trisodium 3-[(E)-2-(4-{[4-chloro-6-({2-[(4-{[4-(ethenesulfonyl)phenyl]amino}-6-fluoro-1,3,5-triazin-2-yl)amino]propyl}amino)-1,3,5-triazin-2-yl]amino}-5-sulfonaphthalen-1-yl)diazen-1-yl]naphthalene-1,5-disulfonate

Adsorption / desorption

Link to relevant study record(s)

Reference

Endpoint:

adsorption / desorption: screening

Type of information:

experimental study

Adequacy of study:

key study

Study period:

28 June 2006 to 16 October 2006

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

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))

Deviations:

not specified

Qualifier:

according to guideline

Guideline:

EU Method C.19 (Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge Using High Performance Liquid Chromatography (HPLC))

GLP compliance:

yes (incl. QA statement)

Type of method:

HPLC estimation method

Media:

other: test via HPLC

Specific details on test material used for the study:

Identity: FAT 40826/A
Batch: TZ 5604 BOP 01/06
Purity: Content of organic part (Na-salt): approx. 78 %
Oligomers: 13 %
Main component: approx. 48 %
Appearance: Solid, orange powder
Expiration date: February 01, 2011
Storage: At room temperature at about 20 °C in a desiccator.

Radiolabelling:

no

Details on study design: HPLC method:

For the estimation of the adsorption coefficient, the HPLC-method was used. Therefore, an analytical column packed with a commercially available, cyanopropyl solid phase containing lipophilic and polar moieties was used. A moderately polar stationary phase based on a silica matrix was used. While passing through the column along with the mobile phase, the test item interacts with the stationary phase. As a result of partitioning between mobile and stationary phases, the test item is retarded. The dual composition of the stationary phase having polar and non· polar sites allows for interaction of polar and non-polar groups of a molecule in a similar way as is the case for organic matter in soil or sewage sludge matrices. This enables the relationship between the retention time on the column and the adsorption coefficient on organic matter to be established. FAT 40826/A (30.49 mg) was dissolved in methanol (100 ml) to prepare a stock solution of 304.9 µg/ml. The stock solution (1 ml) was diluted with a solvent mixture of water and methanol (45:55; v/v) to 10 ml to obtain a standard solution of 30.49 µg/ml. The pH value of the test item solution was determined to be 6.8. This test item solution was injected three times.

HPLC-Conditions:
- Apparatus:
- Varian Autosampler 9095
- Varian Pump 9012
- Varian UVNIS detector PreSlar 310
- Jones column oven 7990
- Column: LiChrospher 100 CN, particle size 5 ~m. 250 mm x 4 mm
- Pre·column: CN
- Mobile phase: Water I methanol (45:55; v/v); pH 6.7
- Detection: Test item: 254 nm Reference items: 210 nm Sodium nitrate: 210 nm
- Temperature: 25 °C
- Injection volume: 10 µL
- Flow: 1.0 ml/min
- Runtime: 20 minutes

Type:

Koc

Value:

<= 18 other: Not specified

Temp.:

25 °C

Remarks on result:

other: Other details not specified

Type:

log Koc

Value:

<= 1.25 other: Not specified

Temp.:

25 °C

Details on results (HPLC method):

The test item solution was injected three times and the reference solution was injected six times. FAT 40826/A was not retained under the chromatographic conditions cf the test and was eluted at the dead time. The Koc of FAT 40826/A was therefore determined to be lower than that one of the lowest reference item used (acetanilide). The chromatography of the test item resulted in one main peak with a well-defined and reproducible retention time. The HPLC method was therefore considered to be suitable for the purpose of the study. Based on the chromatographic data, FAT 40826/A was considered to be stable during the test procedure. The values given represent rounded values using the exact raw data. In conclusion, the log of the adsorption coefficient (Koc) of FAT 40826/A was estimated to be log Koc <1.25 which is equal to a Koc value of <18.

Transformation products:

not specified

The test item solution was injected three times and the reference solution was injected six times. FAT 40826/A was not retained under the chromatographic conditions of the test and was eluted at the dead time. The Koc of FAT 40826/A was therefore determined to be lower than that one of the lowest reference item used (acetanilide). The chromatography of the test item resulted in one main peak with a well-defined and reproducible retention time. The HPLC method was therefore considered to be suitable for the purpose of the study. Based on the chromatographic data, FAT 40826/A was considered to be stable during the test procedure.

Validity criteria fulfilled:

yes

Conclusions:

The adsorption coefficient (Koc) of FAT 40826/A was estimated using the HPLC method to be log Koc <1-25 which is equal to a Koc value of <18

Executive summary:

In GLP-compliant study, the determination of the adsorption coefficient (Koc) of FAT 40826/A was performed according to the OECD Guideline 121 and EU method C.19 using HPLC method. Using the corresponding log Koc values of the reference items from the OECD guideline, the regression coefficients were calculated. The log Koc value of the test substance was calculated from the calibration equation. In conclusion, the adsorption coefficient (Koc) of FAT 40826/A was estimated to be log Koc <1-25 which is equal to a Koc value of <18 using the HPLC method. This value indicates that FAT 40826/A will not be adsorbed by organic carbon in soil. FAT 40826/A can be classified to be of very high mobility.

Description of key information

The adsorption coefficient (Koc) of FAT 40826/A was estimated to be log Koc <1-25 which is equal to a Koc value of <18.

Key value for chemical safety assessment

Koc at 20 °C:

18

Additional information

In GLP-compliant study, the determination of the adsorption coefficient (Koc) of FAT 40826/A was performed according to the OECD Guideline 121 and EU method C.19 using HPLC method. Using the corresponding log Koc values of the reference items from the OECD guideline, the regression coefficients were calculated. The log Koc value of the test substance was calculated from the calibration equation. In conclusion, the adsorption coefficient (Koc) of FAT 40826/A was estimated to be log Koc <1-25 which is equal to a Koc value of <18 using the HPLC method. This value indicates that FAT 40826/A will not be adsorbed by organic carbon in soil. FAT 40826/A can be classified to be of very high mobility.