University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
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Email: schalk@unf.edu
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Pump pulsations

Classification: Theory -> Pump pulsations

Citations 7

"Synchronization Of Signal Sampling With Liquid Pulsation In Systems With Peristaltic Pumps"
Anal. Chim. Acta 1981 Volume 127, Issue 1 Pages 239-243
F. Opekar and A. Trojánek

Abstract: Method and electronic circuitry are described for synchronization of analytical signal sampling with pulsation of liquid flow in systems with a peristaltic pump. The technique is illustrated for cathodic stripping voltammetry of manganese.
Manganese Voltammetry

"Effects Of Manifold Components On Peak Profiles In Flow Injection Analysis"
Anal. Chim. Acta 1989 Volume 220, Issue 1 Pages 293-297
H. Wada, Y. Sawa, M. Morimoto, T. Ishizuki and G. Nakagawa

Abstract: The effects of the types of pumps and mixing coils, and the manner of merging the streams, on peak profiles were investigated. Four reciprocating pumps, three peristaltic pumps, single and double coils with helix diameter of 0.4 to 3 cm, and two types of mixing joint were examined on the basis of the reactions of Cu(II) and Ni(II) with 5-[(sulfomethyl)amino]-2-(2-thiazolylazo)-p-toluic acid (cf. Ibid., 1986, 179, 181). When pumps yielding small pulsations and double coils with small helix diameter were used, well-defined and reproducible peaks were obtained, and the effects of mixing joints were small.

"Depulsing System For Positive Displacement Pumps"
Anal. Chem. 1977 Volume 49, Issue 13 Pages 2125-2126
Kent K. Stewart

Abstract: The construction and operation of a simple depulsing system forpositive displacement pumps are described. The system is inexpensive and can be easily assembled from commercial available parts. It is readily adaptable to different operating pressures and flow rates and is easy to clean. It has been used with chromatography and continuous flow anal. systems with flow rates of 20-500 mL/h and pressures of 5-500 psi.

"Effect Of Variation In Flow Rate On Amperometric Detection In Flow Injection Analysis"
Anal. Chem. 1984 Volume 56, Issue 3 Pages 436-439
David MacKoul, Dennis C. Johnson, and Karl G. Schick

Abstract: Equations relating to constant sample volume and constant sampling time are derived for the case of sinusoidal variation in flow rate resulting from peristaltic pumping; conditions for maximizing analytical precision are examined.
Iodide Amperometry

"Peristaltic Pumps - Fourier Transforms: A Coupling Of Interest In Continuous-flow Flame Atomic Absorption Spectrometry"
Spectrochim. Acta B 1996 Volume 51, Issue 14 Pages 1761-1768
I. López-García, M. Sánchez-Merlos, P. Viñas and M. Hernández-Córdoba*

Abstract: The modulation imposed by the peristaltic pulses is Fourier-transformed into a frequency spectrum; the amplitude observable at the known pulse frequency can then be distinguished from noise signals. The module of the signal at a frequency of nomega/60 can be used as the analytical signal to lower the limit of determination by a factor of 5-6 with respect to that obtainable by aspiration. Concentrations that are too high to be measured with direct aspiration can be measured by including an auxiliary channel in the manifold to compensate for the difference between the pumping rate and the nebulizer uptake rate and using the amplitude as the analytical signal. Only a single standard solution analyzed under different conditions is required for calibration.
Spectrophotometry

"Characteristics And Suppression Of Flow Pulsation From Peristaltic Pump"
Bunseki Kagaku 1987 Volume 36, Issue 1 Pages 54-56
Uchida, T.;Goto, K.;Iida, C.

Abstract: Characteristics of uneven liquid flow through a peristaltic pump were detected quantitatively as pressure fluctuations by using a silicon pressure sensor. The ripple was associated with the rotation of the squeezing rollers and by the periodic release of tension on a flexible tube. The effect of roller speed on ripple formation is discussed. An air damper consisting of a simple glass cylinder was used to reduce such effects.

"Pumping Techniques In Flow Injection Analysis"
Chem. Listy 1986 Volume 80, Issue 6 Pages 586-591
Fejes, J.;Melnik, S.

Abstract: A review of pumping techniques is presented, with 33 references. The elimination of flow pulsing is discussed.