Determination of mercury in estuarine sediments by flow injection-cold vapour atomic absorption spectrometry after microwave extraction

Martínez-García, M.L.; Carlosena, A.; López-Mahı́a, Purificación; Muniategui-Lorenzo, Soledad; Prada, D.

doi:10.1051/analusis:1999107

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…This technique has many significant advantages in comparison with the conventional batches procedure, as lower consumption of sample solutions and reagents, simplicity for mercury determination, high sensitivity and relative freedom from interference. 22 The peak area signals were measured and the mercury content of the samples was calculated against the mercury standard curves. All samples for this study were analyzed in three replicates.…”

Section: Mercury Determinationmentioning

confidence: 99%

Evaluation of mercury contamination in sediments from Santos - São Vicente Estuarine System, São Paulo State, Brazil

Hortellani¹,

Sarkis²,

Bonetti³

et al. 2005

J. Braz. Chem. Soc.

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A distribuição da contaminação por mercúrio no sistema estuarino de Santos -São Vicente foi observada pela análise de 31 amostras de sedimentos coletadas desse sistema, incluindo as áreas de manguezais localizadas em zonas sob influência urbana, industrial e portuária. Os valores obtidos de Hg variaram de 0,04 a 1,19 μg g -1 , sendo que cerca de 90% das amostras apresentaram concentrações superiores a 0,13 μg g -1 , limite estabelecido pela legislação Canadense e adotado pela Companhia de Tecnologia e Saneamento Ambiental de São Paulo (CETESB), abaixo do qual não é observado efeito adverso na comunidade biológica. Entre estas, cerca de 35% possui teor de Hg > 0,70 μg g -1 , provável nível de ocorrência de efeito adverso à comunidade biológica, indicando um aumento devido às atividades industriais, portuárias e urbanas. A fim de se verificar a relação entre os parâmetros investigados, foi feita análise estatística empregando-se o software SPSS-10.0. Utilizou-se o teor de lama para normalizar o de Hg, como recurso para detectar o grau de contaminação da região.The distribution of mercury contamination in the Santos -São Vicente Estuarine System was observed through the analysis of 31 sediments samples collected from that system, including mangrove areas under urban, industrial and harbor influence zones. The range of values obtained was between 0.04 and 1.19 μg g -1 . About 90% of samples presented Hg > 0.13 μg g -1 levels, which is the limit established by Canadian legislation and adopted by the environmental control agency of São Paulo State -Brazil (CETESB), below which no adverse effect on the biological community has been observed. About 35% of these samples presented concentrations of Hg > 0.70 μg g -1 , the probable level of occurrence of adverse effect on the biological community. These results indicate an increase in the mercury levels caused by industrial, port and urban activities. A statistical study was carried out, using the SPSS-10.0 software, to verify relationships among all the investigated parameters. Normalization of mercury with mud content was used to detect the degree of mercury contamination in this area.

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Section: Mercury Determinationmentioning

confidence: 99%

Evaluation of mercury contamination in sediments from Santos - São Vicente Estuarine System, São Paulo State, Brazil

Hortellani¹,

Sarkis²,

Bonetti³

et al. 2005

J. Braz. Chem. Soc.

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“…20,21 This technique is based on the chemical reduction of mercury to elemental Hg, followed by measurement of mercury vapor absorption at 253.7 nm. 18,20 The aim of this work is the development of a method for the direct determination of Hg II in ethanol fuel samples by CV-AAS without further sample pretreatment. channel peristaltic pump equipped with Tygon and polyethylene tubes that carry the sample through a reaction coil, where it is acidified and mixed with a suitable reductant.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, the most employed method for Hg determination in different matrices, such as biological tissues, water, sediments, blood, and foods, is CV-AAS, because it is a very sensitive and relatively low cost. , This technique is based on the chemical reduction of mercury to elemental Hg, followed by measurement of mercury vapor absorption at 253.7 nm. , …”

Section: Introductionmentioning

confidence: 99%

Direct Determination of Inorganic Mercury in Ethanol Fuel by Cold Vapor Atomic Absorption Spectrometry

Almeida

Coelho

2012

Energy Fuels

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A simple method for the direct determination of mercury in ethanol fuel samples diluted with water by cold vapor atomic absorption spectrometry (CV-AAS) is proposed. The chemical parameters (concentrations of NaBH 4 and HCl) used for the Hg vapor generation for its measurement by CV-AAS were optimized. The calibration curve showed a linear response over the studied range (1−25 μg L −1 ), with a correlation coefficient of 0.9999 and limits of detection and quantification of 0.05 and 0.17 μg L −1 , respectively. The relative standard deviations were lower than 3.5%. The accuracy of the method was estimated by applying the recovery test, and recovery values obtained were 84 and 106%. A sample throughput of 45 h −1 was achieved. Simplicity and sensitivity are among the advantages offered by the proposed method.

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“…12,15 Sodium chloride present in the sample matrix was reported to affect the mercury signal using CVAAS. 16 It was well reported that complete decomposition of the organic matter in plant material and others was not observed using a lowpressure closed-vessel microwave digestion system; 6,17 also organic matter present in the sample digest can affect the analytical signals of Hg by CVAAS.…”

Section: Effect Of Matrix Interferencementioning

confidence: 99%

“…[8][9][10] The total mercury in sediments and biological samples were determined using offline microwave digestion with flow-injection CVAAS. 11,12 The aim of this work was to develop a simple, rapid, sensitive and high sample throughput method for the determination of mercury in botanical and CPM samples. The developed method uses two different types of closed vessels for microwave digestion with sodium tetrahydroborate and hydroxylammonium chloride as a reductant in the final determination by CVAAS.…”

mentioning

confidence: 99%

Determination of Mercury in Chinese-Prepared Medicine Using Closed Vessel Microwave Digestion with Cold-Vapor Atomic Absorption Spectrometry

Ong¹,

Yong²,

Woo³

et al. 2000

ANAL. SCI.

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Mercury is a well-known toxic metal which was found to be 0.005 to 0.5 mg/kg for normal plant materials and 1 to 3 mg/kg in contaminated plants that were known to be toxic. 1,2 The Sale of Drugs Act in Singapore states that the amount of mercury in herbal medicine must not be greater than 0.5 mg/kg. Chineseprepared medicines (CPM) come in the form of tablets (coated and uncoated), concentrated pills, syrup, capsules, soluble granules and others. 3 In many ways, CPM were very similar to plant materials, except that different herbs are added to a single product.Methods using wet acid digestion with cold-vapor atomic absorption spectrometry (CVAAS) for the determination of mercury in food were well reported in official methods. 4,5 However, the pretreatment of samples using wet acid digestion can be rather tedious.Microwave digestion using a closed-vessel based on the coupling of electromagnetic radiation with mineral acid to produce high pressure and temperature allows the reaction less time to complete than by conventional means. 6,7 Other than for speed, closed-vessel microwave digestion also minimizes the loss of any volatile analytes, such as mercury. Methods used for the determination of mercury in crop and food samples using a closed vessel and open focused microwave digestion with CVAAS have been reported. [8][9][10] The total mercury in sediments and biological samples were determined using offline microwave digestion with flow-injection CVAAS. 11,12 The aim of this work was to develop a simple, rapid, sensitive and high sample throughput method for the determination of mercury in botanical and CPM samples. The developed method uses two different types of closed vessels for microwave digestion with sodium tetrahydroborate and hydroxylammonium chloride as a reductant in the final determination by CVAAS. The effect of undecomposed organics after closed-vessel microwave digestion and other possible matrix interferences of the method were investigated. The method was used to develop an in-house reference material for day-to-day quality-control purposes. A simple approach of using a statistical qualitycontrol (SQC) chart was proposed for monitoring the stability of an analytical procedure. ExperimentalReagents & standard reference materials High-purity concentrated nitric acid (BDH, Aristar Grade) was used for acid digestion. Deionized water from a Millipore Alpha-Q system that had the capability to produce 18 mΩ cm was used. One certified plant reference material (olive leaves, A method that is both simple and rapid for the determination of mercury in Chinese-prepared medicine (CPM) was developed. The method uses closed-vessel microwave digestion with final analysis by CVAAS with a sodium borohydride and hydroxylammonium hydrochloride solution. The accuracy of the method was checked using botanicalcertified reference materials (BCR62, olive leaves), and close agreement with certified values was achieved. The precision of the method, based on different types of CPM samples and different analysts on different da...

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Determination of mercury in estuarine sediments by flow injection-cold vapour atomic absorption spectrometry after microwave extraction

Cited by 10 publications

References 15 publications

Evaluation of mercury contamination in sediments from Santos - São Vicente Estuarine System, São Paulo State, Brazil

Evaluation of mercury contamination in sediments from Santos - São Vicente Estuarine System, São Paulo State, Brazil

Direct Determination of Inorganic Mercury in Ethanol Fuel by Cold Vapor Atomic Absorption Spectrometry

Determination of Mercury in Chinese-Prepared Medicine Using Closed Vessel Microwave Digestion with Cold-Vapor Atomic Absorption Spectrometry

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