Výsledky vyhledávání - "James H. Weber"

Speciation of mercury in eelgrass (Zostera marina L.): a seasonal study in the Great Bay Estuary, New Hampshire

Autor: James H. Weber, Thomas S. Pannhorst

Publikováno v: Applied Organometallic Chemistry. 13:461-467

The first detailed determination of mercury(II) [Hg(II)] and monomethylmercury cation (MeHg+) concentrations in eelgrass (Zostera marina L.) is described. The rapid and simple method includes digestion by the new reagent tetrabutylammonium bromide/po

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::20e60d39153d77ad7e27185104f35c51
https://doi.org/10.1002/(sici)1099-0739(199906)13:6<461::aid-aoc867>3.0.co

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Volatile hydride and methyl compounds of selected elements formed in the marine environment

Autor: James H. Weber

Publikováno v: Marine Chemistry. 65:67-75

This review selectively describes volatile compounds of phosphorus, arsenic, sulfur, selenium, tin, lead and mercury in the marine environment with an emphasis on mercury. The discussion includes formation of volatile hydride, methyl, and mixed methy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::17d6164b3e8c840b5418b037f08019f5
https://doi.org/10.1016/s0304-4203(99)00011-0

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Seasonal study of speciation of mercury(II) and monomethylmercury in Spartina alterniflora from the Great Bay Estuary, NH

Autor: James H. Weber, Amy A. Heller

Publikováno v: The Science of The Total Environment. 221:181-188

This paper describes the first detailed determination of mercury(II) [Hg(II)] and monomethylmercury cation (MeHg+) concentrations in the salt water cord grass, Spartina alterniflora. The rapid and simple method includes digestion by the new reagent t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3be21c3be05c98ef8091e2fa6dc815e7
https://doi.org/10.1016/s0048-9697(98)00285-x

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Conversion of mercury(II) into mercury(0), monomethylmercury cation, and dimethylmercury in saltmarsh sediment slurries

Autor: Stephen H. Jones, Robert Evans, Mark E. Hines, James H. Weber

Publikováno v: Chemosphere. 36:1669-1687

This paper describes conversion of mercury(II) to elemental mercury (Hg), monomethylmercury cation (MeHg+), and dimethylmercury (Me2Hg) in slurries of saltmarsh sediments collected from April to October in 1996. Variables in these mercury conversion

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3a5c258112179b91cd436c020c951893
https://doi.org/10.1016/s0045-6535(97)10042-x

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Comparison of Digestion Media for Speciation of Mercury in the Seagrass Zostera marina L. Followed by Quantitation by Hydride Generation−Atomic Fluorescence Spectrometry

Autor: Matthew A. Morrison, James H. Weber

Publikováno v: Environmental Science & Technology. 31:3325-3329

Despite many studies of mercury speciation in marine sediments, fish, and waters, studies on the very important aquatic plants are rare. This paper describes use of the same digestion regime to compare three reagents for their ability to quantitate i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f469be1d5912f7fa230aef4e9c00cde9
https://doi.org/10.1021/es970396n

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Determination of monomethylmercury cation in sediments by vacuum distillation followed by hydride derivatization and atomic fluorescence spectrometric detection

Autor: Matthew A. Morrison, James H. Weber

Publikováno v: Applied Organometallic Chemistry. 11:761-769

This paper presents a method capable of quantitatively separating sub-nanogram amounts of monomethylmercury cation (MeHg+) and dimethylmercury from sediments by vacuum distillation at 40 °C and 6 μm Hg pressure followed by hydride derivatization an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e61747f520690b41ee788df887a0b10c
https://doi.org/10.1002/(sici)1099-0739(199710/11)11:10/11<761::aid-aoc626>3.0.co

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Speciation of methylarsenic, methyl- and butyltin, and methylmercury compounds and their inorganic analogues by hydride derivatization

Autor: James H. Weber

Publikováno v: TrAC Trends in Analytical Chemistry. 16:73-78

Derivatization by sodium borohydride converts low environmental concentrations of non-volatile, ionic analytes into volatile compounds that can be transported to and separated on chromatographic columns. This review describes hydride derivatization o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::33bbf3469c8d4f4bd4388f7650e74b32
https://doi.org/10.1016/s0165-9936(96)00085-4

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Interactions of Tin(IV) and monomethyltin cation in estuarine water-sediment slurries from the great bay estuary, New Hampshire, USA

Autor: Stephen H. Jones, Mark E. Hines, J. C. Weber, James H. Weber

Publikováno v: Applied Organometallic Chemistry. 9:581-590

This study describes experiments on sediment-estuarine water slurries originating from a Spartina alterniflora salt marsh. We investigated the fate of tin(IV) or monomethyltin cation (MeSn 3+ ) chlorides after their additon to slurries under anaerobi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4fc18d98fd87c90c60071a0f6c32096e
https://doi.org/10.1002/aoc.590090713

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Fulvic acid: modifier of metal-ion chemistry

Autor: James H. Weber, Robert A. Saar

Publikováno v: Environmental sciencetechnology. 16(9)

Fulvic acid, which is derived from the decay of plants and animals, is being studied for its role in the transport and toxicity of metal ions in soil and water. It is discussed in relation to the origin of humic substances and its interactions with m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9490c876743dbc513d3767607d829691
https://pubmed.ncbi.nlm.nih.gov/22663278

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