Double modulation atomic fluorescence flame spectrometry

Fowler, William K.; Knapp, D. O.; Winefordner, J. D.

doi:10.1021/ac60340a009

Cited by 31 publications

(12 citation statements)

References 13 publications

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“…In the vast majority of spectroscopic instrumental systems, amplitude modulation ("chopping", pulsing, or sinewave modulation) of a light source was used to reduce the noise and correct for some of the background. Recently, wavelength modulation has been shown to have some theoretical advantages in increasing the signal/noise (S/N) ratio (6), and in compensating for spectral interferences (7)(8)(9) and Rayleigh and Mie scatter of exciting radiation (9). In addition, wavelength modulation gives a signal consisting of all the onwavelength information; that is, the signal consists of emission plus fluorescence.…”

mentioning

confidence: 99%

Computer-controlled multielement atomic emission/fluorescence spectrometer system

Ullman¹,

Pollard²,

Boutilier³

et al. 1979

Anal. Chem.

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mentioning

confidence: 99%

Computer-controlled multielement atomic emission/fluorescence spectrometer system

Ullman¹,

Pollard²,

Boutilier³

et al. 1979

Anal. Chem.

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“…This approach has also been applied to infrared spectroscopy, [9][10][11][12] and atomic flame emission and absorption spectroscopy. [13][14][15] The application of derivative techniques to luminescence spectroscopy was first proposed in 1974 by Green and O'Haver. 16 The combination of synchronous fluorescence spectroscopy and a derivative technique provided a better sensitivity than the conventional emission spectroscopy.…”

Section: Instructionmentioning

confidence: 99%

A novel baseline-correction method for standard addition based derivative spectra and its application to quantitative analysis of benzo(a)pyrene in vegetable oil samples

Zou

et al. 2011

Analyst

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In the present work, a baseline-correction method based on peak-to-derivative baseline measurement was proposed for the elimination of complex matrix interference that was mainly caused by unknown components and/or background in the analysis of derivative spectra. This novel method was applicable particularly when the matrix interfering components showed a broad spectral band, which was common in practical analysis. The derivative baseline was established by connecting two crossing points of the spectral curves obtained with a standard addition method (SAM). The applicability and reliability of the proposed method was demonstrated through both theoretical simulation and practical application. Firstly, Gaussian bands were used to simulate 'interfering' and 'analyte' bands to investigate the effect of different parameters of interfering band on the derivative baseline. This simulation analysis verified that the accuracy of the proposed method was remarkably better than other conventional methods such as peak-to-zero, tangent, and peak-to-peak measurements. Then the above proposed baseline-correction method was applied to the determination of benzo(a)pyrene (BaP) in vegetable oil samples by second-derivative synchronous fluorescence spectroscopy. The satisfactory results were obtained by using this new method to analyze a certified reference material (coconut oil, BCR(®)-458) with a relative error of -3.2% from the certified BaP concentration. Potentially, the proposed method can be applied to various types of derivative spectra in different fields such as UV-visible absorption spectroscopy, fluorescence spectroscopy and infrared spectroscopy.

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“…The background-corrected signal is plotted as a function of time on the graphics screen with user-selected scale expansion, and the background itself is plotted with a dotted line (see Figs. [5][6][7][8][9][10]. When the five-step square-wave modulation waveform is employed, two background-corrected signals of different sensitivity are computed as an aid in extending the analytical concentration range.…”

Section: Transient Atomisation Programsmentioning

confidence: 99%

A microcomputer-controlled background correction system for atomic spectrometry

O’Haver¹,

Harnly²,

Marshall³

et al. 1985

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A novel instrument system has been designed for use in atomic spectrometry. An Apple microcomputer is used to control data acquisition and perform data processing in a single-channel spectrometer system, which may be applied to continuum-source atomic-absorption or atomic-emission measurement. Wavelength modulation, a rapid, repetitive scanning procedure, is employed to perform automatic background correction under computer control. The microcomputer programs are written in BASIC with incorporated assembly language subroutines. The system may be used in a steady-state atomisation mode (e.g., flames) or in a transient atomisation mode (e.g., electrothermal atomisers) for either absorption or emission measurement. The microcomputer program provides peak-height and peak-area data simultaneously and a procedure is available that allows the extension of the linear calibration range. Detection limits obtained using the system are comparable to previously reported values. The software organisation and operating procedures are described and illustrated using typical output signals measured by the system. Keywords : Con tin u um -source a tom ic absorption; a tom ic emission ; microcomputers; flames; background correction * Detailed information on the software described in this paper can be obtained from the authors on request.

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Double modulation atomic fluorescence flame spectrometry

Cited by 31 publications

References 13 publications

Computer-controlled multielement atomic emission/fluorescence spectrometer system

Computer-controlled multielement atomic emission/fluorescence spectrometer system

A novel baseline-correction method for standard addition based derivative spectra and its application to quantitative analysis of benzo(a)pyrene in vegetable oil samples

A microcomputer-controlled background correction system for atomic spectrometry

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