“Heavy Metals”—A Meaningless Term?

Duffus, John H.

doi:10.1515/iupac.74.0076

Cited by 67 publications

(80 citation statements)

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“…Heavy metals are those metallic elements with relative atomic masses higher than iron [2]. As major pollutants they have the tendency to accumulate almost in a nonbiodegradable form in water, sediments and organisms such as fish with some toxic effects [3].…”

Section: Introductionmentioning

confidence: 99%

Determination of Heavy Metals in Fish Tissues, Water and Sediment from the Onitsha Segment of the River Niger Anambra State Nigeria

Ujah¹,

Do²,

Okpashi³

2017

J Environ Anal Toxicol

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Section: Introductionmentioning

confidence: 99%

Determination of Heavy Metals in Fish Tissues, Water and Sediment from the Onitsha Segment of the River Niger Anambra State Nigeria

Ujah¹,

Do²,

Okpashi³

2017

J Environ Anal Toxicol

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“…Concentrations of essential elements in organisms are normally homeostaticallycontrolled, with uptake from the environment regulated according to healthful demand. Effects on the organisms are noticeable when this guideline mechanism breaks down as a result of either lacking (deficiency) or additional (toxicity) metal (Duffus, 2002). Mourtaja (2008) Soegianto et al, (2010) studied the accumulation of heavy metals in marine animals collected from coastal waters of Gresik in Indonesia.…”

Section: Introductionmentioning

confidence: 99%

Untitled

Zaqoot¹,

Aish²,

Wafi³

2017

Turk. J. Fish. Aquat. Sci.

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The concentrations of manganese (Mn), copper (Cu), zinc (Zn), nickel (Ni), cobalt (Co), lead (Pb) and cadmium (Cd) in the muscles of grey mullet (Mugil cephalus) that were collected from Gaza fishing harbor and the surrounding areas were investigated in this study. Eight sampling locations were selected to conduct the study along the coast of Gaza. The samples were taken in September, November 2013 and March 2014. Heavy metals were identified and analyzed by Flame Atomic Absorption Spectrophotometer. The mean concentrations of heavy metals in soft tissues of fish were as follows: Mn:0.90 µg/g; Cu:13.15 µg/g; Zn:25.87 µg/g; Ni:1.10 µg/g; Co:0.68 µg/g; Pb:1.82 µg/g and Cd:0.27 µg/g, respectively. The highest concentrations of metals in fish tissues were found to be detected for zinc (13.56-40.43 µg/g) and the lowest were for cobalt (nd-2.93 µg/g) and cadmium (0.02-0.51 µg/g). The heavy metal concentrations in most fish samples were found to be below the acceptable limits proposed for fish by various international standards such as European Union (EU), World Health Organization (WHO), and Turkish guidelines (TFC). Therefore, it can be concluded that no risk on human health would be elevated at present from the consumption of fish collected from Gaza fishing harbor.

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“…On the basis of density, the term "heavy metal" is used for the elements that possess a density value greater than 4.5-5 g cm −3 , such as silver (Ag), arsenic (As), cadmium (Cd), copper (Cu), mercury (Hg), manganese (Mn), nickel (Ni), lead (Pb), and zinc (Zn), while metalloid is the definition of a chemical element that has properties intermediate between metals and non-metals, such as germanium(Ge), antimony (Sb), selenium (Se), tellurium (Te), polonium (Po), technetium (Tc), and astatine (At) [125].…”

Section: Heavy Metals and Metalloidsmentioning

confidence: 99%

“…The toxicity of metals and their compounds, however, largely depends on their bioavailability, that is, the mechanisms of uptake through cell membranes, intracellular distribution, and binding to cellular macromolecules [133]. In other words, the bioavailability of the metal, which depends on both biological factors and on the physicochemical properties of metallic forms (elements, their ions, and their compounds), is one of the key parameters in the assessment of the potential toxicity of metallic elements and their compounds toward organisms [125]. Metal availability is strongly dependent on environmental components, such as pH, redox and organic content, and soluble and bio-available metals.…”

Section: Heavy Metals and Metalloidsmentioning

confidence: 99%

Effects on the Photosynthetic Activity of Algae after Exposure to Various Organic and Inorganic Pollutants: Review

Petsas¹,

Vagi²

2017

Chlorophyll

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Algal studies remain necessary for risk assessment and their utility in ecotoxicology is the evaluation of lethal and sub-lethal toxic effects of potential toxicants on inhabitants of several ecosystems. Effects on algal photosynthetic apparatus caused by various chemical species have been extensively studied. The present chapter summarizes the published data concerning the toxicity of various organic and inorganic pollutants such as oils, pesticides, antifoulants and metals on photosynthesis of aquatic primary producers. Biochemical mode of action resulting in the disruption of photosynthesis depends on the chemical's nature and the characteristics of the exposed microorganism. Observed differences in response and sensitivity by different species to the same toxicant were attributed to several algal characteristics including photosynthetic capacity, pigment type, cellular lipid and protein content, and cell size. Single species bioassays either for one chemical alone or in mixture have been well reported and tolerance of both marine and freshwater water-column phytoplaktonic species has been examined. Adequate published information on multispecies tests (communities) in laboratory and field studies exists. However, risk assessment on photosynthesis of microbenthic periphyton is inadequate, though it is essential especially for hydrophobic organic molecules. Further studies are required to evaluate the adverse effects of metabolites on aquatic microalgae.

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“Heavy Metals”—A Meaningless Term?

Cited by 67 publications

References 0 publications

Determination of Heavy Metals in Fish Tissues, Water and Sediment from the Onitsha Segment of the River Niger Anambra State Nigeria

Determination of Heavy Metals in Fish Tissues, Water and Sediment from the Onitsha Segment of the River Niger Anambra State Nigeria

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Effects on the Photosynthetic Activity of Algae after Exposure to Various Organic and Inorganic Pollutants: Review

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