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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: data is from peer reviewed journal
Justification for type of information:
data is from peer reviewed journal
Qualifier:
according to
Guideline:
other: refer principle below
Principles of method if other than guideline:
To determine Adsorption of test chemical Prussian blue on the surface of goethite at pH 4.8
GLP compliance:
not specified
Type of method:
other: spectroscopy
Media:
other: geothite
Specific details on test material used for the study:
- Name of test material: Prussian blue
- IUPAC name: C.I. Pigment Blue 27
- Molecular formula: C6FeN6.4/3Fe
- Molecular weight: 859.23 g/mol
- Smiles : [CH-](#N)[Fe+2]([CH-]#N)([CH-]#N)([CH-]#N)([CH-]#N)[CH-]#N.[CH-](#N)[Fe+2]([CH-]#N)([CH-]#N)([CH-]#N)([CH-]#N)[CH-]#N.[CH-] (#N)[Fe+2]([CH-]#N)([CH-]#N)([CH-]#N)([CH-]#N)[CH-]#N.[Fe+3].[Fe+3].[Fe+3].[Fe+3]
- InChI : 1S/18CN.7Fe/c18*1-2;;;;;;;/q18*-1;3*+2;4*+3
- Substance type: Inorganic
- Physical state: Solid powder (dark blue)
Radiolabelling:
not specified
Test temperature:
295.14 K
Key result
Type:
other:
Temp.:
295.14 K
Matrix:
Geothite
Remarks on result:
other: strong sorption on geolite
Transformation products:
not specified

Data from the IR Spectroscopic Investigations of Prussian Blue Particles Sorbed at Goethite

load

(g CN-/kg)

 

V1(CN)

cm-1

 

T1

A1

V2(CN)

 

T2

A2

10

2077

0.889

0.051

2026

0.897

0.047

 

18.9

2085

0.715

0.146

2026

0.964

0.016

 

25.6

2086

0.584

0.234

2026

0.924

0.034

 

25.7

2085

0.567

0.246

2026

0.930

0.032

 

36.7

2085

0.424

0.373

2026

0.900

0.046

 

P.b.a

2087

0.086

1.066

2026

0.737

0.133

 

Validity criteria fulfilled:
not specified
Conclusions:
The target chemical Prussian blue is strongly adsorbed to geolite. Goethite is common component of soil.
Executive summary:

The target chemical Prussian blue is hydrolyzed at higher pH values, the liberated hexacyanoferrate ions are strongly sorbed at the iron oxide hydroxides that already exist in the soil or that have just been formed by hydrolysis of the Prussian blue.

The results obtained indicate that the interaction of Prussian blue colloids and of dissolved hexacyanoferrate ions with goethite can strongly retard the transport processes of these compounds in soils. These processes help to immobilize Prussian blue in soils. Since free cyanide ions quickly form hexacyanoferrate ions with the ubiquitous iron ions of the soil, the iron ions are also responsible for trapping damped cyanides in soils. Goethite is found all over the planet, usually in the form of concretions, stalactitic formations, oolites (a form consisting of tiny round grains cemented together), reniform (kidney shapes) or botryoidal (globular, like bunches of grapes) accumulations.

The target chemical Prussian blue is strongly adsorbed to geolite. Goethite is common component of soil.

Description of key information

The target chemical Prussian blue is strongly adsorbed to geolite. Goethite is common component of soil.

Key value for chemical safety assessment

Additional information

The target chemical Prussian blue is hydrolyzed at higher pH values, the liberated hexacyanoferrate ions are strongly sorbed at the iron oxide hydroxides that already exist in the soil or that have just been formed by hydrolysis of the Prussian blue.

The results obtained indicate that the interaction of Prussian blue colloids and of dissolved hexacyanoferrate ions with goethite can strongly retard the transport processes of these compounds in soils. These processes help to immobilize Prussian blue in soils. Since free cyanide ions quickly form hexacyanoferrate ions with the ubiquitous iron ions of the soil, the iron ions are also responsible for trapping damped cyanides in soils. Goethite is found all over the planet, usually in the form of concretions, stalactitic formations, oolites (a form consisting of tiny round grains cemented together), reniform (kidney shapes) or botryoidal (globular, like bunches of grapes) accumulations.

The target chemical Prussian blue is strongly adsorbed to geolite. Goethite is common component of soil.