Lead Carbonate Intermediate

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Outotec Research Oy has a certified quality system ISO 9001:2000, Environmental system ISO 14001, and Occupational Health and Safety system ISO18001. Laboratory accrediatation according to ISO/IEC 17025 covers gas and emission measurements and copper and

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

GLP compliance:

no

Type of method:

flask method

Key result

Temp.:

20 °C

pH:

>= 7.11 - <= 9.62

Remarks on result:

other: The substance is a UVCB substance with multiple components and variable solubility for each component. Solubility results for individual metal ions were analysed, and results are presented below.

The preliminary test did not indicate any solubility for the substance. The shaking time was 14-16 days. After that each sample was equilibrated for 24 h. Results for metal concentrations for the samples are presented below. The pH in the bottle shaken for 16 days was considerably higher than in the bottles shaken for 14 and 15 days, overall the pH range was 7.11 -9.62. The major and the most hazardous constituent of this intermediate is lead (conc. >50 %) which is determined to be slightly water soluble. The solubility of Pb was 5.7 mg/l (average of three measurements). The water solubilities of Ca (325 mg/l), S (317 mg/l) and Na (98 mg/l) from the sample were highest, and considered moderately soluble. Otherwise the sample contained slightly soluble and insoluble components. The standard method involves three tests, which is not enough for a statistical analysis.   The solution samples were analysed for metal ions by ICP-OES, and the results are as follows: Metal ion  Average Solubility [mg/l] Solubility 14 days [mg/l]  Solubility 15 days [mg/l]  Solubility 16 days [mg/l]   ICP Ag  <0.2   <0.2  <0.2   <0.2  ICP Al  <0.2   <0.2  <0.2    <0.2  ICP As  <0.2   <0.2  <0.2    <0.2  ICP Bi  <0.2   <0.2  <0.2    <0.2  ICP Ca  325  324  327  323  ICP Cd  0.2  0.24   <0.2  <0.2   ICP Co  <0.1   <0.1   <0.1  <0.1   ICP Cr  <0.1   <0.1  <0.1    <0.1  ICP Cu  <0.1   <0.1  <0.1    <0.1  ICP Fe  <0.1   <0.1  <0.1    <0.1  ICP K  <2   <2  <2    <2  ICP Mg  5.3  5.4  5.4  5  ICP Mn  <0.2   <0.2  <0.2    <0.2  ICP Mo  <0.2   <0.2  <0.2    <0.2  ICP Na  98  98  97  98  ICP Ni  <0.1   <0.1  <0.1    <0.1  ICP Pb  5.7  5.3  5.7  6.2  ICP S  317  314  320  317  ICP Sb  <0.2   <0.2  <0.2    <0.2  ICP Se  <0.2   <0.2  <0.2    <0.2  ICP Si  2.6  2.5  2.6  2.6  ICP Sn  <0.2   <0.2  <0.2    <0.2  ICP Te  <0.2   <0.2  <0.2    <0.2  ICP Zn  0.2  0.2  0.17  0.22  pH    7.11  7.90  9.62

Conclusions:

The UVCB substance contains multiple components with variable water solubility. The major and the most hazardous constituent of this intermediate is lead (conc. >50 %) which is determined to be slightly water soluble. The solubility of Pb was 5.7 mg/l (average of three measurements). The water solubilities of Ca (325 mg/l), S (317 mg/l) and Na (98 mg/l) from the sample were highest, and considered moderately soluble. Otherwise the sample contained slightly soluble and insoluble components. The pH was measured to vary between pH 7.11-9.62. The standard method involves three tests, which is not enough for a statistical analysis.

The UVCB substance contains moderately soluble, slightly slouble and insoluble components.

Description of key information

The UVCB substance contains multiple components with variable water solubility. The major and the most hazardous constituent of this intermediate is lead (conc. >50 %) which is determined to be slightly water soluble. The solubility of Pb was 5.7 mg/l (average of three measurements). The water solubilities of Ca (325 mg/l), S (317 mg/l) and Na (98 mg/l) from the sample were highest, and considered moderately soluble. Otherwise the sample contained slightly soluble and insoluble components. The pH was measured to vary between pH 7.11-9.62. The standard method involves three tests, which is not enough for a statistical analysis.