Fate of di-2-(ethylhexyl)phthalate in three sludge-amended New Mexico soils
Di-3-(ethylhexyl)phthalate (DEHP) is a toxic organic of concern limiting the reuse of sewage sludge on agricultural lands. The degradation, volatilization, and adsorption of DEHP-/sup 14/C were monitored in three calcareous soils from New Mexico amended or unamended with sewage sludge. Evolution of /sup 14/CO/sub 2/ was the only mechanism of loss of DEPH from these soils. No volatilization of parent compound or organic metabolites was detected. The effects of sewage sludge on DEHP degradation varied with soil, DEHP concentration, and sludge incubation time. As a result, 50% disappearance time varied from 8 to 72 d, depending on treatment interactions. After 146 d, 76 to 93% of the DEHP-/sup 14/C was evolved as CO/sub 2/. In general, DEHP persistence was reduced by previous exposure of the soil to sludge, but was increased or unaffected by fresh additions of sludge. Increasing DEHP concentration from 2 to 20 mg kg/sup -1/ soil increased DEHP persistence. Degradation of DEHP was greater in two sandy loams (Typic Haplargids and petrocalcic Paleustolls) than in a clay soil (Typic Torrifluvents). Preliminary data suggest extensive adsorption of DEHP by all soils with no effect of sewage sludge additions.
- Research Organization:
- New Mexico State Univ., Las Cruces
- OSTI ID:
- 6196918
- Journal Information:
- J. Environ. Qual.; (United States), Vol. 14:4, Issue 4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PHTHALATES
ADSORPTION
DECOMPOSITION
EVAPORATION
TOXICITY
SEWAGE SLUDGE
GROUND DISPOSAL
AGRICULTURE
CARBON 14
CARBON ISOTOPES
LOAM
NEW MEXICO
SAND
SOILS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBOXYLIC ACID SALTS
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EVEN-EVEN NUCLEI
FEDERAL REGION VI
INDUSTRY
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LIGHT NUCLEI
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PHASE TRANSFORMATIONS
RADIOISOTOPES
SEWAGE
SLUDGES
SORPTION
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WASTE DISPOSAL
WASTE MANAGEMENT
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YEARS LIVING RADIOISOTOPES
510200* - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)