Diphosphoric acid, copper salt

Additional information on environmental fate and behaviour

Administrative data

Endpoint:

additional information on environmental fate and behaviour

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference

Reference Type:

other: report

Title:

Erprobung und Anpassung ökotoxikologischer Methoden zur Bewertung UTD-relevanter Abfalleluate

Author:

Brasser, T. et al.

Year:

1997

Bibliographic source:

Gesellschaft für Anlagen- und Reaktorsicherheit (GRS), Köln

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

Information on the extractability, absorption by Nicotiana tabacum of copper and its sorption to unconsolidated soil sediments is given.

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

Dicopper oxide

EC Number:

215-270-7

EC Name:

Dicopper oxide

Cas Number:

1317-39-1

Molecular formula:

Cu2O

Applicant's summary and conclusion

Conclusions:

Regarding the absorption in Nicotiana tabacum,copper and lead were found to be – almost exclusively - concentrated to the roots.
Typical Cu concentrations for LUFA soils were reported and varied between 0.81 and 17.1 mg Cu/kg resulting in a median value of 4.6 mg Cu/kg.

Executive summary:

Information on the extractability, absorption by Nicotiana tabacum of copper and its sorption to unconsolidated soil sediments is given. The highest heavy metal concentrations were found in eluates of filter dust from SAV (CA202). In an aqueous extract, 4100 mg/L cadmium, 1400 mg/L zinc and 179 mg/L copper were detected. Regarding the absorption in Nicotiana tabacum,copper and lead were found to be – almost exclusively - concentrated to the roots. A study of metal binding strength to the cellular wall of root cells (2 different genotypes ofNicotiana tabacum) revealed the following ranking: Cu > Ca > Mn > Na. In soil, copper is bound less than lead, but to a much higher amount and in a wider pH range than zinc or cadmium. Mn- oxide shows the highest binding capacity for copper. The higher amount sorbed in soil is bound to inorganic substance, if this is present in the soil to higher amounts. In the pH range of 5-7, Cu shows a pronounced minimum of solubility. With increasing pH value, the stability and solubility especially of organic heavy metal complexes increases. At pH > 7, copper is completely sorbed, with decreasing pH values, copper (like lead, zinc and cadmium) is increasingly remobilised. Copper (II) - Ions form complexes with various ligands, in presence of CO₂species, a strong CuCO₃pair is predominating. Cu has a strong affinity to humic substances and is also bound to high amounts to Fe-hydroxides and Mn-oxides. In desorption studies, the addition of salts does not influence the copper mobilising. Typical Cu concentrations for LUFA soils were reported and varied between 0.81 and 17.1 mg Cu/kg resulting in a median value of 4.6 mg Cu/kg.