Leachability of retorted oil shale by strong complexometric agents. [Sodium citrates, diethylenetriaminepentaacetic acid and ethylenediaminetetraacetic acid]

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6207475

Esmaili, E; Carroll, R B

Extraction of solid waste materials with complexometric agents may offer a quick and effective method for assessing the potential long-term release of hazardous chemical constituents. Complexometric agent extraction may establish the maximum amount of elements of environmental concern that can be released to the environment and the capability of waste materials to release them. In this study, four samples of directly (DH) and indirectly (IH) retorted oil shales were extracted with deionized-distilled water and strong complexometric agents. The complexometric agent solutions were composed of 0.5M sodium citrate (citrate), 0.05M diethylenetriaminepentaacetic acid (DTPA), and 0.05M ethylenediaminetetraacetic acid (EDTA). The water extracts were very alkaline with pH values ranging from 11.0 to 11.8 for IH extracts and 12.2 to 12.8 for DH extracts. Sodium, chloride, sulfate, and fluoride were the predominant dissolved species in the IH water extracts. The DH water extracts contained mainly sodium, calcium, chloride, potassium, and sulfate. Water-extractable minor and trace elements were aluminum, arsenic, boron, barium, lithium, magnesium, molybdenum, silicon, and strontium. Complexometric extraction released detectable amounts of arsenic, antimony, selenium, lead, vanadium, and zinc. Other elements of environmental concern, including silver, cobalt, chromium, and nickel, were not detected in excess of the limits of quantitation in complexometric extracts. Based upon the analytical results, it was found that the retorted oil shale mineralogy influenced the extracting solution composition, i.e., when comparing the leachates from the IH and DH samples. Also, the complexometric agents hastened the release of certain constituents into solution compared to water extracts. 17 refs., 12 figs., 20 tabs.

• Research Organization: Western Research Inst., Laramie, WY (USA)
• DOE Contract Number: FC21-83FE60177
• OSTI ID: 6207475
• Report Number(s): DOE/FE/60177-2410; ON: DE87014160
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040500 -- Oil Shales & Tar Sands-- Properties & Composition
040900* -- Oil Shales & Tar Sands-- Waste management
041000 -- Oil Shales & Tar Sands-- Environmental Aspects
ALKALI METAL COMPOUNDS
ALKALI METALS
ALKALINE EARTH METALS
ALUMINIUM
AMINO ACIDS
ARSENIC
BARIUM
BORON
CALCIUM
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CHELATING AGENTS
CHEMICAL COMPOSITION
CITRATES
COMPLEXOMETRY
COPPER
DATA
DISPERSIONS
EDTA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EXPERIMENTAL DATA
EXTRACTION
FLUORINE
HALOGENS
HYDROGEN COMPOUNDS
INFORMATION
IRON
LEACHATES
LEAD
LITHIUM
MAGNESIUM
MANGANESE
METALS
MINERALOGY
MIXTURES
MOLYBDENUM
NONMETALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PHYSICAL PROPERTIES
REAGENTS
SELENIUM
SEMIMETALS
SEPARATION PROCESSES
SILICON
SODIUM COMPOUNDS
SOLUTIONS
SOLVENT EXTRACTION
SPENT SHALES
STRONTIUM
TRANSITION ELEMENTS
VANADIUM
WATER
ZINC