Instrumentation based on operational amplifiers (Part II)

Reilley, Charles N.

doi:10.1021/ed039pa933

Cited by 13 publications

(18 citation statements)

References 9 publications

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“…Less versatile, but relatively inexpensive short-term analog integrators using one or more operational amplifiers have been described in detail for several years (1)(2)(3)(4). A typical circuit is shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Comparative study of different methods of packaging liquid reagents

Curtis¹,

Rein²,

Yamamura³

1973

Anal. Chem.

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Figure 3. Dependence of differential pulsed stripping peak current on the reciprocal of the added uncompensated resistance Solution: 8 ppb Pb in 1.70 acetic acid/1.25F potassium acetate. Instrumental conditions: same as for Figure 1 Similar experiments of O'Dom (8) using the hanging mercury drop electrode indicate that a similar effect of uncompensated resistance obtains at this electrode, but that an added uncompensated resistance of ~50 ki2 is (8) G. O'Dom, Princeton Applied Research Corporation, Princeton, N.J., private communication, 1973. necessary for the effect to show clearly. That a higher resistance is necessary to demonstrate the effect is clearly due to the smaller area of the drop as compared with the thin film; the smaller area manifests itself in a smaller interfacial capacitance and a smaller stripping current, both of which require a larger uncompensated resistance to exhibit the effect seen at lower resistance values with the thin-film electrode.A complete theoretical and experimental study of pulse anodic stripping voltammetry is under way in our laboratory. Until results of this complete parametric study are available, we suggest that pulsed stripping voltammetry and other voltammetric techniques be used with caution in high resistance solutions. The response depends strongly on the resistance of the test solution which may not be under the analyst's control unless he adds additional supporting electrolyte to swamp the effects of the variable amount of electrolyte naturally present in his sample.

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Section: Methodsmentioning

confidence: 99%

Comparative study of different methods of packaging liquid reagents

Curtis¹,

Rein²,

Yamamura³

1973

Anal. Chem.

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“…The operational amplifier approach to electrochemical instrumentation is well suited without modification to multichannel data acquisition (26). Simultaneous application of several applied potential signals and/or simultaneous presentation of signals arising from various current components can be achieved readily with operational amplifier equipment described in the literature (6,17,22,(24)(25)(26). However, to effect readout of a large number of signals, recording equipment of corresponding capacity is required.…”

Section: Ibm Card In Voltammetric Techniquesmentioning

confidence: 99%

Instrumentation for Digital Data Acquisition in Voltammetric Techniques. D. C. And A. C. Polarography.

Brown¹,

Smith²,

DeFord³

1966

Anal. Chem.

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“…); D, Sylvania silicon diodes, Type 1N485A; S, in-phasequadrature switch; Position 1, quadrature component; Position 2, Scan Generator. The scan generator is a conventional unit in operational amplifier polarographs (2,11) and will not be described in detail.…”

Section: Description Of Instrumentmentioning

confidence: 99%

“…Difference Amplifier. This is a Philbrick Model P65 amplifier with both inputs active and is used in a conventional controlled-potential configuration (2,11) Current Amplifier. This is a Philbrick Model P45A amplifier used with the positive input grounded in the conventional configuration (2, 11).…”

Section: The Voltage Sourcementioning

confidence: 99%