Degradation of pyridine derivatives in soil
The fate of pyridine and 25 substituted pyridines in soil (Aeric Ochraqualfs) was examined by measuring the quantity remaining and the inorganic N released as a result of degradation of the pyridine ring for a period of 64 d. Each compound was added to soil at 2 mmol kg . Compounds studied included pyridine substituted with one or two hydroxyl, carboxyl, chlorine, amine, or methyl groups. During the 64-d incubation period, extractability of pyridine derivatives with 2 M KCl + 0.01 M HCl decreased from an average of 88 +/- 8.8% to essentially 0 for all compounds except aminopyridines. From 36 to 94% of added aminopyridines was recovered after 64 d of incubation. Degradation of the majority of pyridine derivatives was confirmed by accumulation of N in amounts equivalent to 61 to 80% of the decrease in extractable pyridines at 64 d of incubation. Degradation of unsubstituted pyridines occurred within 8 d, whereas most hydroxypyridines were degraded within 32 to 64 d. Pyridinecarboxylic acids appear to be the most labile group of pyridine derivatives and were dissipated from soil in 4 to 16 d. Most chloropyridines persisted in soil and became weakly associated with some insoluble soil component. However, 4-chloropyridine degraded in 16 d. Aminopyridines resisted degradation in soil while methylpyridines were degraded in 8 to 32 d. Degradability of the compounds generally followed the order pyridine-carboxylic acids > pyridine = mono-hydroxypyridines > methylpyridines > aminopyridines and chloropyridines. This trend was consistent with previous results on biodegradability of the compounds in soil suspension cultures.
- Research Organization:
- Purdue Univ., West Lafayette, IN
- OSTI ID:
- 6047264
- Journal Information:
- J. Environ. Qual.; (United States), Vol. 14:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PYRIDINES
DECOMPOSITION
COAL GASIFICATION
LAND POLLUTION
NITROGEN
PESTICIDES
SOIL CHEMISTRY
SOILS
AZINES
CHEMICAL REACTIONS
CHEMISTRY
ELEMENTS
GASIFICATION
HETEROCYCLIC COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
POLLUTION
THERMOCHEMICAL PROCESSES
510200* - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)