2-methylpyridine

Additional information on environmental fate and behaviour

Administrative data

Endpoint:

additional information on environmental fate and behaviour

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Published in peer reviewed literature, minor restrictions in design and/or reporting but otherwise adequate for assessment

Data source

Reference

Reference Type:

publication

Title:

Effects of sorption on the biodegradation of 2-methylpyridine in aqueous suspensions of reference clay minerals

Author:

O'Loughlin et al

Year:

2000

Bibliographic source:

Environmental Toxicology and Chemistry, Vol. 19, No. 9, pp. 2168–2174, 2000

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

"The effects of sorption on the bioavailability of the test substance were investigated by determining the biodegradation of the test substance by an Arthrobacter sp. in aqueous suspensions of reference clay minerals and a synthetic cation exchange resin. Adsorption the test substance on kaolinite, illite, hectorite, montmorillonite, and Dowex was determined by the batch equilibrium method." (O'Loughlin et al., 2000)

GLP compliance:

not specified

Type of study / information:

Effects of sorption on the biodegradation of 2-methylpyridine in aqueous suspensions of reference clay minerals

Test material

Test material information

Constituent 1

Reference substance name:

2-methylpyridine

EC Number:

203-643-7

EC Name:

2-methylpyridine

Cas Number:

109-06-8

Molecular formula:

C6H7N

IUPAC Name:

2-methylpyridine

Details on test material:

- Name of test material (as cited in study report): 2-methylpyridine

Results and discussion

Any other information on results incl. tables

O'Loughlin et al., 2000 conclude that:

"In general, adsorption of 2-MP was positively correlated with the cation exchange capacity of the sorbent, suggesting that sorption of 2-MP on clay minerals occurs through a cation exchange reaction via the 2-methylpyridinium ion. The biodegradation of 2-MP was most rapid in the kaolinite suspensions, followed by no clay > illite >> Dowex > hectorite/montmorillonite. With the exception of kaolinite, adsorption of 2-MP on clay minerals and Dowex reduced the rate of biodegradation. The degree of attenuation was positively correlated with the fraction of 2-MP sorbed, suggesting that sorbed 2-MP was not directly available for degradation. Desorption was not rate limiting in suspensions containing hectorite, montmorillonite, or Dowex; however, desorption may have become limiting in the kaolinite and illite suspensions. The results of this study clearly indicate that adsorption can directly affect the degradation of 2-MP in complex mineral systems."