Alkaline co-precipitation products of soluble cobalt, manganese and nickel salts

pH

Administrative data

Endpoint:

pH

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2022

Report date:

2022

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 122 (Determination of pH, Acidity and Alkalinity)

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

Alkaline co-precipitation products of soluble cobalt, manganese and nickel salts

Molecular formula:

Co(OH)2(0.005-0.1)Co2O3(0.03-0.3)Mn3O4(0.01-0.1)MnO2(0.02-0.25)Ni(OH)2(0.35-0.91) The stoichiometry of (OH)x+Oy per metal component in the substance cannot be determined unambiguously from solely analytical data, since the composition of the present UVCB substance is highly variable (i.e. complexly mixed and poorly ordered at the atomic level). The composition of the UVCB substance can be estimated based on analytical examination in combination with a calculation that is based on the average oxidation number (NOx) in the sum of the elements Ni, Co, Mn. As a result, the following constituents in concentration ranges as described below can be identified in the UVCB: The sum of all constituents equals 1 and ranges are: • Co(OH)2: 0.005-0.1 • Co2O3: 0.03-0.3 • Mn3O4: 0.01-0.1 • MnO2: 0.02-0.25 • Ni(OH)2: 0.35-0.91

IUPAC Name:

Alkaline co-precipitation products of soluble cobalt, manganese and nickel salts

Test material form:

solid

Specific details on test material used for the study:

Name or code no.: NCM PCAM 91-4.5-4.5
Batch no.: pCAM02194
Chemical identity: Cobalt manganese nickel oxide hydroxide
Purity (UVCB): 100 %
Storage conditions: Room temperature
Production date: 2021-04-27
Expiry date: 2023-04-26

- State of aggregation:
The present sample is a nanostructured material composed of constituent particles in the nanoscale that are fused together in aggregates. The aggregates have a spherical shape with external dimensions in the µm scale.

- Particle size distribution:
D10 [nm] feret min: 18.9
D50 [nm] feret min: 26.2
D90 [nm] feret min: 36.4
D10 [nm] 2nd dimension: 74.1
D50 [nm] 2nd dimension: 126.1
D90 [nm] 2nd dimension: 200.1

- Shape of particles:
The particles have a median aspect ratio of 4.8:1.
The material is assigned to the “platelet” shape category. The shape is “plate”.

- Surface area of particles:
The mass specific surface area is 31 m²/g and the volume specific surface area is 111 m²/cm³

- Crystal structure:
trigonal

- Coating:
none

- Density:
3.6 g/cm3

- Moisture content:
water ca. 1.0 - >/= 0

Reagents

Reagent:

buffer solutions

Results and discussion

pH value

Key result

pH value:

8.7

Temp.:

20 °C

Concentration:

1 other: g / 100 ml

Any other information on results incl. tables

Results

Single values:	pH = 8.5935; 8.8018
Mean value of 2 determinations:	pH = 8.7
Estimated accuracy:	± 0.1 pH