Aluminium lanthanum trioxide

Adsorption / desorption

Administrative data

Endpoint:

adsorption / desorption, other

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

Kd-values are based on reliable field data of concentration levels in pore water and sediment of rivers, which were highly exposed to untreated wastewater; no standard guideline test was conducted to generate Kd-values. Kd-values are calculated based on the hypothesis that equilibrium exists between the baseline levels in pore water and in sediment. LOD/LOQ were determined for each element, but values are not shown.

Data source

Reference

Reference Type:

publication

Title:

Content, distribution and fate of 33 elements in sediments of rivers receiving wastewater in Hanoi, Vietnam

Author:

Marcussen, H. et al.

Year:

2008

Bibliographic source:

Environ. Pollut. 155, 41-51

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

Determination of the content and the distribution of 33 elements, including aluminium, in the sediment and pore water of the main wastewater receiving rivers in Hanoi, Vietnam. Distribution coefficients (log10 Kd) were calculated as the ratio between sediment and pore water concentrations of aluminium.

GLP compliance:

no

Type of method:

other: field data of aluminium levels in pore water and sediment

Test material

Test material information

Constituent 1

Reference substance name:

Aluminium

EC Number:

231-072-3

EC Name:

Aluminium

Cas Number:

7429-90-5

Molecular formula:

Al

IUPAC Name:

aluminium

Radiolabelling:

no

Study design

Test temperature:

environmental relevant temperatures

Batch equilibrium or other method

Analytical monitoring:

yes

Details on sampling:

Sediment sampling:
- three sediment samples were collected in both rivers, three replicates were collected from each site
- sediment sampler: equipped with a polymethylmethacrylat inner liner (KC Denmark)

Sediment treatment in laboratory:
- under a N2 atmosphere sediment core samples were subdivided into 0-10 cm, 10-20 cm and 20-30 cm sections

Pore water collection:
- Sediment samples from the 0-10 cm section were transferred to a polypropylene (PP) Büchner funnel with a 25 µm mesh nylon filter
- extraction of minimum 15 ml pore water under suction of 10 kPa to a 50 ml PP tube
- filtration of 10 ml of the collected pore water through a 0.45 µm nylon filter (Millipore)

Sediment and pore water parameters:
- pH and redox potentials was determined in the pore water

Sample storage:
- acidified pore water samples and sediments were frozen and transported to Denmark for further treatment and analyses

Details on matrix:

- organic carbon content in sediments: 1.2-5.3% and 1.8-10.6% in the To Lich and Kim Nguu rivers, respectively
- pH: 7.4-8.1 in the pore water extracted from the upper 10 cm sediment of both rivers
- inorganic carbon in sediments: 0.02-2.12%
- redox potential in the pore water samples: -257 to -185 mV (highly reduced)

Results and discussion

Partition coefficients

Key result

Phase system:

other: sediment-pore water

Type:

log Kp

Value:

6.81 L/kg

Matrix:

sediment and pore water samples from all six sites

Remarks on result:

other: see 'Remarks'

Remarks:

Log Kp range for all six sites: 5.92-6.81 L/kg; sediment organic carbon concentration 1.2-5.3% and 1.8-10.6% in the To Lich and Kim Nguu river, respectively

Results: Batch equilibrium or other method

Recovery of test material:

85-108%

Transformation products:

no

Any other information on results incl. tables

Mean and standard deviation (n=3) for sediment elemental aluminium concentrations (mg/kg dw sediment) in Kim Nguu river:

Depth	Site 1	Site 2	Site 3
0 -10 cm	37 490 ± 4716	39 875 ± 2374	56 446 ± 13 168
10 -20 cm	57 350 ± 7204	61 777 ± 15 707	47 658 ± 18 739
20 -30 cm	53 492 ± 2619	41 870 ± 21 334	54 012 ± 30 252

Mean and standard deviation (n=3) for sediment elemental concentrations of aluminium (mg/kg dw sediment) in To Lich river:

Depth	Site 1	Site 2	Site 3
0 -10 cm	41 334  ± 3752	62 138  ± 32 641	61 062  ± 18 526
10 -20 cm	41 104  ± 4122	47 034  ± 386	55 381  ± 5618
20 -30 cm	47 911  ± 7017	64 845  ± 9037	50 917  ± 30 611

Range for the elemental pore water concentration (µg/L) in both river sediments:

Al: (5.92 -26.5) x 10³

Applicant's summary and conclusion

Validity criteria fulfilled:

not applicable

Conclusions:

Reliable levels of aluminium were determined in sediment and pore water samples of sediments from two rivers which were exposed to untreated wastewater in Hanoi, Vietnam. Sampling and analytical procedures are considered adequate and resulted in reliable data. Assuming equilibrium between the typical concentration in pore water and sediment, relevant Kd-values were generated. Data are therefore considered useful for the determination of a relevant Kd for the sediment compartment and log Kd values for all six locations in the rivers To Lich and Kim Nguu range from 5.92-6.81 L/kg.