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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption, other
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From June 13, 2016 to December 05, 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))
GLP compliance:
yes
Type of method:
HPLC estimation method
Media:
soil/sewage sludge
Details on study design: HPLC method:
- Apparatus: Agilent-1200 Series High Performance Liquid Chromatography
- Type, material and dimension of analytical (guard) column: BDS HYPERSIL Cyano Column, 5μm, 150 × 4.6 mm (Thermo)
- Detection system: Agilent-1260 Infinity Photodiode Array Detector
Type:
Koc
Remarks:
on sewage sludge
Value:
< 28.84
Type:
Koc
Remarks:
on soil
Value:
61.24

Table 1. The logarithm of adsorption coefficient (log KOC) on sewage sludge and on soil and the logarithm of capacity factor (log K′) of control article and reference article

Article name

The logarithm of adsorption coefficient (log KOC)

Retention time

(min)

Average retention time (min)

Capacity factor (K′)

The logarithm of capacity factor (log K′)

Sewage sludge

Soil

t1

t2

Control article

Formamide

3.028

3.021

3.025

NA

NA

Reference article

Acetanilide

1.52

1.26

4.924

4.931

4.928

0.629

-0.201

Atrazine

1.66

1.81

8.005

8.005

8.005

1.647

0.217

Monuron

1.46

1.99

7.660

7.664

7.662

1.533

0.186

2,5-Dichloroaniline

2.45

2.55

8.580

8.579

8.580

1.837

0.264

Benzoic acid phenylester

3.26

2.87

11.484

11.473

11.479

2.795

0.446

Fenthion

3.75

3.31

13.957

13.952

13.955

3.614

0.558

Phenanthrene

4.35

4.09

13.525

13.519

13.522

3.471

0.540

NA: Not application

Table 2. Retention time and capacity factor (K′) of test article “Everdirect SH12”

Peak

Retention time

(min)

Average retention time (min)

Average Capacity factor (K′)

The logarithm of capacity factor (log K′)

t1

t2

1

6.636

6.631

6.634

1.193

0.077

Table 3. The adsorption coefficient (KOC) on sewage sludge and on soil of test article “Everdirect SH12”

Peak

The logarithm of adsorption coefficient (log KOC)

The adsorption coefficient (KOC)

Area of peak (%)

Sewage sludgea

Soilb

Sewage sludge

Soil

1

< 1.46

1.79

< 28.84

61.24

100.0

a Calibration curve of reference article on sewage sludge: y = 0.139 × -0.024

b Calibration curve of reference article on soil: y = 0.330 × -0.513

Validity criteria fulfilled:
yes
Conclusions:
According to OECD 121 test method, the adsorption coefficients (KOC) of Everdirect SH12 on sewage sludge and on soil were < 28.84 and 61.24, respectively.
Executive summary:

This test using the procedures outlined in the SuperLab Study Plan for M62-151100089001EN which is based on the SOP for the OECD 121 (SOPE-507) and OECD 121 (OECD, 2001). The results of this OECD 121 test for Everdirect SH12 show that all validity criteria were met.The adsorption coefficients (KOC) of Everdirect SH12 on sewage sludge and on soil were < 28.84 and 61.24, respectively.

 

Description of key information

Respectively, the adsorption coefficients (KOC) of Everdirect SH12 on sewage sludge and on soil were < 28.84 and 61.24 (OECD TG 121).

Key value for chemical safety assessment

Koc at 20 °C:
28.84

Other adsorption coefficients

Type:
log Kp (solids-water in soil)
Value in L/kg:
61.24

Additional information

All of the articles were ran in duplicate and the difference of log KOC of test article between duplicate were < 0.25. In order to confirm retention times of test article had not drifted on HPLC analysis, formamide as the control article was analyze before and after the test artic. All test validity criteria were met. The adsorption coefficients (KOC) of Everdirect SH12 on sewage sludge and on soil were < 28.84 and 61.24, respectively.

[LogKoc: 1.46]