Electrochemical Detector for Liquid Chromatography

Buchta, Raymond C.; Papa, Louis J.

doi:10.1093/chromsci/14.5.213

Cited by 41 publications

(20 citation statements)

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“…Deaeration of the mobile phase is also routinely used in high-performance liquid chromatography (HPLC) (53)(54)(55)(56)(57)(58)(59)(60)(61) because dissolved gases in an HPLC system can cause a variety of analysis problems. Experiments using HPLC with electrochemical detection (LCEC) can be improved by sample deoxygenation and mobile-phase deaeration because of the combined benefits for both HPLC and reductive electrochemical analysis when oxygen is excluded from the analytical working environment (62)(63)(64)(65)(66)(67). Spectroscopy, electrochemistry, and chromatography are the major areas of analytical chemistry in which deoxygenation plays an important role.…”

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confidence: 99%

Deoxygenation of solutions and its analytical applications

Rollie¹,

Patonay²,

Warner³

1987

Ind. Eng. Chem. Res.

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A representative survey of current methods of solution deoxygenation is presented. Some of the novel, nonconventional methods of degassing are also highlighted. The deoxygenation methodology is examined with special emphasis on luminescence spectroscopy, reductive electrochemical analysis, high-performance liquid chromatography, and liquid chromatography with reductive electrochemical detection. Each of these areas of analytical chemistry is examined with regard to (1) the adverse effects that are caused by the presence of dissolved oxygen in samples and solutions and (2) how the current deoxygenation methodology is applicable to each analytical technique.

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confidence: 99%

Deoxygenation of solutions and its analytical applications

Rollie¹,

Patonay²,

Warner³

1987

Ind. Eng. Chem. Res.

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“…Since then several other papers have been published dealing with the determination of nitro-containing thiophosphate pesticides using liquid chromatography with polarographic detection (ref. [45][46][47][48]. In the case of nitro-containing compounds, it has been demonstrated that the sensitivity of high performance liquid chromatographic methods employing a polarographic detector is comparable to such methods employing ultraviolet detection (ref.…”

Section: Organophosphorus Compoundsmentioning

confidence: 99%

Electrochemical analysis of organic pollutants

Smyth¹,

Smyth²

1987

Pure and Applied Chemistry

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“…Emphasis, however, will be placed on optimizing eluant compositions and detector cell conditions in order to achieve optimum sensitivity ('-' ppb) for various HPLC applications. Careful choice of operating potentials, or even programmed changes in detector potentials while taking chromatograms, will offer improved sensitivity and selectivity for speciation of aquatic arsenicals (59).…”

Section: Speciation Of Involatile Organoarsenicals In Aqueous Mediamentioning

confidence: 99%

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

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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,

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Electrochemical Detector for Liquid Chromatography

Cited by 41 publications

References 0 publications

Deoxygenation of solutions and its analytical applications

Deoxygenation of solutions and its analytical applications

Electrochemical analysis of organic pollutants

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

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