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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
biodegradation in soil
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The testing methodology is well described Acceptable, well-documented publication which meets basic scientific principles

Data source

Reference
Reference Type:
publication
Title:
Phosphate-induced lead immobilization from different lead minerals in soils under varying pH conditions
Author:
Xinde Cao, Lena Q. Ma, SatyaP. Singh, Qixing Zhou
Year:
2008
Bibliographic source:
Environmental pollution 152, 184-192

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Dissolution behaviour of Pb in soils at different pH
GLP compliance:
not specified
Test type:
laboratory

Test material

Constituent 1
Chemical structure
Reference substance name:
Lead carbonate
EC Number:
209-943-4
EC Name:
Lead carbonate
Cas Number:
598-63-0
Molecular formula:
CH2O3.Pb
IUPAC Name:
λ²-lead(2+) carbonate

Study design

Oxygen conditions:
not specified
Soil classification:
not specified
Soil propertiesopen allclose all
Soil no.:
#1
Soil type:
sandy loam
% Clay:
>= 0 - <= 10.9
% Silt:
>= 0 - <= 10.9
% Sand:
89.1
% Org. C:
2.96
pH:
>= 7.57 - <= 7.59
CEC:
4.7 other: cmoles/Kg
Soil no.:
#2
Soil type:
sandy loam
% Clay:
>= 0 - <= 13.5
% Silt:
>= 0 - <= 13.5
% Sand:
86.5
% Org. C:
5.09
pH:
>= 7.2 - <= 7.22
CEC:
6.7 other: cmoles/Kg
Duration of test (contact time)open allclose all
Soil No.:
#1
Duration:
2 wk
Soil No.:
#2
Duration:
2 wk
Initial test substance concentrationopen allclose all
Soil No.:
#1
Initial conc.:
7.7 mg/kg soil d.w.
Based on:
not specified
Soil No.:
#2
Initial conc.:
5 550 mg/kg soil d.w.
Based on:
not specified
Experimental conditionsopen allclose all
Soil No.:
#1
Temp.:
room temp.
Humidity:
40%
Soil No.:
#2
Temp.:
room temp.
Humidity:
40%

Results and discussion

% Degradationopen allclose all
Soil No.:
#1
% Degr.:
0.03
Parameter:
other: pH = 7
Sampling time:
3 h
Soil No.:
#1
% Degr.:
1.29
Parameter:
other: pH = 5
Sampling time:
3 h
Soil No.:
#1
% Degr.:
51
Parameter:
other: pH=3
Sampling time:
3 h
Soil No.:
#2
% Degr.:
0.03
Parameter:
other: pH=7
Sampling time:
3 h
Soil No.:
#2
% Degr.:
0.8
Parameter:
other: pH = 5
Sampling time:
3 h
Soil No.:
#2
% Degr.:
38.4
Parameter:
other: pH = 3
Sampling time:
3 h
Transformation products:
not specified
Evaporation of parent compound:
not specified
Volatile metabolites:
not specified
Residues:
not specified

Applicant's summary and conclusion

Conclusions:
In the study, lead carbonate was found slightly soluble in soil at neutral pH, but much more soluble at acidic pH. However, using Phosporus can easily form an insoluble form.