Amperometric flow-through wire detector: a practical design with high sensitivity

Lown, Jean A.; Koile, Ross Carlton; Johnson, Dennis C.

doi:10.1016/s0003-2670(01)84311-7

Cited by 34 publications

(9 citation statements)

References 6 publications

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“…The SHS-200 utilizes a microprocessor-controlled sample injection valve; either sample injection time or sample volume can be controlled. Amperometric detection was by a Pt-wire electrode in a narrow tubular channel as described previously (10) for which a =* 1/3 at the flow rates used here. Potentiostatic control was by the RDE-2 (Pine Instrument Co., Grove City, PA).…”

Section: Methodsmentioning

confidence: 99%

“…The type of organic solvent selected can significantly influence the magnitude of the atomic absorption signal (8). Flow injection analysis (FIA) has the general advantages of high frequency of sample analysis using microliter volume samples, simplicity, and the capability of accommodating different types of detectors (9)(10)(11). In this technique, the sample is usually introduced in the form of a plug into a moving stream (carrier) which carries it to the detector.…”

Section: Methodsmentioning

confidence: 99%

“…It is now possible to summarize the effect of variation in flow rate expected for an amperometric detector. From eq 7 for V8 « VR, we write log Ip = log /88 + log V8 + const (9) For a fixed sample volume in the absence of small fluctuations in uf (a = 1/3) d log Ip _ i d log uf 3 (10) For a fixed injection time in the absence of small fluctuations in uf (a = y3).…”

Section: Literature Citedmentioning

confidence: 99%

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Effect of variation in flow rate on amperometric detection in flow injection analysis

MacKoul¹,

Johnson²,

Schick³

1984

Anal. Chem.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Literature Citedmentioning

confidence: 99%

See 1 more Smart Citation

Effect of variation in flow rate on amperometric detection in flow injection analysis

MacKoul¹,

Johnson²,

Schick³

1984

Anal. Chem.

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“…Comparisons between the actual performance and theoretical behavior of flow cell detectors have not proven to be entirely successful and significant differences have been observed. These differences have been attributed to specdic effects of the electrode material, deviations in fluid flow, and inadequacies in the theory for the electrode current under certain operating conditions 17,231.…”

mentioning

confidence: 99%

A comparative study of the cylindrical wire, thin‐layer, and wall‐jet detector cells for the deterrnination of inorganic arsenic by ion exclusion chromatography with constant and pulsed amperometric detection

1992

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An ion chromatographic method for the separation and determination of As(II1) employing both constant and pulsed potential atnperometric detection at platinum electrodes has been compared using cylindrical wire, thin layer, and wall-jet flow cell detectors. Operational parameters such as limit of detection, linear dynamic range, stability, reproducibility, and flow rate dependence are reported for each detector cell. The different detector designs have features which make them indwidually appealing, depending on the type of application being considered and which operational parameter is most important. However, the limit of detection with the wall-jet electrode of 1 x 10-9 M is superior to the other electrode designs (this may not necessarily be the case for other analytes) and makes this the preferred method for the determination of arsenic in bottled mineral water. Additionally, a lower limit of detection is achieved with constant potential amperometric detection than is the case with pulsed potential amperometric detection, which suggests that pulsed methods may not be advantageous for the detection of species at potentials where a large background current is exhibited at very positive potentials as required for the determination of arsenic.KEY WORDS: Flow detectors, arsenic, ion chromatography. INTUODUCTTONFlow-through electrochemical detectors are among the most popular detectors used in high performance liquid chromatography or flow-injection analysis because of their selectivity, high sensitivity, and linear response over a wide concentration range [l-131. The majority of voltammetric detectors 11-101 described to date have employed liquid mercury electrodes or solid electrodes constructed from the noble metals and various forms of carbon. Solid electrode1To whom correspondence should be addressed

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“…Recent studies have indicated that solid electrodes (Pt, Au, glassy carbon) for flowing liquid generally have greater sensitivity and simpler cell design than dropping mercury electrodes (5)(6)(7)(8)(9). Anodic detection of arsenic(III) in a flow-through platinum-wire electrode for flow-injection analysis has also been reported (10,11). The arsenic(V) concentration in the sample was, however, obtained by difference after the reduction of arsenic(V) to arsenie(III) with hydrazine sulfate (11).…”

mentioning

confidence: 99%

Simultaneous determination of arsenic(III) and arsenic(V) in metallurgical processing media by ion chromatography with electrochemical and conductivity detectors

Tan¹,

Dutrizac²

1986

Anal. Chem.

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Amperometric flow-through wire detector: a practical design with high sensitivity

Cited by 34 publications

References 6 publications

Effect of variation in flow rate on amperometric detection in flow injection analysis

Effect of variation in flow rate on amperometric detection in flow injection analysis

A comparative study of the cylindrical wire, thin‐layer, and wall‐jet detector cells for the deterrnination of inorganic arsenic by ion exclusion chromatography with constant and pulsed amperometric detection

Simultaneous determination of arsenic(III) and arsenic(V) in metallurgical processing media by ion chromatography with electrochemical and conductivity detectors

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