Heavy metal incorporation in foraminiferal calcite under variable environmental and acute level seawater pollution: multi-element culture experiments for Amphisorus hemprichii

2021 ◽  
Author(s):  
Netramani Sagar ◽  
Aleksey Sadekov ◽  
Talia Jenner ◽  
Lorie Chapuis ◽  
Peter Scott ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Incorporation

scholarly journals The Potential of Heavy Metal Incorporation into Clay Precursors

2019 ◽  
Vol 8 (3) ◽  
pp. 4839-4845
Keyword(s):  
Heavy Metal ◽  
Environmental Pollution ◽  
Industrial Activities ◽  
Lead And Cadmium ◽  
Metal Waste ◽  
Global Issue ◽  
Good Potential ◽  
Copper Zinc ◽  
Metal Incorporation ◽  
Heavy Metal Waste

High amount of heavy metal waste produced from the industrial activities has become an important global issue for several decades due to its hazardous effect on the human and environment. Since heavy metal is highly toxic and cannot be eliminated easily, the application to reuse the heavy metal waste without harming the environment must be investigated thoroughly. This paper reviews the incorporation of heavy metal into clay precursors as a good potential for the reduction of environmental pollution. The results from the previous studies show the transformation of heavy metal such as copper, zinc, lead and cadmium into less hazardous species when incorporating into clay precursors. These transformations have reduced the mobility of heavy metal as a crystalline structure is formed after the thermal treatment. It is found that the immobilization process successfully stabilizing heavy metal and increases the metal’s resistance against the acidic attack through the formation of low permeable structure in the clay precursors. Hence, the incorporation of heavy metal into clay precursors is proven to be a great prospect in reducing environmental pollution.

scholarly journals Metal Bioaccumulation by Carp and Catfish Cultured in Lake Chapala, and Weekly Intake Assessment

2021 ◽  
Vol 11 (13) ◽  
pp. 6087
Author(s):  
Claudia Alvarado ◽  
Diego M. Cortez-Valladolid ◽  
Enrique J. Herrera-López ◽  
Ximena Godínez ◽  
José Martín Ramírez
Keyword(s):  
Heavy Metal ◽  
Ictalurus Punctatus ◽  
Heavy Metal Contamination ◽  
Heavy Metal Accumulation ◽  
Human Consumption ◽  
Main Concern ◽  
Metal Bioaccumulation ◽  
Lake Chapala ◽  
Cultured Fish ◽  
Metal Incorporation

Aquaculture offers great potential for fish production in Lake Chapala, but reports of heavy metal contamination in fish have identified a main concern for this activity. In the present study, cultures of the species Cyprinus carpio and Ictalurus punctatus were grown in a net cage in Lake Chapala. The patterns of heavy metal accumulation (Cu, Zn, Cd, Hg, Pb, As) in muscle and liver were monitored in order to evaluate the level of metal incorporation in the fish. Estimates of weekly metal intake (EWI) were made based on the results of the concentrations in edible parts of fish of commercial size. The patterns of metal bioaccumulation between tissues and species showed that liver had a higher concentrating capacity for Zn, Cu, Cd, and Pb. In contrast, similar concentrations of Hg and As were found in the liver and muscle tissue. According to the EWI estimates, the heavy metals in these cultured fish do not represent a risk for human consumption.

scholarly journals Characterization of Heavy Metal Incorporation in Calcite by XAFS Spectroscopy

1997 ◽  
Vol 7 (C2) ◽  
pp. C2-793-C2-797 ◽  
Author(s):  
G. M. Lamble ◽  
R. J. Reeder ◽  
P. A. Northrup
Keyword(s):  
Heavy Metal ◽  
Xafs Spectroscopy ◽  
Metal Incorporation

scholarly journals Lead and Cadmium Immobilization by Polymeric Sponges Coated with Hydroxyapatite

2008 ◽  
Vol 396-398 ◽  
pp. 561-564 ◽  
Author(s):  
Elena Mavropoulos ◽  
Nilce C.C. da Rocha ◽  
M.L.F.M. Kede ◽  
Marcelo Henrique Prado da Silva ◽  
Josino C. Moreira ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Bone Tissue ◽  
Cadmium Uptake ◽  
Sorption Experiment ◽  
Lead And Cadmium ◽  
Hydroxyapatite Powder ◽  
Before And After ◽  
Metal Incorporation

Polymeric sponges coated with hydroxyapatite were used in lead and cadmium uptake experiments in order to mimetizes heavy metal incorporation by bone tissue. The hydroxyapatite-coated sponges (S-HA) were obtained by hydrothermal alkali conversion from monetite. The results showed that S-HA were efficient in immobilizing Pb and Cd. The uptake experiments using hydroxyapatite powder (HA) removed almost 100% of Pb2+ and 59% of Cd2+. When polymeric sponges coated with hydroxyapatite were used, the removal of Cd2+ and Pb2+ decreased, respectively, to closely 14 % and 74%, after 24 hours sorption. Before and after sorption experiment MEV analysis indicated precipitation of pyromorphite on hydroxyapatite-coated sponges.

scholarly journals Heavy metal incorporation into benthic foraminifera – A culturing study

2021 ◽  
Author(s):  
Sarina Schmidt ◽  
Ed Hathorne ◽  
Joachim Schönfeld
Keyword(s):  
Heavy Metal ◽  
Benthic Foraminifera ◽  
Metal Incorporation

scholarly journals Heavy Metal Incorporation during Goethite Oriented Attachment

2020 ◽  
Author(s):  
Sebastian Mergelsberg ◽  
Guomin Zhu ◽  
Jennifer Soltis ◽  
Martin McBriarty ◽  
Elias Nakouzi ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Oriented Attachment ◽  
Metal Incorporation

Complementary Z-Contrast Imaging and Digital Image Processing

1985 ◽  
Vol 43 ◽  
pp. 304-305
Author(s):  
K. N. Colonna ◽  
G. Oliphant
Keyword(s):  
Image Processing ◽  
Heavy Metal ◽  
Digital Image Processing ◽  
Digital Image ◽  
Biological Tissue ◽  
Biological Imaging ◽  
Tissue Preparation ◽  
Contrast Imaging ◽  
Imaging Tool ◽  
Z Contrast

Harmonious use of Z-contrast imaging and digital image processing as an analytical imaging tool was developed and demonstrated in studying the elemental constitution of human and maturing rabbit spermatozoa. Due to its analog origin (Fig. 1), the Z-contrast image offers information unique to the science of biological imaging. Despite the information and distinct advantages it offers, the potential of Z-contrast imaging is extremely limited without the application of techniques of digital image processing. For the first time in biological imaging, this study demonstrates the tremendous potential involved in the complementary use of Z-contrast imaging and digital image processing.Imaging in the Z-contrast mode is powerful for three distinct reasons, the first of which involves tissue preparation. It affords biologists the opportunity to visualize biological tissue without the use of heavy metal fixatives and stains. For years biologists have used heavy metal components to compensate for the limited electron scattering properties of biological tissue.

Recent Progress In High-Resolution Shadowing For Biological Transmission Electron Microscopy

1990 ◽  
Vol 48 (1) ◽  
pp. 510-511 ◽  
Author(s):  
Heinz Gross ◽  
Katarina Krusche ◽  
Peter Tittmann
Keyword(s):  
Heavy Metal ◽  
High Resolution ◽  
Freeze Drying ◽  
Atmospheric Conditions ◽  
Vacuum Equipment ◽  
Transmission Electron ◽  
Gas Atmosphere ◽  
Gas Molecules ◽  
Residual Gas ◽  
Backing Layer

Freeze-drying followed by heavy metal shadowing is a long established and straight forward approach to routinely study the structure of dehydrated macromolecules. Very thin specimens such as isolated membranes or single macromolecules are directly adsorbed on C-coated grids. After rapid freezing the grids are transferred into a suitable vacuum equipment for freeze-drying and heavy metal shadowing.To improve the resolution power of shadowing films we introduced shadowing at very low specimen temperature (−250°C). To routinely do that without the danger of contamination we developed in collaboration with Balzers an UHV (p≤10-9 mbar) machine (BAF500K, Fig.2). It should be mentioned here that at −250°C the specimen surface acts as effective cryopump for practically all impinging residual gas molecules from the residual gas atmosphere.Common high resolution shadowing films (Pt/C, Ta/W) have to be protected from alterations due to air contact by a relatively thick C-backing layer, when transferred via atmospheric conditions into the TEM. Such an additional C-coat contributes disturbingly to the contrast at high resolution.

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