Hydrogel-Encapsulated Enzyme Facilitates Colorimetric Acute Toxicity Assessment of Heavy Metal Ions

2018 ◽  
Vol 10 (31) ◽  
pp. 26705-26712 ◽  
Author(s):  
Yue Zhang ◽  
Tingting Ren ◽  
Hua Tian ◽  
Binbin Jin ◽  
Junhui He
Keyword(s):  
Heavy Metal ◽  
Acute Toxicity ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Toxicity Assessment

The acute toxicity of some heavy metal ions toward benthic organisms

1973 ◽  
Vol 10 (5) ◽  
pp. 291-294 ◽  
Author(s):  
Robert Rehwoldt ◽  
Lawrence Lasko ◽  
Charles Shaw ◽  
Ellena Wirhowski
Keyword(s):  
Heavy Metal ◽  
Acute Toxicity ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Benthic Organisms

Toxicity of Three Heavy Metal Pollutants of the Pharmaceutical Wastewater to Paramecium Caudatum

2014 ◽  
Vol 937 ◽  
pp. 571-577 ◽  
Author(s):  
Zi Lin Gong ◽  
Ying Chen ◽  
Yan Yan ◽  
Si Ying Pei ◽  
Di Wu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Acute Toxicity ◽  
Population Growth ◽  
Metal Ions ◽  
Growth Curve ◽  
Heavy Metal Ions ◽  
Pharmaceutical Wastewater ◽  
Emission Standard ◽  
Metal Pollutants ◽  
Heavy Metal Pollutants

In order to provide information for biological monitoring of environmental pollution and help people to develop pharmaceutical wastewater pollutant monitoring and emission standard, in this paper, acute toxicity experiments of three heavy metal pollutants, Zn2+,Cd2+ and Hg2+ existed usually in pharmaceutical wastewater, were done and their 24hr LC50 on the Paramecium were got individually, safety thresholds were calculated. At the same time, impact of different concentration heavy metal ions on population growth curve of Paramecium caudatum were researched. Results indicated that the acute toxicity of Hg2+ are the strongest, and the population growth curve changed significantly by three different types under three heavy metal ions pressure.

The effect of increased temperature upon the acute toxicity of some heavy metal ions

1972 ◽  
Vol 8 (2) ◽  
pp. 91-96 ◽  
Author(s):  
Robert Rehwoldt ◽  
Lawrence W. Menapace ◽  
Brian Nerrie ◽  
Denise Alessandrello
Keyword(s):  
Heavy Metal ◽  
Acute Toxicity ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Increased Temperature

Bioadsorption of Multiple Heavy Metal Ions by Rhizophora Apiculate sp. and Elaesis Guineensis sp.

2017 ◽  
Vol 14 (1) ◽  
pp. 15
Author(s):  
M.B. Nicodemus Ujih ◽  
Mohammad Isa Mohamadin ◽  
Milla-Armila Asli ◽  
Bebe Norlita Mohammed
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Removal Efficiency ◽  
Heavy Metal Ions ◽  
Agricultural Waste ◽  
Living Organism ◽  
Heavy Metal Concentration ◽  
Industrial Area ◽  
Electrochemical Treatment ◽  
Chemical Oxidation

Heavy metal ions contamination has become more serious which is caused by the releasing of toxic water from industrial area and landfill that are very harmful to all living organism especially human and can even cause death if contaminated in small amount of heavy metal concentration. Currently, peoples are using classic method namely electrochemical treatment, chemical oxidation/reduction, chemical precipitation and reverse osmosis to eliminate the metal ions from toxic water. Unfortunately, these methods are costly and not environmentally friendly as compared to bioadsorption method, where agricultural waste is used as biosorbent to remove heavy metals. Two types of agricultural waste used in this research namely oil palm mesocarp fiber (Elaesis guineensis sp.) (OPMF) and mangrove bark (Rhizophora apiculate sp.) (MB) biomass. Through chemical treatment, the removal efficiency was found to improve. The removal efficiency is examined based on four specification namely dosage, of biosorbent to adsorb four types of metals ion explicitly nickel, lead, copper, and chromium. The research has found that the removal efficiency of MB was lower than OPMF; whereas, the multiple metals ions removal efficiency decreased in the order of Pb2+ > Cu2+ > Ni2+ > Cr2+.

Comparative Bio-sorption of Cadmium and Nickel Ions from Aqueous Solution onto Fibers of Date Palm using Fluidized Bed Column

2019 ◽  
Vol 70 (5) ◽  
pp. 1507-1512
Author(s):  
Baker M. Abod ◽  
Ramy Mohamed Jebir Al-Alawy ◽  
Firas Hashim Kamar ◽  
Gheorghe Nechifor
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Fluidized Bed ◽  
Removal Efficiency ◽  
Heavy Metal Ions ◽  
Date Palm ◽  
Operating Conditions ◽  
Initial Concentration ◽  
Bed Height

The aim of this study is to use the dry fibers of date palm as low-cost biosorbent for the removal of Cd(II), and Ni(II) ions from aqueous solution by fluidized bed column. The effects of many operating conditions such as superficial velocity, static bed height, and initial concentration on the removal efficiency of metal ions were investigated. FTIR analyses clarified that hydroxyl, amine and carboxyl groups could be very effective for bio-sorption of these heavy metal ions. SEM images showed that dry fibers of date palm have a high porosity and that metal ions can be trapped and sorbed into pores. The results show that a bed height of 6 cm, velocity of 1.1Umf and initial concentration for each heavy metal ions of 50 mg/L are most feasible and give high removal efficiency. The fluidized bed reactor was modeled using ideal plug flow and this model was solved numerically by utilizing the MATLAB software for fitting the measured breakthrough results. The breakthrough curves for metal ions gave the order of bio-sorption capacity as follow: Cd(II)]Ni(II).

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