Pentasodium 4-amino-6-[[5-[(4-amino-6-chloro-1,3,5-triazin-2-yl)amino]-2-sulphonatophenyl]azo]-3-[(2,5-disulphonatophenyl)azo]-5-hydroxynaphthalene-2,7-disulphonate

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:

2014

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:

no

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))

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

HPLC estimation method

Media:

other: HPLC - column

Specific details on test material used for the study:

None

Radiolabelling:

no

Test temperature:

25 °C

Details on study design: HPLC method:

HPLC-system:
Agilent Technologies 1260 Infinity
Quaternary pump G1311B
Autosampler ALS G1367E
Column oven G1316A
Detector DAD G4212B

Column specification: EC 150/4.6 Nucleodur 100-5 CN-RP 150 x 5
Column temperature: 25 °C
Detection wavelength standard solutions: 220 nm
Detection wavelength test item: 220 nm
Mobile phase: Methanol/water (55/45 v/v)
Flow rate: 0.5 mL/min
Injection volume: 2 µL (reference items); 2 µL (test item)

Analytical monitoring:

not specified

Details on sampling:

None

Details on matrix:

None

Details on test conditions:

None

Computational methods:

None

Key result

Type:

log Koc

Value:

< 1.5

Temp.:

25 °C

Remarks on result:

other: None

Details on results (HPLC method):

The aim of this study was the determination of the adsorption coefficient of the test item FAT 40171/Y TE by high performance liquid chromatography (HPLC) method according to EC method C.19 and OECD guideline 121. The analysis was performed on an analytical column packed with a commercially available cyanopropyl solid phase containing lipophilic and polar moieties. A moderately polar stationary phase based on a silica matrix was used (Nucleodur 100-5 CN-RP). A 55/45 (v/v) methanol/ water mixture was used as mobile phase and the column temperature was 25 °C.
FAT 40171/Y TE eluted with a retention time of 1.76 min. Since this retention time is lower than the determined dead time of the HPLC, the adsorption coefficient could not be calculated and is therefore below the determination limit of the method.

Adsorption and desorption constants:

None

Recovery of test material:

None

Concentration of test substance at end of adsorption equilibration period:

None

Concentration of test substance at end of desorption equilibration period:

None

Details on results (Batch equilibrium method):

None

Statistics:

None

None

Validity criteria fulfilled:

yes

Conclusions:

The adsorption coefficient (log Koc) was found to be <1.5 at 25 °C temperature.

Executive summary:

The aim of this study was the determination of the adsorption coefficient of the test item FAT 40171/Y TE by high performance liquid chromatography (HPLC) method according to EC method C.19 and OECD guideline 121. The analysis was performed on an analytical column packed with a commercially available cyanopropyl solid phase containing lipophilic and polar moieties. A moderately polar stationary phase based on a silica matrix was used (Nucleodur 100-5 CN-RP). A 55/45 (v/v) methanol/ water mixture was used as mobile phase and the column temperature was 25 °C.

                                                                                   

FAT 40171/Y TE eluted with a retention time of 1.76 min.

The results are listed below:

Peak No.	Mean retention time of two runs [min]	Absolute deviation [min]	Mean log Kocof two runs
1	1.76	0.00	<1.5*

*: Below determination limit of the method

Description of key information

The adsorption coefficient of FAT 40171/Y was determined using high performance liquid chromatography (HPLC) method according to EC method C.19 and OECD Guideline 121.The analysis was performed on an analytical column packed with a commercially available cyanopropyl solid phase containing lipophilic and polar moieties. A moderately polar stationary phase based on a silica matrix was used (Nucleodur 100-5 CN-RP). A 55/45 (v/v) methanol/ watermixture was used as mobile phase and the column temperature was 25 °C.FAT 40171/Y eluted with a retention time of 1.76 min. As a result the mean log Koc of two runs was below the determination limit of the method and was considered to be (LogKoc) <1.5.

Key value for chemical safety assessment

Koc at 20 °C:

31.6