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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The adsorption coefficient of the test item was log Koc = 2.85

Key value for chemical safety assessment

Koc at 20 °C:
707.95

Additional information

The adsorption coefficient of the test item was determined according to the HPLC method described in guideline 67/548 EEC, annex C.19.

The adsorption coefficient of the test item was found to be: 2.85

Indigo suspension adsorbs to 88% to 97% to activated sludge of sewage treatment plants. It is therefore effectively eliminated by sewage treatment plants.

Table Adsorption if Indigo to activated sludge

 

Indigo concentration in suspension [mg/L]

Extinction of Indigo suspension prior to adding activated sludge

Extinction of Indigo suspension after treatment

Adsorption to activated sludge [%]

114

0.423

0.052

88

285

1.056

0.040

96

570

2.112

0.060

97

[LogKoc: 2.85]