Accession Number : ADA194307

Title :   Femptogram Level Determination of Cobalt and Chromium by Luminol Chemiluminescence Detected by a Charge Coupled Device.

Descriptive Note : Technical rept.,

Corporate Author : ARIZONA UNIV TUCSON DEPT OF CHEMISTRY

Personal Author(s) : Jalkian, Rafi D ; Denton, M B

PDF Url : ADA194307

Report Date : 04 Feb 1988

Pagination or Media Count : 5

Abstract : Recently, chemiluminescence analysis of low concentration cobalt and chromium in natural waters has enjoyed much success over the more time consuming method of flameless atomic absorption spectrometry (FAAS), which consists of sample preconcentration by solvent extraction followed by FAAS. New solid-state multichannel array detectors offer greater sensitivity and better performance in many respects over currently available photon counting photomultiplier tubes. These detectors have the potential of greatly improving low light level spectroscopic measurements. In this study, a solid-state, integrating, two-dimensional charge-coupled device (CCD) was used to measure the chemiluminescence spectra and to quantitatively determine chromium, cobalt, and hydrogen peroxide by luminol chemiluminescence. The RCA SID501EX charge-coupled device used in this study has the desirable characteristics of low readout noise, low dark current, and high quantum efficiency. This quantum efficiency is approximately 55% at the luminol chemiluminescence maximum of 425 nm. The chemiluminescence was measured using two experimental configurations. One employed a flat field polychromator, and a sample cell to obtain the spectra of luminol-peroxide-metal chemiluminescence. The very low intensity background emission spectra were also measured. The second instrumental configuration consisting of the CCD and a sample cell was employed for quantitative determinations.

Descriptors :   *CHEMILUMINESCENCE, *CHROMIUM, *COBALT, CHARGE COUPLED DEVICES, CONCENTRATION(COMPOSITION), CONFIGURATIONS, COUNTING METHODS, DARKNESS, DETECTORS, DETERMINATION, HIGH RATE, HYDRAZIDES, HYDROGEN PEROXIDE, PHOTOMULTIPLIER TUBES, PHOTONS, QUANTUM EFFICIENCY, SOLVENT EXTRACTION, SPECTRA, TWO DIMENSIONAL, WATER

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE