scholarly journals Thinking About the Role (Largely Ignored) of Heavy Metals in Cancer Prevention: Hexavalent Chromium and Melanoma as a Case in Point

2010 ◽  
pp. 65-74 ◽  
Author(s):  
Frank L. Meyskens ◽  
Sun Yang
Keyword(s):  
Heavy Metals ◽  
Cancer Prevention ◽  
Hexavalent Chromium

scholarly journals TINGKAT BIOKONSENTRASI LOGAM BERAT DAN GAMBARAN HISTOPATOLOGI IKAN MUJAIR (Oreochromis Mossambicus) YANG HIDUP DI PERAIRAN TUKAD BADUNG KOTA DENPASAR

2015 ◽  
Vol 9 (1) ◽  
pp. 25
Author(s):  
Made Rahayu Kusumadewi ◽  
I Wayan Budiarsa Suyasa ◽  
I Ketut Berata
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Hexavalent Chromium ◽  
Metal Contamination ◽  
Heavy Metal Contamination ◽  
Quality Standards ◽  
Oreochromis Mossambicus ◽  
Metal Exposure ◽  
Histopathological Changes ◽  
Food Ingredient

Tukad Badung River is one of the potential contamination of heavy metal sare very highin the city of Denpasar. Tilapia (Oreochromis mossambicus) isa commonspecies of fish found in the river and became the object of fishing by the public. The fish is usually consume das a food ingredient forever yangler. Fish can be used as bio-indicators of chemical contamination in the aquatic environment. Determination of heavy metal bioconcentration and analysis of liver histopathology gills organs and muscles is performed to determine the content of heavy metals Pb, Cd, and Cr+6, and the influence of heavy metal exposure to changes in organ histopathology Tilapia that live in Tukad Badung. In this observational study examined the levels of heavy metal contamination include Pb, Cd and Cr+6 in Tilapia meat with AAS method (Atomic Absorption Spectrofotometric), and observe the histopathological changes in organ preparations gills, liver, and muscle were stained with HE staining (hematoxylin eosin). Low Pb content of the fish that live in Tukad Badung 0.8385 mg/kg and high of 20.2600 mg/kg. The content of heavy metals Pb is above the quality standards specified in ISO 7378 : 2009 in the amount of 0.3 mg / kg. The content of Cr+6 low of 1.1402 mg / kg and the highest Cr+6 is 6.2214 mg / kg. The content of Cr+6 is above the quality standards established in the FAO Fish Circular 764 is equal to 1.0 mg / kg. In fish with Pb bioconcentration of 0.8385 mg / kg and Cr+6 of 1.1402 mg / kg was found that histopathological changes gill hyperplasia and fusion, the liver was found degeneration, necrosis, and fibrosis, and in muscle atrophy found. Histopathologicalchangessuch asedema and necrosis ofthe liveris foundin fishwith Pb bioconcentration of 4.5225mg/kg and Cr+6 amounted to2.5163mg/kg. Bio concentration of heavy metal contamination of lead (Pb) and hexavalent chromium (Cr+6) on Tilapia ( Oreochromis mossambicus ) who lives in Tukad Badung river waters exceed the applicable standard. Histopathological changes occur in organs gills, liver, and muscle as a result of exposure to heavy metals lead and hexavalent chromium. Advised the people not to eat Tilapia that live in Tukad Badung

scholarly journals Positive effects of concomitant heavy metals and their reduzates on hexavalent chromium removal in microbial fuel cells

RSC Advances ◽  
2020 ◽  
Vol 10 (26) ◽  
pp. 15107-15115 ◽  
Author(s):  
Xiayuan Wu ◽  
Chunrui Li ◽  
Zuopeng Lv ◽  
Xiaowei Zhou ◽  
Zixuan Chen ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Fuel Cells ◽  
Hexavalent Chromium ◽  
Microbial Fuel Cells ◽  
Chromium Removal ◽  
Positive Effects ◽  
Bioelectricity Generation ◽  
Co Reduction

The cooperative cathode modification by BioAu from Au(iii) and in situ Cu(ii) co-reduction enhanced Cr(vi) removal and bioelectricity generation in MFCs.

scholarly journals The Effect of Some Soil Amendments (Manure and Biochar) on the Bioaccumulation Capacity of Hexavalent Chromium by Two Species of (Salicornia Persica) and (Salicornia Perspolitana) From Contaminated Soil

2021 ◽  
Author(s):  
Fahime Ashrafi ◽  
Ava heidari ◽  
Mohammad Farzam ◽  
Alireza Karimi ◽  
Malihe Amini
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Organic Compounds ◽  
Hexavalent Chromium ◽  
Photosynthetic Pigments ◽  
Dry Weight ◽  
Manure Treatment ◽  
Chromium Accumulation ◽  
Manure Amendments ◽  
Experimental Treatments

Abstract Heavy metals are among the most dangerous contaminants in the environment. Application of organic compounds and plant species with the ability to accumulate and stabilize heavy metal in their organs is the best option for remediation of these elements in the soil. Therefore, this study aimed to investigate the effects of manure and biochar on the accumulation of heavy metals by Salicornia species. Two species of Salicornia ,including S. persica and S. perspolitana, were cultivated outdoor in experimental pots. The effects of experimental treatments ,including hexavalent chromium concentrations, manure ,and biochar on the two studied species, were investigated. The results indicated a significant effect (P < 0.05) of biochar on the accumulation of heavy metals by two species ,S. persicaand S. perspolitana, so that chromium concentrations in the roots and shoots were 258 and 5.41 mg/kg, respectively. Also, chromium accumulations under manure treatments in the roots and shoots were 334.34 and 9.79 mg/kg, respectively. Plant dry weight and height for both species in manure treatment were higher than control and biochar treatments. S. persica showed higher growth than S. perspolitana species. The content of photosynthetic pigments in both S.persica and S. perspolitana species under biochar treatment was higher than control and manure treatments. In general, one can conclude that the accumulation of chromium in S. perspolitana was higher than in S. persica ,and the application of biochar and manure amendments could stabilize chromium in soil and reduce chromium accumulation in both S. persica and S. perspolitana species.

Hexavalent chromium removal by using synthesis of polyaniline and polyvinyl alcohol

2016 ◽  
Vol 74 (10) ◽  
pp. 2305-2313 ◽  
Author(s):  
Majid Riahi Samani ◽  
Parisa Ebrahimbabaie ◽  
Hamed Vafaei Molamahmood
Keyword(s):  
Heavy Metals ◽  
Polyvinyl Alcohol ◽  
Hexavalent Chromium ◽  
Removal Efficiency ◽  
Chromium Concentration ◽  
Chromium Removal ◽  
Chromium Vi ◽  
Pani Composite ◽  
Stirring Time ◽  
Textile Finishing

Over the past few years, heavy metals have been proved to be one of the most important contaminants in industrial wastewater. Chromium is one of these heavy metals, which is being utilized in several industries such as textile, finishing and leather industries. Since hexavalent chromium is highly toxic to human health, removal of it from the wastewater is essential for human safety. One of the techniques for removing chromium (VI) is the use of different adsorbents such as polyaniline. In this study, composites of polyaniline (PANi) were synthesized with various amounts of polyvinyl alcohol (PVA). The results showed that PANi/PVA removed around 76% of chromium at a pH of 6.5; the PVA has altered the morphology of the composites and increased the removal efficiency. Additionally, synthesis of 20 mg/L of PVA by PANi composite showed the best removal efficiency, and the optimal stirring time was calculated as 30 minutes. Moreover, the chromium removal efficiency was increased by decreasing the pH, initial chromium concentration and increasing stirring time.

Electro-migration of heavy metals in an aged electroplating contaminated soil affected by the coexisting hexavalent chromium

Chemosphere ◽  
2012 ◽  
Vol 86 (8) ◽  
pp. 809-816 ◽  
Author(s):  
Weihua Zhang ◽  
Luwen Zhuang ◽  
Lizhi Tong ◽  
Irene M.C. Lo ◽  
Rongliang Qiu
Keyword(s):  
Heavy Metals ◽  
Hexavalent Chromium ◽  
Contaminated Soil

scholarly journals Fate and Management of Pollution of Hexavalent Chromium Cr(VI) and Heavy Metals in the Zarqa River Basin in Jordan

2022 ◽  
Vol 23 (2) ◽  
pp. 108-115
Author(s):  
Maisa'a Shammout ◽  
Muhammad Shatanawi ◽  
Akl Awwad
Keyword(s):  
Heavy Metals ◽  
River Basin ◽  
Hexavalent Chromium ◽  
Zarqa River

scholarly journals Removal of Nitrate and Hexavalent Chromium from Groundwater Using Zerovalent Iron – A Laboratory Study

2010 ◽  
Vol 67 (2) ◽  
Author(s):  
Cristina MODROGAN ◽  
Alexandra MIRON ◽  
Oanamari ORBULET ◽  
Cristina COSTACHE
Keyword(s):  
Heavy Metals ◽  
Groundwater Contamination ◽  
Human Health ◽  
Hexavalent Chromium ◽  
Removal Efficiency ◽  
Laboratory Study ◽  
Nitrate Reduction ◽  
Laboratory Experiments ◽  
Zerovalent Iron ◽  
Inorganic Pollutants

. Groundwater contamination by inorganic pollutants such as heavy metals, chromium and nitrate has recently begun to attract widespread interests because of significant threat to human health. Nitrate and chromate are most frequently detected contaminants in groundwater. In this paper, we describe a series of laboratory experiments which quantify the rate of chromium (Cr6+) and nitrate reduction by Fe0. The main goal of these experiments was to determine the removal efficiency of chromium (Cr6+) and nitrate ions using iron. The results indicate that in the presence of zero valence iron Cr6+ reduces to Cr3+, and NO3- to NH4+.

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