University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Data acquisition

Classification: Signal processing -> Data acquisition

Citations 9

"Data Acquisition Of Transient Signals In Inductively Coupled Plasma Mass Spectrometry"
Anal. Chim. Acta 2000 Volume 407, Issue 1-2 Pages 301-309
Francisco Laborda, Jesús Medrano and Juan R. Castillo

Abstract: The effect of data acquisition parameters and the characteristics of transient signals on limits of detection, accuracy and precision has been studied. From the point of view of peak detectability, long dwell times should be used to reduce baseline noise but the data acquisition frequency will be low. In order to get enough number of data points per peak, the width of the peak has been controlled by parameters affecting peak dispersion (injection volume, flow rate, connecting tubes). Due to the multielement nature of inductively coupled plasma mass spectrometry, the influence of the number of isotopes measured has also been considered. Proper quantification by means of the integration of transient signals has been achieved by acquiring a small number of points per peak (less than 10) and results have been comparable to those obtained with more data points (tens or hundreds). In practice, 71 elements have been determined by measuring 211 isotopes in transient signals obtained by injecting 560 µL at 1.2 mL min-1, with dwell times of 100 ms (three data points per peak).
Metals Mass spectrometry

"Digital Acquisition Of Signals From Electrochemical Cells By Virtual Instruments"
Rev. Chim. 2000 Volume 51, Issue 12 Pages 983-985
Vaireanu, D.I.

Abstract: A conductometric microcell with platinum electrodes connected to a processing system with injection was used for the acquisition of digital signals in form of voltage, current or frequency from an electrochemical cell. The data acquisition rate was 0.1-100 measurements/s. The advantages of the digital data collection as compared to graphic systems are related to their higher reliability in conductometric determination of solutions as a function of their concentration. The reproducibility of the experimental data is characterized by very good average standard deviation of 0.62%. (SFS)
Conductometry

"Evaluation Of A Predictive Curve-fitting Method For Processing Data From Flow Systems. 1. Flow System With A Mixing Chamber"
Anal. Chim. Acta 1993 Volume 272, Issue 1 Pages 125-134
James M. Jordan, Michael D. Love and Harry L. Pardue*

Abstract: The predictive kinetic data processing approach of Bacon and Pardue [Clin. Chem. (Winston-Salem, N. C.), 1989, 35, 360], implemented by fitting a first-order model (Pardue and Jordan, Anal. Chim. Acta, 1989, 220, 23), was evaluated with a flow system (e.g., Tyson, Ibid., 1986, 179, 131) involving tri-iodide as tracer and amperometric detection. The advantages of the described method included a tenfold reduction in the dependence of response on sample volume and a 20 to 65-fold reduction in the dependence on flow rate relative to a peak height method.
Triiodide Amperometry

"Comparative Studies On Data Collection And Data Treatment In Kinetic-based Determinations With Two Rotating Bioreactor/amperometric Detection Systems"
Anal. Chim. Acta 1993 Volume 283, Issue 2 Pages 785-793
J. J. Baeza Baeza, Kiyoshi Matsumoto and Horacio A. Mottola

Abstract: An alternative geometrical arrangement of the rotating bioreactor and the stationary Pt-ring amperometric detector was proposed for data collection with continuous-flow and continuous-flow/stopped-flow/continuous-flow modes. The ring electrode was located above the bioreactor instead of concentric to it. The determination of glucose (glucose oxidase as immobilized enzyme) was used to show that this configuration resulted in a reduction and stabilization of the background current, an increase of the rate order coefficients and better pseudo-first-order behaviour. Six kinetic-based data processing systems were also compared: (i) the initial rate measurement; (ii) integration of the signal time profile; (iii) a linear steady-state predictive approach; (iv) a non-linear steady-state predictive approach; (v) a single measurement fixed-time mode; and (vi) a multi-measurement fixed-time mode. The methods were evaluated by the determination of glucose, ethanol and pyrocatechol (details given). Method iii gave results with the least error. Methods v and vi gave similar errors indicating systematic errors unaccounted for in the model.
Glucose Amperometry

"Multi-data Treatment Applied To The Simultaneous Resolution Of Catechol-resorcinol Mixtures By Kinetic Enzymic Processes"
Talanta 1993 Volume 40, Issue 11 Pages 1601-1607
E. Gómez, A. Cladera, J. M. Estela and V. Cerda*,

Abstract: Mixtures of catechol and resorcinol were analyzed by oxidation with H2O2 and peroxidase in a stopped-flow reversed-flow injection system. The FIA manifold merged a stream of analyte solution with 0.03% H2O2 solution and 0.1 M phosphate buffer solution of pH 7 (all flow rates 0.7 ml/min). After passing through a reaction loop (0.5 m x 0.5 mm i.d.) at 35°C, the mixture was merged with a carrier stream (0.7 ml/min) of 0.1 M phosphate buffer solution of pH 7 at 35°C. A 100 µL volume of peroxidase (7.68 µg/ml) was injected into the carrier stream and after 15 s the flow was halted. The reaction was monitored from 250-550 nm at 1 reading/s. The data was processed using DARRAY and MULTI3 computer programs. The calibration graphs of initial reaction rate vs. concentration, prepared using a set of five multiple standards, were linear for 50-150 µM-catechol and 30-180 µM-resorcinol. The sampling frequency was 60/h.
Catechol Resorcinol Spectrophotometry

"A Data Acquisition System For Flow Injection Analysis"
Fenxi Shiyanshi 1988 Volume 7, Issue 1 Pages 52-54
Wang Kejun

Abstract: A data acquisition system is described that includes signal collection and amplification, analogue-to-digital conversion and data processing by use of a PC-1500 personal computer. Audible signalling of each stage completion is given. A data acquisition system is described that includes signal collection and amplification, analogue-to-digital conversion and data processing by use of a PC-1500 personal computer. Audible signalling of each stage completion is given.

"Device For Data Acquisition From Transient Signals: Kinetic Considerations"
J. Autom. Methods Manag. Chem. 1990 Volume 12, Issue 5 Pages 199-204
A. SANCHEZ SAMPEDRO, S. SAGRADO VIVES, and J. MARTINEZ CALATAYUD

Abstract: Details are given of a device constructed for acquisition and treatment of data from detectors used in flow injection and continuous-flow analysis (including HPLC). Analogue signals from the detector are digitized by a 12-bit binary dual-slope integrating analogue-to-digital converter that can handle 30 conversions. The digital data are processed by the interactive BASIC program PICOS.FIA, written for an Amstrad CPC128 computer but adaptable to other machines. The various possibilities for handling transient signals are described with reference to spectrophotometry, fluorimetry, turbidimetry, AAS and electrochemical detection. Practical examples of the normal, multi-peak and kinetic modes are outlined, and advantages over existing systems are indicated.
HPLC Turbidimetry Spectrophotometry Electrochemical analysis

"Research On The Analyses Of Data Obtained By Zone-circulating Flow Injection Analysis"
J. Flow Injection Anal. 1993 Volume 10, Issue 1 Pages 66-78
Yongsheng LI and Yoshio NARUSAWA*

Abstract: Zone-circulating FIA (multi-detection of a sample zone injected into a closed-flow system formed by connecting the two ports of a single FIA manifold) was performed on an instrument with a multi-step pump, using various flow-rates, to obtain sets of damped response curves. Identical results were obtained using different FIA instruments. The data were used to derive qualitative equations involving parameters such as the general residence time, flow rate, length and i.d. of the reaction coil, injected sample volume and dispersion coefficient. Six conclusions were obtained, which have an important bearing on FIA theory and experimentation. A detailed description of the relationship between flow-rate and the dispersion coefficient of a sample zone is presented.

"Implementation Of Flow Injection Titration Technique Based On The CAMILE Data Acquisition And Control System"
Process Control Qual. 1992 Volume 2, Issue 3 Pages 215-224
W.A. Heeschen, D.C. Greminger and E.D. Yalvac

Abstract: For the determination of strong and weak acids, a product stream is sampled by a pneumatically actuated six-port valve, and a portion (80.4 µL) is injected into a titrant stream of aqueous 0.01 M NaOH. The solution passes to a 1 mL mixing cell fitted with an ISI pH electrode connected to a Cole-Parmer pH transmitter. The equipment is connected and controlled by a CAMILE 3000 and Compaq DeskPro 386 computer running version 11 of the CAMILE software, by means of which the Savitzky-Golay algorithm is implemented for data smoothing and differentiation to detection the inflection points. The logic flow diagram of the system is presented. Calibration is effected with stable and standards modelling those in the product stream. In the titration of binary mixtures of strong and weak acids (or, with an acidic titrant stream, strong and weak bases), the pKa values should differ by at least 5 units; the strong species is titrated first.
Acids, weak Acids, strong Electrode Potentiometry