Aluminum magnesium vanadium oxide

Bioaccumulation: terrestrial

Link to relevant study record(s)

Reference

Endpoint:

bioaccumulation: terrestrial

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

3 (not reliable)

Rationale for reliability incl. deficiencies:

other: No standard test, no guideline was followed, information on methods are not sufficient

Justification for type of information:

Aluminium Magnesium Vanadium oxide is poorly soluble. A minor fraction may dissolve into the aqueous phase releasing individual metal components. Results as reported in this study are for Vanadium, representing one of the components of Aluminium Magnesium Vanadium oxide.

Qualifier:

no guideline followed

Principles of method if other than guideline:

V exposure to soybean seedlings and V measurement

GLP compliance:

no

Radiolabelling:

no

Vehicle:

no

Details on preparation and application of test substrate:

A basal amounts of NPK (120–100–80 Kg ha−1) fertilizers and seven V concentrations (0, 5, 10, 15, 30, 50 and 75 mg/kg, with NH4VO3 solutions in neutralised pH 6.0) were applied before potting, and mixed carefully with the soils.

Test organisms (species):

other: Soybean

Details on test organisms:

- Source: grown in pots containing 4 kg of soil

Total exposure / uptake duration:

45 d

Details on test conditions:

- No. of organisms per container (treatment): 4 seedlings per pot
- No. of replicates per treatment group: 3
- Each pot was placed on a plastic saucer and watering with 400 ml deionized waters/day

SOURCE AND PROPERTIES OF SUBSTRATE
- surface (depth 0-20 cm)
- air-dried and sieved to 2 mm

Soil 1: fluvoaquic soil (Fluvaquents, USA), collected from Fenqiu County, Henan Province.
pH = 8.2
- Organic matter = 0.72%
- clay = 20%
- total vanadium = 66.7 mg V/kg dw

Soil 2: red earth (Oxisols, USA), derived from Q3 red sandstone, collected from Yingtan County, Jiangxi Province.
- pH = 5.8
- Organic matter = 1.2%
- clay = 32%
- total vanadium = 35 mg V/kg dw

- Seedling procedure after exposure period: drying, weighing and digesting with HNO3–HClO4 and analysed for concentration of V.

Nominal and measured concentrations:

Nominal: 0, 5, 10, 15, 30, 50 and 75 mg V/kg

Type:

BSAF

Value:

>= 0.01 - <= 0.03 dimensionless

Basis:

other: shoots

Calculation basis:

other: 45 days after seeding

Remarks on result:

other: Soil 1

Type:

BSAF

Value:

>= 0.005 - <= 0.014 dimensionless

Basis:

other: shoots

Calculation basis:

other: 45 days after seeding

Remarks on result:

other: Soil 2

Details on results:

Fluvo-aquic soil (soil 1): concentrations of V in the shoots increased gradually as the concentration of V in soil increased. At concentrations exceeding 30 mg V/kg, they increased significantly (>5% LSD)
Oxisol soil (soil 2): no significant effect of V on the concentrations of V in the shoot

Validity criteria fulfilled:

not specified

Description of key information

Bioaccumulation is of no concern for the assessed substance.

Additional information

No data are available for bioaccumulation of aluminium magnesium vanadium oxide (CAS 170621-28-0).  However, using the transformation/dissolution test for this substance information is provided on the release of bioavailable species of vanadium, aluminium and magnesium in the aquatic and terrestrial environment under different environmental conditions. With regard to this information, it is possible to address bioaccumulation of the substance by using a read-across towards the individual metals. Available experimental and field data on vanadium, aluminium and magnesium were used for a weight of evidence. As an essential metal, magnesium homeostasis regulates its uptake and organisms will keep their intracellular levels relatively constant across aquatic and terrestrial species. In consequence, secondary poising of magnesium is not considered relevant. Metals that are biologically essential are actively regulated in organisms (homeostasis). Non- essential metals are also actively regulated to some extent and therefore also for non-essential metals, an inverse relationship between the metal concentration and the external concentration may be observed (McGeer et al., 2003). This may explain the observed inverse relationship between BCF/BAF values and exposure concentrations of vanadium and aluminium, although the essential status of vanadium is still under discussion The available data on vanadium and aluminium suggest that both vanadium and aluminium do not biomagnify. A trophic transfer of vanadium and aluminium into aquatic/terrestrial environments is generally not a concern because bioaccumulation of vanadium and aluminium is low, whereas BCF/BAF values of vanadium is, in general less than 100 and availability of aluminium is limited by its transformation and precipitation under environmental conditions.