Extent of copper tolerance and consequences for functional stability of the ammonia-oxidizing community in long-term copper-contaminated soils

2010 ◽  
Vol 29 (1) ◽  
pp. 27-37 ◽  
Author(s):  
Jelle Mertens ◽  
Steven A. Wakelin ◽  
Kris Broos ◽  
Mike J. McLaughlin ◽  
Erik Smolders
Keyword(s):  
Contaminated Soils ◽  
Copper Tolerance ◽  
Functional Stability ◽  
Copper Contaminated

scholarly journals EFFECTS OF COPPER TOXICITY ON DIFFERENT GROWTH ATTRIBUTES OF PHLOX DRUMMONDII

2021 ◽  
Vol 5 (1) ◽  
pp. 58-63
Author(s):  
Syeda Fatima ◽  
Nazia Aslam ◽  
Sofia Khalid
Keyword(s):  
Contaminated Soils ◽  
Heavy Metal Contamination ◽  
Growth Parameters ◽  
Copper Toxicity ◽  
Copper Tolerance ◽  
High Concentration ◽  
Stunted Growth ◽  
Relative Water ◽  
Copper Contaminated ◽  
Phlox Drummondii

Heavy metal contamination is one of the major problems prevailing in environment. Copper in high concentration is considered to have serious effects on plant growth parameters which results in chlorosis, disturbed mineral uptake and stunted growth. A pot experiment was conducted to evaluate the ability of Phlox drummondii to tolerate and accumulate high copper doses. Plants were exposed to copper toxicity at three different concentrations (10 ppm, 20 ppm and 30 ppm) by using copper sulfate (CuSO4.5H2O). Results showed that chlorophyll-a, chlorophyll-b, total chlorophyll and carotenoids of treated plants decreased significantly (p˂0.05) with the increase of copper concentration. Selected copper levels showed no effect on plant height, number of leaves, leaf area and ascorbic acid (p>0.05). Relative water content increased significantly (p˂0.05) as compared to control plants. Copper uptake by roots of treated plants was greater as compared to control plants indicating Phlox drummondii ability to grow well in the copper contaminated soils and could be classified as copper tolerant plant. Copper tolerance by phlox was associated with its capacity to absorb and accumulate in roots preventing translocation of metal to other photosynthetic tissues. Therefore, Phlox drummondii has the characteristic to be used as hyperaccumulator by vegetating in copper contaminated soils. Further studies at genetic level would play a key role in understanding the tolerance mechanism of Phlox drummondii towards copper contamination.

scholarly journals Remediation of mercury-contaminated soils and sediments using biochar: a critical review

Biochar ◽  
2021 ◽  
Author(s):  
Qian Yang ◽  
Yongjie Wang ◽  
Huan Zhong
Keyword(s):  
Health Risks ◽  
Contaminated Soils ◽  
Functional Materials ◽  
Redox Conditions ◽  
Existing Problems ◽  
Soils And Sediments ◽  
Underlying Mechanisms ◽  
Biochar Amendment

AbstractThe transformation of mercury (Hg) into the more toxic and bioaccumulative form methylmercury (MeHg) in soils and sediments can lead to the biomagnification of MeHg through the food chain, which poses ecological and health risks. In the last decade, biochar application, an in situ remediation technique, has been shown to be effective in mitigating the risks from Hg in soils and sediments. However, uncertainties associated with biochar use and its underlying mechanisms remain. Here, we summarize recent studies on the effects and advantages of biochar amendment related to Hg biogeochemistry and its bioavailability in soils and sediments and systematically analyze the progress made in understanding the underlying mechanisms responsible for reductions in Hg bioaccumulation. The existing literature indicates (1) that biochar application decreases the mobility of inorganic Hg in soils and sediments and (2) that biochar can reduce the bioavailability of MeHg and its accumulation in crops but has a complex effect on net MeHg production. In this review, two main mechanisms, a direct mechanism (e.g., Hg-biochar binding) and an indirect mechanism (e.g., biochar-impacted sulfur cycling and thus Hg-soil binding), that explain the reduction in Hg bioavailability by biochar amendment based on the interactions among biochar, soil and Hg under redox conditions are highlighted. Furthermore, the existing problems with the use of biochar to treat Hg-contaminated soils and sediments, such as the appropriate dose and the long-term effectiveness of biochar, are discussed. Further research involving laboratory tests and field applications is necessary to obtain a mechanistic understanding of the role of biochar in reducing Hg bioavailability in diverse soil types under varying redox conditions and to develop completely green and sustainable biochar-based functional materials for mitigating Hg-related health risks.

Managing long-term polycyclic aromatic hydrocarbon contaminated soils: a risk-based approach

2013 ◽  
Vol 22 (12) ◽  
pp. 8927-8941 ◽  
Author(s):  
Luchun Duan ◽  
Ravi Naidu ◽  
Palanisami Thavamani ◽  
Jean Meaklim ◽  
Mallavarapu Megharaj
Keyword(s):  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Contaminated Soils ◽  
Polycyclic Aromatic

scholarly journals Evaluation of two Brazilian indigenous plants for phytostabilization and phytoremediation of copper-contaminated soils

2015 ◽  
Vol 75 (4) ◽  
pp. 868-877 ◽  
Author(s):  
R. Andreazza ◽  
L. Bortolon ◽  
S. Pieniz ◽  
F. M. Bento ◽  
F. A. O. Camargo
Keyword(s):  
Contaminated Soils ◽  
Mining Waste ◽  
Metal Extraction ◽  
Copper Mining ◽  
Tolerance Index ◽  
Effective Number ◽  
Indigenous Plants ◽  
Micronutrient Uptake ◽  
Vineyard Soils ◽  
Copper Contaminated

Abstract Indigenous plants have been grown naturally and vigorously in copper contaminated soils. Thus, the aim of this study was to evaluate the phytoremediation ability of two indigenous plants naturally grown in two vineyard soils copper contaminated, and in a copper mining waste. However, it was evaluated the macro and micronutrient uptake and the potential of phytoremediation. So, a greenhouse study was carried out with Bidens pilosa and Plantago lanceolata in samples of vineyard soils (Inceptisol and Mollisol) copper contaminated, and in a copper mining waste. Plant growth, macro and micronutrient up take, tolerance index (TI), translocation factor (TF), metal extraction ratio (MER), bioaccumulation factor (BCF), plant effective number of the shoots (PENs), and plant effective number of the total plant (PENt) were analyzed. Both plants grown in vineyard soils showed high phytomass production and TI. P. lanceolata plants cultivated in the Inceptisol showed the highest copper concentrations in the shoots (142 mg kg–1), roots (964 mg kg–1) and entire plants (1,106 mg kg–1). High levels of copper were phytoaccumulated from the Inceptisol by B. pilosa and P. lanceolata with 3,500 and 2,200 g ha–1 respectively. Both B. pilosa and P. lanceolata plants showed characteristics of high copper hyperaccumulator. Results showed that both species play an important role in the natural copper phytoaccumulation in both vineyard soils contaminated with copper, being important to its phytoremediation.

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