Acetaldehyde

Adsorption / desorption

Administrative data

Endpoint:

adsorption / desorption: screening

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

The adsorption coefficient of acetaldehyde is not determinable with the HPLC method because 1. in the chromatogram of acetaldehyde more than one signal can be observed and it can not be decided which one belongs to monomeric acetaldehyde. A part of the acetaldehyde may oligo- or polymerise under the HPLC conditions. 2. If the signal with the shortest retention time at 2.423 min (a second measurement shows the retention time 2.455 min) is acetaldehyde, it is shorter than the retention time of thiourea (2.706 min) which defines the dead time. All substances with shorter retention times give a negative capacity factor. Therefore it is not possible to calculate log of this capacity factor or log Koc. Parameters tries to be determined according EC test guideline under GLP - guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2007

Report date:

2007

Materials and methods

Test guideline

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:

soil/sewage sludge

Test material

Test material information

Constituent 1

Reference substance name:

Acetaldehyde

EC Number:

200-836-8

EC Name:

Acetaldehyde

Cas Number:

75-07-0

Molecular formula:

C2H4O

IUPAC Name:

acetaldehyde

Details on test material:

Batch: 0000010906
Purity: 99.8 %

Radiolabelling:

no

Study design

HPLC method

Details on study design: HPLC method:

HPLC: Agilent 1100
Column: LiCrospher 100 CN 5 ¿m, L = 250 mm, ID = 4 mm, Nr. 01
Mobile phase: 5 vol.-% acetonitrile / 95 vol.-% water
pH 7
Flow rate: 1 ml/min, isocratic
Detector: DAD at 210,4 nm
Temperature: 40 °C ¿ 0.5 °C
Injection volume: 5 µl
Diluting agent: 50 % acetonitrile / 50 % water

Results and discussion

Results: HPLC method

Details on results (HPLC method):

HPLC: Agilent 1100
Column: LiCrospher 100 CN 5 ¿m, L = 250 mm, ID = 4 mm, Nr. 01
Mobile phase: 5 vol.-% acetonitrile / 95 vol.-% water, pH 7
Flow rate: 1 ml/min, isocratic
Detector: DAD at 210,4 nm
Temperature: 40 °C ¿ 0.5 °C
Injection volume: 5 µl
Diluting agent: 50 % acetonitrile / 50 % water

Any other information on results incl. tables

The adsorption coefficient of acetaldehyde is not determinable with the HPLC method because

1. in the chromatogram of acetaldehyde more than one signal can be observed and it can not be decided which one belongs to monomeric acetaldehyde. A part of the acetaldehyde may oligo- or polymerise under the HPLC conditions.

2. If the signal with the shortest retention time at 2.423 min (a second measurement shows the retention time 2.455 min) is acetaldehyde, it is shorter than the retention time of thiourea (2.706 min) which defines the dead time. All substances with shorter retention times give a negative capacity factor. Therefore it is not possible to calculate log of this capacity factor or log K_oc.