Conversion of a sequential inductively coupled plasma emission spectrometer into a multichannel simultaneous system using a photodiode array detector

Abstract

A monochannel plasma emission spectrometer was converted to a multichannel instrument by the introduction of a detection system based on an array of 1024 photodiodes and a low-resolution dispersion device. The new, relatively inexpensive equipment, features both the high speed typical of simultaneous instruments and the versatility of scanning systems. This paper reports on an evaluation of the modified equipment for quantitative analysis with the simultaneous determination of Al, Mn, Mg, Ca, Fe and Cu in a natural water matrix. An average relative prediction error of 2.4% was found which is the same as the error obtained with the conventional analytical method. Data acquisition with the modified instrument is up to 40 times faster.

A Linear Semi-infinite Programming Strategy for Constructing Optimal Wavelet Transforms in Multivariate Calibration Problems

“…The WT optimization technique was applied to steel spectra in the range 245−326 nm obtained with the low-resolution inductively coupled plasma-atomic emission spectrometer and methodology described elsewhere. , The XVERT algorithm was used to design M = 17 calibration mixtures with element concentrations in the following ranges: Mn: 0.4−2.0%; Mo: 0.6−4.0%; Cr: 8−28%; Ni: 4−28%; Fe: 40−88%. Model assessment was based on a test set consisting of 10 synthetic mixtures (simulating typical steel samples) plus nine reference steel samples.…”