological treatments of synthetic effluent contaminated with 100 mg/L of Cr(Ⅵ) in a bioreactor with neodymium magnets that applied a magnetic field(intensity85.4 mT) to the mixed culture.The removal of Cr(Ⅵ) was approximately 100.0% for the bioreactor with a magnetic field and 93,3% for the bioreactor without a magnetic field for9 hr of recirculation of the synthetic effluent by the bioreactor.The removal of total Cr was61.6% and 48.4%,with and without a magnetic field,respectively;for 24 hr.The desorption of Cr(VI) in the synthetic effluent was 0.05 mg/L,which is below the limit established by Brazilian legislation(0.1 mg/L) for the discharge of effluent containing Cr(Ⅵ) into bodies of water.The results obtained for the removal of chromium in synthetic effluent suggested that there was no significant influence on the viable cell count of the mixed culture.The desorption of Cr(Ⅵ) in synthetic effluent after bioadsorption of chromium by the mixed culture in the process of removal of chromium in bioreactors with and without a magnetic field was not significant in either of the experiments with different initial pHs. 相似文献
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分光光度法测定水样中铬 总被引:3,自引:0,他引:3
在pH4.4HAC-NaAc缓冲介质及乳化剂OP存在下,Cr6+与二溴羟基苯基荧光酮(DBHPF)显色反应生成桔红色络合物.该络合物最大吸收位于482nm波长处,表现摩尔吸光系数εmax=3.47×104.络合物配位比为Cr6+:DBHPF=2:3,Cr6+在0-16μg/25mL范围内遵守比耳定律.方法已用于水样中微量铬的测定,结果满意. 相似文献
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太原市蔬菜中铅、铬和镉含量分析及安全性评价 总被引:14,自引:0,他引:14
白红娟 《中国安全科学学报》2004,14(12):78-81
笔者采用原子吸收光谱法 ,测定了太原市蔬菜批发市场的 8种蔬菜 72个样品的铅、铬、镉含量。结果表明 :在检测的 8种蔬菜中 ,有 5种蔬菜出现铅含量超标 ,铅是蔬菜中的主要污染元素 ,且污染带有普遍性 ;铬的污染仅出现在芹菜和青菜上 ,其他 6种蔬菜均无超标 ;8种蔬菜均未受到镉的污染 ,合格率为 10 0 %。参照国家食品卫生标准和蔬菜质量分级标准 ,对蔬菜的重金属污染程度进行了安全性评价。在所检测的蔬菜样品中 ,只有青菜受到重金属污染 ,其综合污染指数为 1.12 ,污染程度为轻度污染。其他蔬菜的综合污染指数均低于 0 .7,污染程度均为安全 ,污染水平均为清洁。 相似文献
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Yaxian Zhang 《环境科学学报(英文版)》2017,29(7):329-337
The purpose of this study is to investigate the effects of nano-sized or submicro Fe_2O_3/Fe_3O_4 on the bioreduction of hexavalent chromium(Cr(VI)) and to evaluate the effects of nano-sized Fe_2O_3/Fe_3O_4 on the microbial communities from the anaerobic flooding soil.The results indicated that the net decreases upon Cr(VI) concentration from biotic soil samples amended with nano-sized Fe_2O_3(317.1 ± 2.1 mg/L) and Fe_3O_4(324.0 ± 22.2 mg/L) within21 days,which were approximately 2-fold of Cr(VI) concentration released from blank control assays(117.1 ± 5.6 mg/L).Furthermore,the results of denaturing gradient gel electrophoresis(DGGE) and high-throughput sequencing indicated a greater variety of microbes within the microbial community in amendments with nano-sized Fe_2O_3/Fe_3O_4 than the control assays.Especially,Proteobacteria occupied a predominant status on the phylum level within the indigenous microbial communities from chromium-contaminated soils.Besides,some partial decrease of soluble Cr(VI) in abiotic nano-sized Fe_2O_3/Fe_3O_4 amendments was responsible for the adsorption of nano-sized Fe_2O_3/Fe_3O_4 to soluble Cr(VI).Hence,the presence of nano-sized Fe_2O_3/Fe_3O_4 could largely facilitate the mobilization and biotransformation of Cr(VI) from flooding soils by adsorption and bio-mediated processes. 相似文献
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Changes of organic acid exudation and rhizosphere pH in rice plants under chromium stress. 总被引:1,自引:0,他引:1
Fanrong Zeng Song Chen Ying Miao Feibo Wu Guoping Zhang 《Environmental pollution (Barking, Essex : 1987)》2008,155(2):284-289
The effect of chromium (Cr) stress on the changes of rhizosphere pH, organic acid exudation, and Cr accumulation in plants was studied using two rice genotypes differing in grain Cr accumulation. The results showed that rhizosphere pH increased with increasing level of Cr in the culture solution and with an extended time of Cr exposure. Among the six organic acids examined in this experiment, oxalic and malic acid contents were relatively higher, and had a significant positive correlation with the rhizosphere pH, indicating that they play an important role in changing rhizosphere pH. The Cr content in roots was significantly higher than that in stems and leaves. Cr accumulation in plants was significantly and positively correlated with rhizosphere pH, and the exudation of oxalic, malic and citric acids, suggesting that an increase in rhizosphere pH, and exudation of oxalic, malic and citric acid enhances Cr accumulation in rice plants. 相似文献
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