2-fluoro-6-trifluoromethylpyridine

Adsorption / desorption

Link to relevant study record(s)

Reference

Endpoint:

adsorption / desorption: screening

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))

Deviations:

no

Remarks:

The study was conducted according to the draft test guideline in effect at the time of study conduct.

GLP compliance:

yes

Type of method:

HPLC estimation method

Specific details on test material used for the study:

Substance ID: F6TF
Lot #: R646899
Purity: 99.5%

Radiolabelling:

no

Test temperature:

21.1-22.3 ºC

Details on study design: HPLC method:

EQUIPMENT:
HPLC pump
Injection volume 100 µl
250 x 4.6 mm id column packed with a 5 µm CN phase
Variable wavelength UV -vis detector
Chromatography data system

MOBILE PHASES:
The mobile phase consisted of 55% methanol and 45% phosphate buffer at a flow rate of 1.0 ml/min. The phosphate buffer was comprised of 0.025 M potassium dihydrogen phosphate and 0.025 m disodium hydrogen phosphate.

DETERMINATION OF DEAD TIME:
A solution of sodium nitrate was injected in duplicate.


REFERENCE SUBSTANCES:
- Identity: acetanilide, aniline, trichlorobenzene, phenanthrene, methoxychlor, ppDDT


DETERMINATION OF RETENTION TIMES:
All the reference substances were injected, in duplicate, and the retention times determined. This is performed at least once daily so that possible changes in column performance can be allowed for.

REPETITIONS
- Number of determinations: 2

Key result

Type:

log Koc

Value:

1.7

pH:

6.59

Temp.:

21 °C

Details on results (HPLC method):

From the experimentally derived k' measurements and the literature Koc values of the reference substances a graph was plotted. The equation of the fitted regression line was determined as

log10Koc = a.log10k' + b

where a = 6.4810
b = 4.5142

The log10k' for the test substance was -0.43. Therefore, from the above equation, the estimated log10 Koc for the test substance is 1.7.

The pH of the mobile phase was 6.59 and the temperature of the room in which the HPLC work was done ranged between 21.1 and 22.3°C.

Material	Retention Time (sec) Injection 1	Retention Time (sec) Injection 2	Retention Time (sec) Mean	Derived k' Value	log k'	log Koc
Test Substance	212	212	212	0.37	-0.43	1.7
Acetanilide	208	208	208	0.35	-0.46	1.25
Aniline	212	212	212	0.37	-0.43	2.07
Trichlorobenzene	249	249	249	0.61	-0.22	3.16
Phenanthrene	326	326	326	1.11	0.044	4.09
Methoxychlor	329	329	329	1.13	0.0521	4.90
ppDDT	341	343	342	1.21	0.08	5.63
Sodium nitrate	155	155	155	N/A	N/A	N/A

Validity criteria fulfilled:

yes

Conclusions:

log Koc = 1.7

Executive summary:

The log Koc was determined by duplicate HPLC injections of reference materials and the test substance. The logKoc was estimated to be 1.7

Description of key information

logKoc = 1.7

Additional information