EPA Science Inventory

CHEMICAL MAPPING OF ELEMENTAL SULFUR ON PYRITE AND ARSENOPYRITE SURFACES USING NEAR-INFRARED RAMAN IMAGING MICROSCOPY. (R826189)

Citation:

McGuire, M. M., K. N. Jallad, D. Ben-Amotz, AND R. J. Hamers. CHEMICAL MAPPING OF ELEMENTAL SULFUR ON PYRITE AND ARSENOPYRITE SURFACES USING NEAR-INFRARED RAMAN IMAGING MICROSCOPY. (R826189). ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 178(1-4):105-115, (2001).

Description:

Abstract

Near-infrared Raman imaging microscopy (NIRIM) was used to produce chemical images of the distribution of elemental sulfur on oxidized pyrite and arsenopyrite surfaces. Analysis using Savitsky¯Golay filtering permits an unambiguous identification of surface products even in the presence of broad background signals. Rather than forming a continuous, passivating layer at the mineral surface, the NIRIM images reveal that elemental sulfur forms in isolated patches on the order of tens of microns in diameter. The potential implications of this strongly heterogeneous distribution of chemical products for geochemical modeling of acid mine drainage (AMD) are discussed.

Author Keywords: Raman imaging; Sulfide surfaces; Elemental sulfur

Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Start Date: 07/01/2001
Completion Date: 07/01/2001
Record Last Revised: 12/22/2005
Record Created: 10/30/2003
Record Released: 10/30/2003
Record ID: 68753

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL CENTER FOR ENVIRONMENTAL RESEARCH