STI571 F8

Adsorption / desorption

Administrative data

Endpoint:

adsorption / desorption, other

Remarks:

The log KOC was estimated using an atom/fragment contribution method (Software PCKOCWIN© v 1.66)

Type of information:

experimental study

Adequacy of study:

other information

Study period:

2005

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2005

Report date:

2005

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

OECD Guideline No. 121 for the testing of chemicals,
adopted on 22 January 2001

GLP compliance:

yes

Type of method:

HPLC estimation method

Media:

other: HPLC is performed on an analytical column packed with a commercially available cyanopropyl solid phase, based on a silica matrix, containing lipophilic and polar moieties.

Test material

Test material information

Constituent 1

Test material form:

solid: particulate/powder

Details on test material:

Batch number: 022401

Radiolabelling:

no

Study design

HPLC method

Details on study design: HPLC method:

System: Finnigan Surveyor
Column: Hy Purity Cyano 100*2.1 mm; Lot. No. 6142; SN 0942100X
Column temperature: 35 °C
Mobile phase: 30 % methanol (LiChrosolv, Merck Lot. No. K34906107527)
70 % buffer* pH 7.5 in water
Flow 0.55 mL/min
Injection volume: 10 μL
Detection: UV-absorption at 210 nm
Buffer pH 7.5: 20 mMol/L potassiumdihydrogencitrate in water adjusted with sodium hydroxide to pH 7.5.
The pH of the mobile phase was determined during the run with a pH-meter (InoLab pH Level 2; WTW, Germany).

The dead time t0 was determined by an unretained compound (sodium nitrate; assay > 99.5 %; Lot A474137344; Merck Germany).
According to the guidelines a minimum of six reference points, if possible at least one above and one below the expected value of the test substance should be used. Freshly prepared solutions of six reference compounds in the mobile phase were injected individually to identify their peak in this HPLC-system. Then they were injected simultaneously (before and after the test substance) and the exact retention times were determined in duplicate. The corresponding capacity factors and logarithms of the capacity factors were calculated and plotted as a function of the log KOC.
A linear regression line was calculated from the data of this graph.
The log KOC values of the reference compounds are described in the guidelines.
The test was performed with a freshly prepared solution of 4.8 mg of "STI571 F8" per litre mobile phase.
The retention time of the test substance was determined in duplicate and the capacity factor k was calculated.

Results and discussion

Adsorption coefficient

Key result

Type:

Koc

Value:

ca. 3.85

pH:

7.5

Temp.:

35 °C

Remarks on result:

other: Main determination of the adsorption coefficient of the partly dissociated base

Results: HPLC method

Details on results (HPLC method):

- Retention times of reference substances used for calibration:
- Details of fitted regression line (log k' vs. log Koc):
- Graph of regression line attached
- Average retention data for test substance:

Applicant's summary and conclusion

Validity criteria fulfilled:

not specified