Determination of mercury in rice by cold vapor atomic fluorescence spectrometry after microwave-assisted digestion

Silva, Maria José da; Paim, Ana Paula S.; Pimentel, Maria Fernanda; Cervera, M. Luisa; Guárdia, Miguel de la

doi:10.1016/j.aca.2010.04.016

Cited by 77 publications

(32 citation statements)

References 24 publications

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“…The majority of recent studies on methylation in rice paddies have examined contaminated systems (Rothenberg et al 2014), which are beyond the scope of this paper. However, methylation has been found to occur in non-contaminated rice cultivation sites around the world including Brazil (da Silva et al 2010;Batista et al 2012;Silva et al 2012), China (Rothenberg et al 2011), and Spain (da Silva et al 2013). The use of stable isotope tracers recently confirmed that MeHg produced in saturated soils is subsequently observed in the plant's rice grains (Strickman and Mitchell 2017), suggesting that the prevalence of methylation in rice paddies is a significant concern due to its potential to cause mercury poisoning directly through a common staple food source.…”

Section: Inundated Environmentsmentioning

confidence: 99%

Recent advances in the study of mercury methylation in aquatic systems

Paranjape

Hall

2017

FACETS

118

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With increasing input of neurotoxic mercury to environments as a result of anthropogenic activity, it has become imperative to examine how mercury may enter biotic systems through its methylation to bioavailable forms in aquatic environments. Recent development of stable isotope-based methods in methylation studies has enabled a better understanding of the factors controlling methylation in aquatic systems. In addition, the identification and tracking of the hgcAB gene cluster, which is necessary for methylation, has broadened the range of known methylators and methylation-conducive environments. Study of abiotic factors in methylation with new molecular methods (the use of stable isotopes and genomic methods) has helped elucidate the confounding influences of many environmental factors, as these methods enable the examination of their direct effects instead of merely correlative observations. Such developments will be helpful in the finer characterization of mercury biogeochemical cycles, which will enable better predictions of the potential effects of climate change on mercury methylation in aquatic systems and, by extension, the threat this may pose to biota.

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Section: Inundated Environmentsmentioning

confidence: 99%

Recent advances in the study of mercury methylation in aquatic systems

Paranjape

Hall

2017

FACETS

118

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“…Following acidic digestion of samples (Evans et al 2006), cold vapour atomic absorption spectrometry (CV-AAS; Torres et al, 2009;Mousavi et al, 2010;Jarzynska and Falandysz, 2011) or cold vapour atomic fluorescence spectrometry (CV-AFS; Cava-Montesinos et al, 2004;da Silva et al, 2010;Xia et al, 2010;Senila et al, 2011) has been widely used for the determination of total mercury in several food matrices. Similar limits of quantification (LOQ) may be obtained by CV-AFS (LOQ of about 2 -10 µg/kg) and CV-AAS (about 3 ng/L in water and 4 -30 µg/kg in foods).…”

Section: For Total Mercury Analysismentioning

confidence: 99%

“…The status of certification of the new reference materials can be found on the web sites of the reference material providers. Most of analytical methods published in the literature are to a certain extent in-house validated for total mercury (Cava-Montesinos et al, 2004;Carbonell et al, 2009;Nardi et al, 2009;Torres et al, 2009;da Silva et al, 2010;Xia et al, 2010;Jarzynska and Falandysz, 2011;Millour et al, 2011a;Senila et al, 2011;Djedjibegovic et al, 2012) and methylmercury (Landaluze et al, 2004;Abrankó et al, 2007;Diez and Bayona 2008;Hippler et al, 2009;Jackson et al, 2009;Clémens et al, 2011;Guzman-Mar et al, 2011;He et al, 2011;Nevado et al, 2011). Two fully validated, European standardised methods for determination of total mercury by CV-AAS and ICP-MS detection are available (CEN, 2003(CEN, , 2010.…”

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confidence: 99%

Scientific Opinion on the risk for public health related to the presence of mercury and methylmercury in food

2012

EFS2

450

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EFSA was asked by the European Commission to consider new developments regarding inorganic mercury and methylmercury toxicity and evaluate whether the Joint FAO/WHO Expert Committee on Food Additives (JECFA) provisional tolerable weekly intakes for methylmercury of 1.6 µg/kg body weight (b.w.) and of 4 µg/kg b.w. for inorganic mercury were still appropriate. In line with JECFA, the CONTAM Panel established a tolerable weekly intake (TWI) for inorganic mercury of 4 µg/kg b.w., expressed as mercury. For methylmercury, new developments in epidemiological studies from the Seychelles Child Developmental Study Nutrition Cohort have indicated that n-3 long-chain polyunsaturated fatty acids in fish may counteract negative effects from methylmercury exposure. Together with the information that beneficial nutrients in fish may have confounded previous adverse outcomes in child cohort studies from the Faroe Islands, the Panel established a TWI for methylmercury of 1.3 µg/kg b.w., expressed as mercury. The mean dietary exposure across age groups does not exceed the TWI for methylmercury, with the exception of toddlers and other children in some surveys. The 95 th percentile dietary exposure is close to or above the TWI for all age groups. High fish consumers, which might include pregnant women, may exceed the TWI by up to approximately six-fold. Unborn children constitute the most vulnerable group. Biomonitoring data from blood and hair indicate that methylmercury exposure is generally below the TWI in Europe, but higher levels are also observed. Exposure to methylmercury above the TWI is of concern. If measures to reduce methylmercury exposure are considered, the potential beneficial effects of fish consumption should also be taken into account. Dietary inorganic mercury exposure in Europe does not exceed the TWI, but inhalation exposure of elemental mercury from dental amalgam is likely to increase the internal inorganic mercury exposure; thus the TWI might be exceeded. This opinion focuses only on the risks related to dietary inorganic mercury and methylmercury exposure and does not assess the nutritional benefits linked to certain foods (e.g. fish and other seafood).A call for annual collection of chemical contaminant occurrence data in food and feed, including mercury, was issued by EFSA in December 2010. In response, EFSA received 59 820 results on mercury in food from 20 European countries, mainly covering the period from 2004 to 2011. A total number of 59 650 results were described with sufficient detail to be used in the statistical analysis of the respective food groups; 98.2 % of the samples were for total mercury, 1.8 % for methylmercury and three samples for inorganic mercury.All the 20 food groups available at the first level of FoodEx were covered in the current data collection. The food groups 'Fish and other seafood' and 'Meat and meat products' dominated the food product coverage with 36.8 % and 17.6 % respectively. These were followed by 'Grain and grain-based products' at 7.8 % and 'Vegetables an...

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“…4,5 Therefore, it is important to develop a rapid, highly sensitive and selective detection method of Hg 2+ that can provide real-time information of mercury levels in the environment. Towards this goal, different methods for the detection of Hg 2+ have been developed in the past, including cold vapor atomic absorption spectrometry (CVAAS), 6,7 cold vapor atomic fluorescence spectrometry, 8 inductively coupled plasma mass spectrometry (ICP-MS), 9 chromophores, [10][11][12] perylenebisimide fluorophore, [13][14][15] and sensors based on semiconductor quantum dots, 16 proteins 17 and polymer materials. 18,19 New sensors based on chips, 20 single-walled carbon nanotubes 21 and nanoparticles 22,23 have also been applied for the detection of Hg 2+ .…”

Section: Introductionmentioning

confidence: 99%