TOXIC SUBSTANCES FROM COAL COMBUSTION-FORMS OF OCCURRENCE ANALYSES. INCLUDES SEMIANNUAL REPORT FOR MARCH 31, 1998.

PDF Version Also Available for Download.

Description

Detailed information on trace-element modes of occurrence in coal is essential to understanding and predicting trace-element transformations taking place during coal combustion. The USGS has developed quantitative and semi-quantitative methods for determining the mode of occurrence of trace elements in coal. This information is needed to generate predictive models for trace-element behavior, the ultimate goal of this integrated study. While the USGS has a relatively small part of the overall study, the results have direct bearing on the predictive equations being developed as the primary product of this program. The USGS procedure uses an iterative selective leaching protocol on whole ... continued below

Physical Description

13 pages

Creation Information

Creator: Unknown. September 30, 1998.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Creator

  • We've been unable to identify the creator(s) of this report.

Sponsor

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

Detailed information on trace-element modes of occurrence in coal is essential to understanding and predicting trace-element transformations taking place during coal combustion. The USGS has developed quantitative and semi-quantitative methods for determining the mode of occurrence of trace elements in coal. This information is needed to generate predictive models for trace-element behavior, the ultimate goal of this integrated study. While the USGS has a relatively small part of the overall study, the results have direct bearing on the predictive equations being developed as the primary product of this program. The USGS procedure uses an iterative selective leaching protocol on whole coals in combination with a range of complementary studies. The sequence of leaching steps, and the intended results, are as follows: (1) exchangeable cations, and a fraction of the carbonate-hosted cations are removed by ammonium acetate; (2) cations primarily associated with carbonates and monosulfides such as galena, sphalerite and chalcopyrite are removed by hydrochloric acid; (3) silicate-associated cations are removed by hydrofluoric acid; and (4) elements associated with di-sulfides (pyrite and marcasite) are removed by nitric acid. The amount of an element leached by a given reagent is compared to concentrations of that element in the whole coal to obtain the fraction of an element having the indicated residence. Elements not leached by any of the four reagents may be present in the organic portions of the coal, or in insoluble phases such as zircon or titanium dioxides. Additionally, where mineral grains are completely encased by the organic matrix, these ''shielded'' grains may not be completely digested. Quantitative results are obtained by interpreting the leaching data together with the results obtained by complementary techniques such as electron microprobe analysis.

Physical Description

13 pages

Notes

OSTI as DE00008822

Source

  • Other Information: PBD: 30 Sep 1998

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Report No.: DE--FG22-95PC95145--05
  • Grant Number: AI22-95PC95145
  • DOI: 10.2172/8822 | External Link
  • Office of Scientific & Technical Information Report Number: 8822
  • Archival Resource Key: ark:/67531/metadc794508

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • September 30, 1998

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

Description Last Updated

  • April 15, 2016, 2:13 p.m.

Usage Statistics

When was this report last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 3

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

TOXIC SUBSTANCES FROM COAL COMBUSTION-FORMS OF OCCURRENCE ANALYSES. INCLUDES SEMIANNUAL REPORT FOR MARCH 31, 1998., report, September 30, 1998; Morgantown, West Virginia. (digital.library.unt.edu/ark:/67531/metadc794508/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.