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Administrative data

Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: These data are from a recognised data source for information on pKa values and stability constants (Martell and Sillen).

Data source

Referenceopen allclose all

Reference Type:
other: expert report
Title:
Unnamed
Year:
2003
Reference Type:
secondary source
Title:
No information
Author:
Gledhill W E, Feijtel T C J
Year:
1992
Bibliographic source:
Environmental Properties and Safety Assessment of Organic Phosphonates used for Detergent and Water Treatment Applications, 1992, pp 261-285
Reference Type:
review article or handbook
Title:
Stability constants
Author:
Martell AE and Sillen LG
Year:
1968
Bibliographic source:
Supplement No.1 Special Publication 25. The London Chemical Society, Alden Press, London 1968

Materials and methods

Test material

Constituent 1
Chemical structure
Reference substance name:
[[(phosphonomethyl)imino]bis[ethylenenitrilobis(methylene)]]tetrakisphosphonic acid, potassium salt
EC Number:
284-362-7
EC Name:
[[(phosphonomethyl)imino]bis[ethylenenitrilobis(methylene)]]tetrakisphosphonic acid, potassium salt
Cas Number:
84852-49-3
Molecular formula:
C9H28N3O15P5.xK
IUPAC Name:
[[(phosphonomethyl)imino]bis[ethylenenitrilobis(methylene)]]tetrakisphosphonic acid, potassium salt
Constituent 2
Reference substance name:
[[(phosphonomethyl) imino]bis[ethylenenitrilobis(methylene) ]]tetrakisphosphonic acid, potassium salt
IUPAC Name:
[[(phosphonomethyl) imino]bis[ethylenenitrilobis(methylene) ]]tetrakisphosphonic acid, potassium salt

Results and discussion

Results:
Memo: A wide range of stability constants for the association of the substance with metal ions is available. These all show high values, suggesting that in the environment the substance will be associated with ions such as calcium and magnesium.

Any other information on results incl. tables

In order of complexation strength, values of the log10 of the stability constants of representative metals with DTPMP are:
Hg        22.6
Cu        19.5
Zn        19.1
Ni        19
Co        17.3
Cd        9.7
Pb        8.6
Ca        6.7
Mg        6.6

Applicant's summary and conclusion