Simultaneous Multielement and Multiline Atomic Absorption Analysis Using a Computer-Coupled Photodiode Array Spectrometer

Abstract

Development of simultaneous multielement atomic absorption analysis has been hampered by a lack of effective multichannel spectrochemical measurement systems. In this study a computer-coupled photodiode array spectrometer is applied to atomic absorption measurements. Using a multielement hollow cathode lamp source and this spectrometer system, a complete “atomic absorption spectrum” can be measured over a range of 130 Å. Both quantitative and qualitative absorption information can be simultaneously acquired for lines of several elements and several lines of one element. Results are presented for multiline atomic absorption of Cr and multielement atomic absorption of Ni and Cr, and Cr and Fe.

On the Implementation of Multielement Continuum Source Graphite Furnace Atomic Absorption Spectrometry Utilizing an Echelle/CID Detection System

“…The introduction of m ultichannel detectors such as the linear photodiode array provided a means to simplify the detection of multiple elements. 7 As the source did not provide wavelength resolution, a high-resolution spectrometer was coupled to the multichannel detector. The combination of the high resolution required and the small size of the linear array severely limited wavelength coverage and therefore the number of elements that could be simultaneously determined.…”

Determination of the ultraviolet and visible spectral response of a charge‐injectiondevice array detector

“…Wavelength selection can be made electronically instead of through the manual adjustment of slit-photomultiplier tube assemblies. Some of the camera devices that have ben applied are silicon vidicon tubes [4][5][6][7][8], silicon intensified target (SIT) tubes [9][10][11][12], image dissector (ID) tubes [8,[13][14][15], photodiode arrays (16)(17)(18)(19), and charge-coupled device (CCD) arrays [20,21 ]. In contrast to these approaches the charge-injection device has several unique features.…”

Atomic absorption spectrometry with a photodiode array spectrometer

“…In several recent reports (7)(8)(9)(10) the factors affecting the relative precision of flame atomic absorption (AA) measurements with a conventional AA spectrophotometer (a spectrophotometer having a single exit slit and utilizing a photomultiplier (PMT) detector) have been discussed for a variety of analyte species. It was shown that, in general, signal shot 1 Present address: Varían Associates, Palo Alto, CA. noise, hollow cathode lamp (HCL) flicker noise, or flame transmission noise limit the measurement precision at low absorbance (0-0.1 A), analyte absorption flicker noise dominates at moderate absorbance (0.1-1.0 A), and eventually background emission flicker and analyte emission flicker noise become limiting at high absorbance (>1.0 A).…”