Registration Dossier

Administrative data

Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Study period:
May 10-12 1999
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study was conducted according to an OECD Method and in accordance with GLP. The study material is well characterized.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1999
Report Date:
2000

Materials and methods

Test guideline
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))
Version / remarks:
Derived from the 08.04.1993:2. Draft Guideline for testing of Chemicals:Screening method for the determination of the Adsorption-coefficient on Soil (KOC) (HPLC Method)
GLP compliance:
yes
Type of method:
HPLC estimation method
Media:
soil

Test material

Reference
Name:
Unnamed
Type:
Constituent
Radiolabelling:
no

Study design

HPLC method

Details on study design: HPLC method:


EQUIPMENT
- Apparatus: HPLC
- Type:Chromatointegrator Mod.D-2500 (Merck-Hitchi)
- Type, material and dimension of analytical (guard) column: hypersil CPS, 250 mm * 4.6 mm id; 5um particle size
- column temperature = room (20+/- 1oC)
- flow-rate = 0.75 mL/min
- Detection system: Mod. 4200 UV/Vis (Merck-Hitchi); wavelength = 214 nm

MOBILE PHASES
- Type: methanol water
- Solutes for dissolving test and reference substances:


REFERENCE SUBSTANCES
- Identity: Thiourea, atrazine, isoproturon, triadimenol, fenamiphos, linuron, azinphos methyl

DETERMINATION OF RETENTION TIMES
- Quantity of test substance introduced in the column: 10 ug/ml
- Quantity of reference substances: 10 ug/ml
Calibration curves were developed from retention time data for formamide and reference standard solutions

REPETITIONS
- Number of determinations: duplicate

EVALUATION
- Calculation of capacity factors k: Yes- calculated from the equation k = tr-t0/t0 where tr is retention time ( min) and t0= dead time( min)
- Determination of the log Koc value: yes- with reference to the calibration curve
- mean retention time for dead time( formamide) = 4.556 (SD = 0.005)

Results and discussion

Adsorption coefficient
Type:
log Koc
Value:
< 1.5

Results: HPLC method

Details on results (HPLC method):
FILL IN WHAT YOU CAN.....

Mean retention time for dead time = 4.556

Mean retention times for references substances used for calibration: 5.34 - 7.33

- Details of fitted regression line (log k' vs. log Koc):
intercept = -0.4644
SE residuals = 0.0382
SxO: 0.1192
Qxx = 134.9645
y-mean = 0.3649
Number of values = 24
log Koc = 2 log k' = -0.7208
log Koc = 3 log k' = -0.1935
X coefficient = 0.3544
SE X-coefficient = 0.0196
R2 = 0.9368
t(95,22): 2.0739
Confidence limits = 0.25
degrees of freedom = 22

- Average retention data for test substance: 2.5

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
The adsorption coeffcient of the components of the test material have been determined to be less than 1.5.

The test substance eluted with a lower retention time than thiourea. Its log Koc value was therefore outside the limits of the method and less than 1.5.