OCR Text |
Show Non-Volatile Metals, Ni and Cr (Research Performed at EPA, NC) Conclusions • Ni did not vaporize under baseline conditions, but did vaporize in the presence of chlorine. • Cr did not vaporize when entering as aqueous Cr (III) salt, even with chlorine, but did vaporize when entering as aqueous Cr (VI). • The initial form of Cr is important in determining vaporization. • Cr (VI)/Total Cr in exhaust is 1. very low (< 1%) always 2. enhanced by chlorine 3. greatly diminished by sulfur 4. independent of whether Cr (III) or Cr (VI) is initial form entering combustor. |