Browsing by Author "Wade, Adrian P"

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    Computer-controlled apparatus for automated development of continuous flow methods
    (1989) Wentzell, Peter D; Hatton, Michael J; Shiundu, Paul M; Ree, Ronald M; Wade, Adrian P
    An automated apparatus to assist in the development ofanalytical continuous flow methods is described. The system is capable of controlling and monitoring a variety ofpumps, valves, and detectors through an IBM PC-AT compatible computer. System components consist of two types ofperistaltic pumps (including a multiplepump unit), syringepumps, electrically andpneumatically actuated valves, and an assortment of spectrophotometric and electrochemical detectors. Details ofthe interface circuitry are given where appropriate. To demonstrate the utility of the system, an automatically generated response surface is presentedfor theflow injection determination of iron(II) by its reaction with 1,10-phenanthroline.
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    Spectrophotometric determination of palladium with sulfochlorophenolazorhodanine by flow injection
    (1990) Shiundu, Paul M; Wentzell, Peter D; Wade, Adrian P
    Sulfochlorophenolazorhodanine (as its sodium salt) has been used in the automated development of a sensitive flow-injection procedure for the spectrophotometric determination of palladium. The resulting method has high sample throughput, good precision, and low consumption of both sample and reagents. The optimum pH for the reaction is 5.0 and the response is constant at pH between 4.7 and 5.3. The sensitivity (calibration slope) of the procedure is 4.4 × 103 l./mole. The linear dynamic range is 0.045–30.0 μg/ml. The sample throughput is at least 120/hr. An automated procedure for optimization of analytical variables is described and a two-variable response surface for the system is given. Interference studies on 19 metal ions show that the method has good selectivity.
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    Spectrophotometric determination of peroxydisulphate with o-dianisidine by flow injection
    (1990) Shiundu, Paul M; Wade, Adrian P; Jonnalagadda, S. B
    Precise and accurate knowledge of peroxydisulfate ion concentration is critical in industrial polymer production, where it is extensively used as an activator. Its ability to oxidize in either acidic, neutral, or alkali media also makes it widely applicable in many other areas of chemistry.In this paper we present an optimized spectrophotometric flow injection method for determination of peroxydisulfate. The analyte oxidizes o-dianisidine to form a stable product which has a convenient absorbance maximum at 450 nm. This provides a simple and sensitive alternative to present methods which are more costly, tedious, or complex. Keywords: spectrophotometric method, peroxydisulphate
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    Versatile IEEE-488 data acquisition and control routines for a diode array spectrophotometer
    (1991) Shiundu, Paul M; Wade, Adrian P
    The UV-visible diode array spectrophotometer is a work-horse instrument for many laboratories. This article provides simple data acquisition and control routines in Microsoft QuickBasic for a HP-8452A diode array spectrophotometer interfaced to an IBM PC/XT/AT, or compatible, microcomputer. These allow capture of full spectra and measure absorbance at one or several wavelengths at preset time intervals. The variance in absorbance at each wavelength is available as an option.