Determination of methyl mercury in dental-unit wastewater

Stone, Mark; Cohen, Mark E.; Lian, Liang; Pang, P. C.

doi:10.1016/s0109-5641(03)00012-5

Cited by 23 publications

(16 citation statements)

References 18 publications

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“…In spite of decades of technological and regulatory efforts to reduce mercury contamination, low levels of mercury continue to be released into the environment, causing mercury concentrations in water bodies to reach values between 0.01 and 12 ng L −1 . Even at such minute concentrations, mercury represents a serious and persistent threat to public health due to its cycling, bioaccumulation and bioamplification throughout the food chain, triggering public agencies worldwide to issue fish eating guidelines, and establish stringent regulations on industrial effluents limits .…”

Section: Introductionmentioning

confidence: 99%

A Nanoselenium Sponge for Instantaneous Mercury Removal to Undetectable Levels

Ahmed

Brockgreitens

et al. 2017

Adv Funct Materials

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Selective removal of aqueous mercury to levels below 10 ng L−1 or part per trillion remains an elusive goal for public health and environmental agencies. Here, it is shown that a low‐cost nanocomposite sponge prepared by growing selenium (Se) nanomaterials on the surface and throughout the bulk of a polyurethane sponge exhibits a record breaking‐mercury ion (Hg2+) removal rate, regardless of the pH. The exposure of aqueous solutions containing 10 mg L−1–12 ng L−1 Hg2+ to the sponge for a few seconds results in clean water with undetectable mercury levels (detection limit: 0.2 ng L−1). Such performance is far below the acceptable limits in drinking water (2 µg L−1), industrial effluents (0.2 µg L−1), and the most stringent surface water quality standards (1.3 ng L−1). The sponge shows a unique preference for Hg, does not retain water nutrients, and can significantly reduce the concentration of other heavy metal pollutants. Furthermore, the sponge shows no cytotoxic effect on human cells while exhibiting strong antimicrobial properties. The high affinity of Hg for Se results in irreversible sequestration and detoxification of mercury by the sponge, confirming the suitability for landfill disposal.

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Section: Introductionmentioning

confidence: 99%

A Nanoselenium Sponge for Instantaneous Mercury Removal to Undetectable Levels

Ahmed

Brockgreitens

et al. 2017

Adv Funct Materials

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“…The tolerance limit (w/w) was defined as the concentration of the diver's ions added causing a relative error within ±3% in the true absorbance of mercury (II)-HOTT complex. The results revealed that the presence of large amounts of the following foreign ions: Ag + , Ca 2+ , NH 4 + , Li + and Mg 2+ and the anions PO 4 3− , CH 3 COO − and NO 3 − did not cause any significant change in the corrected absorbance of the Hg complex even at 1:1000 tolerable concentrations of Hg (II) to the foreign ions, respectively. The ions Co 2+ , Ni 2+ , Cd 2+ , Au 3+ , F − and Cl − at 100-fold excess to the mercury (II) ions also did not interfere.…”

Section: Interference Studymentioning

confidence: 94%

“…Mercury (0, I, II) species and are able to combine with most inorganic and organic ligands to form various complexes, e.g. HgX 4 −2 (where X = Cl, Br and I) and methyl mercury [1,2]. Mercury can accumulate in animals and plants and also enters into human body through the food chain causing damage to central nervous system [3].…”

Section: Introductionmentioning

confidence: 99%

“…Mercury can accumulate in animals and plants and also enters into human body through the food chain causing damage to central nervous system [3]. Due to the toxicological effects and potential accumulation of mercury onto human bodies and aquatic organisms, the determination of mercury (II) or organo mercury (II) has seen an upsurge of interest in the last few years [4]. According to WHO, the allowed limits of mercury in drinking water are less than 1.0 ng mL −1 [5].…”

Section: Introductionmentioning

confidence: 99%

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Part 1. Spectrophotometric determination of trace mercury (II) in dental-unit wastewater and fertilizer samples using the novel reagent 6-hydroxy-3-(2-oxoindolin-3-ylideneamino)-2-thioxo-2H-1,3-thiazin-4(3H)-one and the dual-wavelength β-correction spectrophotometry

Hamza

Bashammakh

Al-Sibaai

et al. 2010

Journal of Hazardous Materials

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“…Zahnarztpraxen sind dort eine Hauptquelle der Quecksilberbelastung in der Umwelt [240,241]. Abwässer aus Zahnarztpraxen sind deutlich höher mit Methyl-Hg belastet [242]. Werden aber die zu den einzelnen Krankheiten noch z. T. unvollständig erforschten Ergebnisse zusammenfassend betrachtet, kann jetzt schon aufgrund der aktuellen Datenlage Amalgam weder medizinisch, arbeitsmedizinisch noch ökologisch als sicheres Zahnmaterial bezeichnet werden.…”

Section: Amalgam Und Umweltunclassified

Amalgam: Eine Risikobewertung unter Berücksichtigung der neuen Literatur bis 2005

Mutter¹,

Naumann²,

Walach³

et al. 2005

Gesundheitswesen

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Amalgam, which has been in use in dentistry for 150 years, consists of 50 % elemental mercury and a mixture of silver, tin, copper and zinc. Minute amounts of mercury vapour are released continuously from amalgam. Amalgam contributes substantially to human mercury load. Mercury accumulates in some organs, particularly in the brain, where it can bind to protein more tightly than other heavy metals (e. g. lead, cadmium). Therefore, the elimination half time is assumed to be up to 1 - 18 years in the brain and bones. Mercury is assumed to be one of the most toxic non-radioactive elements. There are pointers to show that mercury vapour is more neurotoxic than methyl-mercury in fish. Review of recent literature suggests that mercury from dental amalgam may lead to nephrotoxicity, neurobehavioural changes, autoimmunity, oxidative stress, autism, skin and mucosa alterations or non-specific symptoms and complaints. The development of Alzheimer's disease or multiple sclerosis has also been linked to low-dose mercury exposure. There may be individual genetical or acquired susceptibilities for negative effects from dental amalgam. Mercury levels in the blood, urine or other biomarkers do not reflect the mercury load in critical organs. Some studies regarding dental amalgam reveal substantial methodical flaws. Removal of dental amalgam leads to permanent improvement of various chronic complaints in a relevant number of patients in various trials. Summing up, available data suggests that dental amalgam is an unsuitable material for medical, occupational and ecological reasons.

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Determination of methyl mercury in dental-unit wastewater

Cited by 23 publications

References 18 publications

A Nanoselenium Sponge for Instantaneous Mercury Removal to Undetectable Levels

A Nanoselenium Sponge for Instantaneous Mercury Removal to Undetectable Levels

Part 1. Spectrophotometric determination of trace mercury (II) in dental-unit wastewater and fertilizer samples using the novel reagent 6-hydroxy-3-(2-oxoindolin-3-ylideneamino)-2-thioxo-2H-1,3-thiazin-4(3H)-one and the dual-wavelength β-correction spectrophotometry

Amalgam: Eine Risikobewertung unter Berücksichtigung der neuen Literatur bis 2005

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