Tetrakis(phenylmethyl)thioperoxydi(carbothioamide)

Adsorption / desorption

Administrative data

Endpoint:

adsorption / desorption: screening

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2008

Report date:

2008

Materials and methods

Test guideline

Test guideline 1

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))

Test guideline 2

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

Type of method:

HPLC estimation method

Media:

soil/sewage sludge

Test material

Test material information

Constituent 1

Reference substance name:

Tetrakis(phenylmethyl)thioperoxydi(carbothioamide)

EC Number:

404-310-0

EC Name:

Tetrakis(phenylmethyl)thioperoxydi(carbothioamide)

Cas Number:

10591-85-2

Molecular formula:

C30H28N2S4

IUPAC Name:

N,N-dibenzyl[(dibenzylcarbamothioyl)disulfanyl]carbothioamide

Details on test material:

- Name of test material (as cited in study report): Linkwell TBzTD

- Substance type: mono-constituent substance
- Physical state: solid, powder
- Analytical purity: > 99%

- Lot/batch No.: 08060902
- Expiration date of the lot/batch: June 2009
- Storage condition of test material: room temperature

Radiolabelling:

no

Study design

Test temperature:

ambient (25 °C)

HPLC method

Details on study design: HPLC method:

EQUIPMENT
- Apparatus: HPLC System HP 1100 (Agilent)
- Type, material and dimension of analytical (guard) column: Zorbax CN, 250 x 4 mm, 5 µm
- Detection system: refractometer HP 1100 (Agilent)

MOBILE PHASES
- Type: acetonitrile/water (purified) 60/40 (v/v)
- Experiments with additives carried out on separate columns: no
- Flow rate: 1.0 ml/min
- Injection volume: 20 µl
- Temperature: ambient (25 °C)


DETERMINATION OF DEAD TIME
- Method: by inert substances which are not retained by the column: urea as inert marker

REFERENCE SUBSTANCES
- Identity: Acetanilide, Monuron, Linuron; Atrazine, Fenthion, Trifluralin

DETERMINATION OF RETENTION TIMES
- Quantity of test substance introduced in the column: see Table 1
- Quantity of reference substances: see Table 1


REPETITIONS
- Number of determinations: 2

EVALUATION
- Calculation of capacity factors k': k'=(tR-t0)/t0
- Determination of the log Koc value:
Extrapolated from linearized function log Koc = f(log k' ) of the calibration data
(extrapolation was necessary because in the elution area of the test item no calibration substances with good correlation were available).

Results and discussion

Adsorption coefficient

Type:

log Koc

Value:

4.8

Temp.:

25 °C

Results: HPLC method

Details on results (HPLC method):

- Retention times of reference substances used for calibration: see Table 2
- Details of fitted regression line (log k' vs. log Koc): correlation coefficient r = 0.9814
- Graph of regression line attached: yes
- Average retention data for test substance: 9.7 min

further details see Table 2

Applicant's summary and conclusion

Validity criteria fulfilled:

yes