Chemical and physical considerations in the use of atomic absorption detectors coupled with a gas chromatograph for determination of trace organometallic gases

Parris, George E.; Blair, William R.; Brinckman, F. E.

doi:10.1021/ac50011a014

Cited by 63 publications

(20 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figures 4 and 5 compare calibration curves for organotins from both anthropogenic and environmental sources. System detection limits, 6 (95 percent confidence level) [51], for biocidal triorganotins representative of commercial pesticides in widespread use [131 are shown in figure 4. Mixtures of R 3Sn+ compounds (R = n-butyl, phenyl, cyclo-hexyl) were separated by ion exchange HPLC-GFAA [49].…”

Section: Comparison Of Analytical Results From Gc-fpd and Hplc-gfaamentioning

confidence: 99%

Ultratrace Speciation and Biogenesis of Methyltin Transport Species in Estuarine Waters

Brinckman

Jackson

Blair

et al. 1983

Trace Metals in Sea Water

Self Cite

View full text Add to dashboard Cite

Environmental tin, widely dispersed at low concentrations in waters, sediments, and biota, is now perceived to be a bioactive element susceptible to methylation and even hydridization by marine bacteria. Nonetheless, the redox cycle of tin in natural waters is poorly understood and recent advances in tin-specific molecular characterization fail to speciate Sn(II) and Sn(IV) reliably. On the other hand, such rapid developments in speciation methodology now permit growing numbers of studies of organotin distributions in aquatic systems, raising the question of the Lnatural? biogeochemical flux of methylstannanes in relation to increased anthropogenic organotin influx from industry and shipping. New methods for direct speciation of aquated or involatile organotins by liquid chromatography are compared with advances in purge-and-trap sampling of volatile or hydrophobic organotins speciated by gas chromatography. The work in our laboratory indicates that effective models for estuarine formation and transport may ultimately be developed, but that basic roadblocks to progress stem from inadequate descriptive aqueous organometallic chemistry and knowledge of critical kinetic parameters for the lifetimes of key organotin species in sea water.

show abstract

Section: Comparison Of Analytical Results From Gc-fpd and Hplc-gfaamentioning

confidence: 99%

Ultratrace Speciation and Biogenesis of Methyltin Transport Species in Estuarine Waters

Brinckman

Jackson

Blair

et al. 1983

Trace Metals in Sea Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…Our laboratory· has developed chromatographic systems (HPLC, GC) coupled with element-selective detectors for speciation of metal-containing biogenic molecules in gas or liquid phases at ultratrace (pg-ng) levels. Volatile forms of metals have been speciated by GC-AA [45,46], or by GC with a flame photometric detector made selective for the element of interest by different flame gas flows and optical interference filters [47]. Solvated forms of metals can be speciated using liquid chromatography coupled with atomic absorption [48] or epifluorescence microscope (using fluorescent ligands) [49,50] detectors.…”

Section: Element·specific Detection Imaging and Quantitationmentioning

confidence: 99%

Inorganic Materials Biotechnology: A New Industrial Measurement Challenge

Olson¹,

Brinckman²

1986

J. RES. NAT. BUR. STAN.

View full text Add to dashboard Cite

Biotechnological processing of inorganic, heavy elements has only begun to emerge as we start to understand microbial strategies and mechanisms of heavy element transformations. Chemical speciation of key, diagnostic intermediates and products of bioprocessing in gas, liquid. and cellular phases, and on surfaces, is required to understand and optimize important reactions. Recent discoveries of microorganisms in metalenriched thermal environments, and further investigations into production of exocellular metal transforming metabolites, offer exciting prospects for development of new technologies for strategic and precious materials recovery and processing.

show abstract

“…Figure 2 illustrates GC-GFAA calibration curves and detection limits for several elements known to be biomethylated, in addition to As. Operational and performance details of the GC-GFAA system are described in another paper (25). Typically, for calibration curves dilute gas mixtures of the organometal in N2 were injected directly into GC-GFAA in amounts of 0.05 to 2.0 ml.…”

Section: Nbs Organoarsenic Effortmentioning

confidence: 99%

“…Much progress has been made in the past several years permitting speciation and quantification of volatile biogenic methylmetals (9,25,32). Underlying these methods has been the typical hydrophobic behavior of such covalent analytes and the consequent partition coefficients which favor their transport from solutions of origin into adjacent atmospheres.…”

Section: Speciation Of Involatile Organoarsenicals In Aqueous Mediamentioning

confidence: 99%

See 1 more Smart Citation

Questions concerning environmental mobility of arsenic: needs for a chemical data base and means for speciation of trace organoarsenicals.

Brinckman¹,

Parris²,

Blair³

et al. 1977

Environ Health Perspect

View full text Add to dashboard Cite

Biomethylation of metals, including arsenic, apparently occurs as a global process. Health control strategies therefore depend on accurate analysis of arsenic's environmental mobility. Determining to what extent biotransformations occur and how resultant organometal(loids) are sequestered in food chains requires sophistication beyond present-day total element determinations. Rather, active molecular forms of arsenic must be speciated for each environmental compartment, and it is necessary to quantify the dynamics of arsenic's mobility. Thus, new chemical facts are needed yielding rates of methylation or demethylation of arsenic; partition coefficients of organoarsenicals between air, water, and organic phases; and arsenic redox chemistry in polar media. NBS research in this context is reviewed with examples of recent results emphasizing speciation methodology. Topic areas discussed are: the nature of aquated methylarsenic species (NMR and laser-Raman spectroscopy); transport of methylarsenicals from aqueous media (gas chromatography-graphite furnace AA detection applied to metabolic Me3As formation); and speciation of involatile organoarsenicals in aqueous media (demonstration of HPLC utilizing element-specific AA detection and appraisal of electrochemical detectors). IntroductionBiotransformations of metalloids such as arsenic have been known for years, but only in recent times has the ubiquitous biomethylation of arsenic (1) and a number of other elements, including heavy metals (2-4), become apparent as a general environmental process (5). Clearly, anthropogenic inputs in inorganic materials can and do enhance such transformations, resulting in transport of volatile or lipidsoluble pollutants. Moreover, there is evidence (6) that even higher organisms, specifically man, can invoke elimination processes which involve formation of methylarsenic compounds. Consequently,

show abstract

Chemical and physical considerations in the use of atomic absorption detectors coupled with a gas chromatograph for determination of trace organometallic gases

Cited by 63 publications

References 45 publications

Ultratrace Speciation and Biogenesis of Methyltin Transport Species in Estuarine Waters

Ultratrace Speciation and Biogenesis of Methyltin Transport Species in Estuarine Waters

Inorganic Materials Biotechnology: A New Industrial Measurement Challenge

Questions concerning environmental mobility of arsenic: needs for a chemical data base and means for speciation of trace organoarsenicals.

Contact Info

Product

Resources

About