Lead cyanamidate

Water solubility

Administrative data

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: guideline study according to GLP standard

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2011

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

GLP compliance:

yes (incl. QA statement)

Type of method:

flask method

Test material

Test material information

Constituent 1

Reference substance name:

Lead cyanamidate

EC Number:

244-073-9

EC Name:

Lead cyanamidate

Cas Number:

20837-86-9

Molecular formula:

CN2.Pb

IUPAC Name:

λ²-lead(2+) (azanidylenemethylidene)azanide

Results and discussion

Details on results:

The measured concentration in the flasks 2 - 7 onday 7 at the end of the test lay in the range of 0.06 -3.42 mg/L.
Due to the oxidation of the test item during the test in all flasks and high deviation from the measuerment in all flasks, a defined solubility of Cyanamide, lead(2+) salt (1:1) can not be stated.

IR spectroscopy
No N=C=N valence vibration was found in the chromatogram of hydrolysis product of Cyanamide, lead(2+) salt (1:1) at 1940 -1981 cm-1, but new valence vibration at 1413 cm-1 was observed, as a possible band for C=O (CO3)2-.

Element analysis
After the hydrolysis of the test item no nitrogen was found. Before the hydrolysis the content of nitrogen in the test item was 10.3 %.
The oxygen content after the hydrolsis was greater (16.7 %) than before hydrolysis (2.08 %).

Any other information on results incl. tables

Results

Due to the oxidation of the test item during the test in all flasks and high deviation from the measuerment in all flasks, a defined solubility of Cyanamide, lead(2+) salt (1:1) can not be stated.

After analysis of the hydrolysis product, it is presumed, that the hydrolysis product of the test item Cyanamide, lead(2+) salt (1:1) consists of lead carbonate ((PbCO3).

Applicant's summary and conclusion

Conclusions:

Interpretation of results (migrated information): decomposes
The presented data are reliable and adequate.

Executive summary:

The flasks method was used for the determination of the solubility of the test item in water as according to guidance for the implementation of REACH (R.7.1.7) column elution method should be used for organic substances only. In the main study, 51 - 107 mg/L Cyanamide, lead(2+) salt (1:1) in water were used in seven different vessels and the vessels were shaken at 20 + 0.5 °C. On day 1, 2, 3, 5, 6 and 7, vessels 1 was taken from the shaking apparatus and stored at 20 + 0.1 °C for equilibration. Samples were taken, filtrated and analysed using AAS for Pb as shaking of the test vessels was continued.

Due to the changes of colour in the flasks, the test was aborted on day 7. In flasks 2, 4 and 7 the colour of the test item had changed from yellow to white already on day 2. On day 6, the colour of the test item in flasks 1 and 3 was changed, too. At the end of the test (day 7), the test item in flasks 5 and 6 was still slightly yellowish, but lessthan on day 6.

On day 7 the the concentrationof Cyanamide, lead(2+) salt (1:1) lay in the range of 0.06 -3.42 mg/L.

Due to the oxidation of the test item during the flasks and high deviation within the single measurements in all flasks, no defined water solubility of Cyanamide, lead(2+) salt (1:1) can be stated.

After analysis of the hydrolysis product, it is presumed, that the hydrolysis product of the test item Cyanamide, lead(2+) salt (1:1) consits of lead carbonate (PbCO3).