Mining Surveillance Target Investigation. Vanadium.
NIOSH 1984 Nov:28 pages
A mining surveillance target investigation of vanadium (7440622) was conducted. The purpose of the study was to characterize the surface oxidation states of vanadium in ore samples. Thirteen bulk samples obtained from vanadium or uranium mines and mills were analyzed by inductively coupled plasma atomic emission spectrometry (AES) to determine possible metal interferences and bulk composition. The samples contained up to 8 to 9 percent vanadium and were free of metal interferences. After AES, three samples were investigated by electron spectroscopy for chemical analysis (ESCA) to determine surface oxidation states of vanadium. ESCA determined oxidation states by measuring chemical shifts in observed spectra. The chemical shifts occurred due to changes in the core binding energies and were related to changes in the oxidation state. The chemical shifts of the three samples indicated that the vanadium existed as vanadium(V)-oxide (1314621), a plus 5 oxidation state. The author notes that one sample was expected to be vanadium(V)-oxide. The other two, however, were expected to have lower oxidation states. Samples containing vanadium in oxidation states below plus 5 may be unstable. Additional research on sampling and analysis of vanadium minerals and compounds is recommended.
NIOSH-Author; Toxicology; X-ray-diagnosis; Airborne-dusts; X-ray-equipment; Environmental-exposure; Environmental-contamination; Trace-metals; Emission-sources; Trace-substances;
NTIS Accession No.
Division of Respiratory Disease Studies, NIOSH, U.S. Department of Health and Human Services, 28 pages, 17 references