scholarly journals Seagrass Ecosystems of India as Bioindicators of Trace Elements

2020 ◽  
Author(s):  
Amrit Kumar Mishra ◽  
Rajalaxmi Sahoo ◽  
Saumya Samantaray ◽  
Deepak Apte
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Water Column ◽  
Tamil Nadu ◽  
Gulf Of Mannar ◽  
Seagrass Species ◽  
High Concentration ◽  
Palk Bay ◽  
Trace Element Contamination ◽  
Lakshadweep Islands

Seagrasses are considered as efficient bioindicators of coastal trace element contamination. This chapter provides an overview on the trace element accumulation, tolerance and biomonitoring capacity of the various seagrass species distributed along the coast of India. A total of 10 trace elements are reported in seagrasses, 11 in sediment and nine in the water column from India. From the 11 seagrass species studied, 60% of research have focused on Syringodium isoetifolium, Cymodocea serrulata, Cymodocea rotundata and Halophila ovalis. 78% of seagrass trace element research in India is from Palk bay and Gulf of Mannar (GOM), Tamil Nadu and 16% from Lakshadweep Islands. Out of the 10 trace elements, Cd, Cu, Pb and Zn are the most studied in seagrass, Fe, Mn, Ni and Pb in sediment and Cu, Fe, Mg, Ni and Zn in the water column. Accumulation capacity of various trace elements in seagrass were species-specific. S. isoetifolium have the highest concentration of Cd and Mg at Palk bay and Lakshadweep Islands respectively. The concentration of Cu was higher in C. serrulata at GOM. Halodule uninervis and Halophila decipens have the highest concentration of Co, and Cr, Ni, Pb and Zn from Lakshadweep Islands. The highest concentration of Fe and Mn were highest in Halophila beccarii and H. ovalis from the coast of Goa and Palk bay respectively. Threshold levels (>10 mg L-1) of Cd, Cu, Pb and Zn were observed for C. serrulata, H. ovalis, H. uninervis and T. hemprichii, that can affect the Photo System -II of these seagrasses and exert cellular stress leading to seagrass loss and die-off. High concentration of these elements can exert negative impacts on seagrass associated trophic assemblages and ecosystem functioning. Seagrasses of India can be utilized as bioindicators of coastal trace element contamination but the associated toxicity and human health risks needs further investigation.

Trace-element contamination of a shallow wetland in Western Australia

1997 ◽  
Vol 48 (6) ◽  
pp. 531 ◽  
Author(s):  
T. N. Arnold ◽  
C. E. Oldham
Keyword(s):  
Trace Elements ◽  
Redox Potential ◽  
Trace Element ◽  
Bottom Sediments ◽  
Shallow Lake ◽  
Oxygen Depletion ◽  
Chemical Processes ◽  
Lead Contamination ◽  
Distinct Source ◽  
Trace Element Contamination

The arsenic, chromium, iron and lead contamination of sediments in Lake Yangebup was investigated, focussing on the potential for arsenic to be remobilized during resuspension of contaminated sediments. Despite a distinct source of arsenic, chromium and iron on one shore, horizontal trends in sediment concentrations were weak. Lead concentrations were homogeneous. This indicated a continual remobilization of these trace elements through the lake; a likely mechanism in such a shallow lake is resuspension of bottom sediments. An arsenic maximum was found 10 cm below the surface of the sediment in a settled flocculant layer that predominantly comprised decaying plankton. Remobilization of arsenic from this layer during resuspension was simulated with elutriate tests under both oxic and anoxic conditions. Under oxic conditions, the amount of arsenic released was correlated to the initial concentrations of sediment arsenic, indicating that porewater was the source of arsenic. However, in the anoxic experiments, no such correlations were evident, suggesting that biological or chemical processes were interfering with the redox potential and thus with the release of arsenic. Processes such as stratification, oxygen depletion and reaeration, desorption and adsorption in this shallow lake interact on timescales shorter than those that dominate contaminant cycling in deeper water bodies.

scholarly journals Trace Elements in Groundwater of Chrompet Industrial area of Tamil Nadu

2021 ◽  
Vol 10 (2) ◽  
pp. 1108-1111
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Tamil Nadu ◽  
Industrial Area ◽  
Permissible Limit ◽  
Trace Element Pollution ◽  
Drinking Purpose

The concentrations of the trace elements Fe, Cu, Pb, Mn, Zn were studied in groundwater of Chrompet Industrial area of Tamil Nadu. The degree of trace element pollution and the suitability of groundwater for drinking purpose was assessed. The concentration of Pb found to be present above maximum permissible limit. More than permissible limit of Fe was found around the industrial area. The concentrations of Zn, Cu and Mn are well below the maximum permissible limit as recommended by ISI (1983) for drinking purpose

scholarly journals Trace Element Levels in Native Plant Species around the Industrial Site of Puchuncaví-Ventanas (Central Chile): Evaluation of the Phytoremediation Potential

2021 ◽  
Vol 11 (2) ◽  
pp. 713
Author(s):  
Soroush Salmani-Ghabeshi ◽  
Ximena Fadic-Ruiz ◽  
Conrado Miró-Rodríguez ◽  
Eduardo Pinilla-Gil ◽  
Francisco Cereceda-Balic
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Plant Species ◽  
Transfer Factor ◽  
Power Plants ◽  
Native Plants ◽  
Emission Sources ◽  
Native Plant ◽  
High Concentration ◽  
Native Plant Species

The present work investigates the uptake of selected trace elements (Cu, Sb, As, Pb, Cd, Zn, Cr, Mn, Ni, V, and Co) from soil and their accumulation in the biomass samples (leaves and flowers) of three selected native plants (namely Oenothera picensis, OP; Sphaeralcea velutina, SV; and Argemone subfusiformis, AS) around an industrial area (Puchuncaví-Ventanas) located in the Puchuncaví valley, in the central region of Chile. Primary emission sources in the area come from a copper refinery, coal-fired power plants, and a set of 14 other different industrial facilities. Trace element measurements in the native plants of this area and the ability to transfer of these pollutants from soil to plants (transfer factor) have been assessed in order to identify the potential use of these plant species for phytoremediation. Preliminary results showed a high concentration of trace elements in the OP, SV, and AS samples. The concentration of these elements in the plants was found to be inversely correlated to the distance of the primary emission sources. Moreover, the high concentrations of trace elements such as Cu, As, Cr and V, upon the toxic limits in the native plant species, suggest the need for continuous monitoring of the region. The OP species was identified as the plant with the highest capacity for trace elements accumulation, which also showed higher accumulation potential in whole aerial parts than in leaves. Transfer factor values suggested that these native plants had phytoremediation potential for the elements Cu, Pb, As, Ni, and Cr. This study provides preliminary baseline information on the trace element compositions of important native plants and soil in the Puchuncaví-Ventanas area for phytoremediation purposes.

scholarly journals Magnetic susceptibility and trace element distribution in compost size fractions .

2014 ◽  
Vol 4 ◽  
Author(s):  
Remigio Paradelo ◽  
María Teresa Barral
Keyword(s):  
Trace Elements ◽  
Magnetic Susceptibility ◽  
Trace Element ◽  
Anthropogenic Pollution ◽  
Element Distribution ◽  
Trace Element Distribution ◽  
Size Fractions ◽  
Trace Element Contamination ◽  
The Relationship ◽  
Distribution Of Trace Elements

Magnetic susceptibility can be used for assessing anthropogenic pollution in solid matrices, including soils and composts. This work studies the distribution of trace elements and magnetic susceptibility in the different size fractions of six composts, for the development of measures aimed at reducing compost pollution at the production stage. The results showed that magnetic susceptibility decreased with increasing particle size in all composts, and the same was true for most trace element concentrations. Magnetic susceptibility was significantly correlated with Fe, as well as with Cu, Zn, Pb, Cr and Ni, which proves the relationship between the presence of ferric particles and trace element contamination in compost. Our results suggest that the association of trace elements and magnetic susceptibility is a characteristic feature in municipal solid waste composts.

scholarly journals Trace Metals Distribution in Sulfide Minerals of the Ultramafic-Hosted Hydrothermal Systems: Example from the Kairei Vent Field, Central Indian Ridge

2018 ◽  
Author(s):  
Yejian Wang ◽  
Xiqiu Han ◽  
Sven Petersen ◽  
Matthias Frische ◽  
Zhongyan Qiu ◽  
...  
Keyword(s):  
Trace Elements ◽  
High Temperature ◽  
Trace Element ◽  
Sulfide Minerals ◽  
Hydrothermal Systems ◽  
Trace Element Distribution ◽  
High Concentration ◽  
Central Indian Ridge ◽  
Indian Ridge ◽  
High Concentrations

The ultramafic-hosted Kairei vent field, located at 25°19′S, 70°02′E towards the northern end of the segment 1 of the Central Indian Ridge (CIR-S1) in a water depth of ~2450 m. This study aims to investigate the distribution of trace elements among sulfides of differing textures, and discuss the possible factors controlling the trace element distribution in those minerals by using LA-ICP-MS spot analyses as well as line scans. Our results show that there are distinct systematic trace element distributions throughout the different minerals：(1) Pyrite is divided into three types at the Kairei, including early-stage euhedral pyrites (py-I), sub-euhedral pyrites (py-II), and colloform pyrites (py-III). Pyrite is generally enriched in Mo, Au, As, Tl, Mn, and U. py-I have higher contents of Se, Te, Bi, and Ni, py-II are enriched in Au relative to py-I and py-III, but poor in Ni, py-III are enriched in Mo, Pb, and U but are poor in Se, Te, Bi, and Au. Variations in the concentrations of Se, Te, and Bi in pyrite are likely governed by the strong temperature gradient. Ni is generally lower than Co in pyrites, indicates that our samples precipitated at a high-temperature condition, whereas the extreme Co enrichment is likely from a magmatic heat source combined serpentinization reactions underlie the deposits. (2) Chalcopyrite is characterized by high concentrations of Co, Se, Te. The abundant of Se and Te in chalcopyrite cause by the high solubilities of Se and Te incorporated into chalcopyrite lattice at high temperature fluids. The concentration of Sb, As and Au is relatively low in chalcopyrite from the Kairei vent field. (3) Sphalerite from both the Zn-rich chimney is characterized by high concentrations of Sn, Co, Ga, Ge, Ag, Pb, Sb, As, and Cd, but depleted in Se, Te, Bi, Mo, Au, Ni, Tl, Mn, Ba, V, and U in comparison with the other minerals. The high concentration of Cd and Co is likely caused by the substitution of Cd2+ and Co2+ for Zn2+ in sphalerite. A high concentration of Pb accompanied by high Ag concentration in sphalerite indicating the Ag occurs in the microinclusions of Pb-bearing minerals such as galena. Au is generally low in sphalerite and strong correlate with Pb suggesting its presence in the microinclusions of galena. The strong correlation of As with Ge in sphalerite from Kairei suggests that they might precipitate under medium- to low-temperature with moderately reduced conditions. (4) Bornite-digenite is very low in most trace elements, except for Co, Se, and Bi. The high concentration of Se and Bi in all the sulfide minerals was observed in bornite-digenite can be explained by abundant Bi-selenide inclusions. Serpentinization in ultramafic-hosted hydrothermal systems might play an important role on Au enrichment in pyrite with low As contents. Compared with felsic-hosted seafloor massive sulfide (SMS) deposits, sulfide minerals from the ultramafic-hosted deposits show higher concentrations of Se and Te, but lower As, Sb, and Au concentrations attributed to the contribution of magmatic volatile input. Significant Se enrichment in chalcopyrite has been found from mafic-hosted SMSs indicate that the primary factor that controls the Se enrichment is its temperature-controlled mobility in fluids.

Production of Novel Bioactive Compounds by the Bacteria Associated with Some Marine Sponges of Gulf of Mannar and Palk Bay, Southeast Coast of India

2018 ◽  
Vol 6 (8) ◽  
pp. 183
Author(s):  
V. Ramadas ◽  
G. Chandralega
Keyword(s):  
Bioactive Compounds ◽  
Bacterial Species ◽  
Marine Sponges ◽  
Marine Organisms ◽  
Gulf Of Mannar ◽  
Bacterial Symbionts ◽  
Palk Bay ◽  
Excellent Source

Sponges, exclusively are aquatic and mostly marine, are found from the deepest oceans to the edge of the sea. There are approximately 15,000 species of sponges in the world, of which, 150 occur in freshwater, but only about 17 are of commercial value. A total of 486 species of sponges have been identified in India. In the Gulf of Mannar and Palk Bay a maximum of 319 species of sponges have been recorded. It has been proved that marine organisms are excellent source of bioactive secondary metabolites and number of compounds of originated from marine organisms had been reported to possess in-vitro and in-vivo immuno stimulatory activity. Extracts from 20 sponge species were tested for bacterial symbionts and bioactive compounds were isolated from such associated bacterial species in the present study.

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