Electrolytes, copper-manufg., spent

Additional physico-chemical information

Administrative data

Endpoint:

other: representative chemistry

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: No GLP study but other quality assurance.

Cross-reference

Cross-reference 1

Reason / purpose for cross-reference:

reference to same study

Cross-reference 2

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Materials and methods

Principles of method if other than guideline:

Chemistry /elemental analysis was determined using ICP (inductively Coupled Plasma spectroscopy) and iodometric analysis (determination of sulphuric acid content).

GLP compliance:

no

Remarks:

but equivalent Quality Assurance

Test material

Test material information

Constituent 1

Reference substance name:

Electrolytes, copper-manufg., spent

EC Number:

273-752-2

EC Name:

Electrolytes, copper-manufg., spent

Cas Number:

69012-54-0

IUPAC Name:

electrolyte, copper manufacturing, spent

Details on test material:

Sampling was made in accordance with sampling protocol of the REACH Copper Consortium.
Sample was sent by Harlan to Outotec on 3rd Sept 2010

Results and discussion

Results:

The purpose of the study was to determine important chemical properties of B12, representative spent electrolyte solution, sample as supplied by Reach Copper Consortium.

Any other information on results incl. tables

The chemical composition of a representative sample from B12 “Electrolyte, copper manufacturing, spent”, provided by theReach Copper Consortiumwas analyzed. Thesolution consists mainly of sulfur (93000 mg/l), nickel (5700 mg/l), arsenic (4480 mg/l) and copper (2130 mg/l). The complete analyze is given inTable2. The density of the sample is 1.19 g/cm³and its pH is below 1

General information on the sample is presented inTable1

Table1:General information on the test item.

Sample	Electrolyte, copper manufacturing, spent
Sample	B12
Outotec code	10TT07091
Treatments applied prior to testing	Filtration
Physical state at 20°C and 101.3 kPa	Liquid
Apparent stability	Stable
Homogeneity	Homogenous
Colour	Transparent – black precipitate
Odour	Odorless
pH	<1
Density, g/cm3	1.19

1.                     

1.1.                 

Table 2 gives the elemental sample analysis. The analysis techniques are described in chapter 5. The elemental composition for each element (expressed as mg/l sample) was converted into weight of an element per weight of solution w/w-% according to the following formula:

Wt -% = 100 x (C_i/ D),

Where

wt%: % (w/w) is weight of element i per 100 g solution

C_i: concentration of the element in the solution (in g/l)

D : density of the solution (in g/l)

 

Table2:Chemical composition of the sample.

wt-% is defined here asweight of element per weight of solution.

Outotec code	10TT07091
Sample	B 12
	mg/l	wt-%
S	93000	7.815
Ni	5700	0.479
As	4480	0.376
Cu	2130	0.179
Fe	1290	0.108
Na	600	0.050
Zn	572	0.048
Ca	250	0.021
Sb	129	0.011
Al	78	0.007
Mg	69.6	0.006
Cd	55.1	0.005
Cl-	44	0.003
Bi	35.7	0.003
Co	34.5	0.003
Si	32.6	0.001
K	12.5	0.001
Cr	7.8	0.001
Mn	6	0.001
Sn	2.1	0.000
Pb	<5	0.000
F-	<10	0.000
Ag	<0.2	0.000
Hg	<0.2	0.000
	g/l
TOC	<1
H2SO4	271
pH	<1
g/cm3	1.19

Applicant's summary and conclusion

Conclusions:

Study assessed full chemistry of a representative sample. The proposed RWC chemistry (distribution pattern for each key element, i.e. % from Total into the various soluble species present in the UVCB) can be used for classification of the UVCB substance (mixture toxicity rules). the UVCB consists of water, sulphuric acid and small amounts of various metal sulphates salts

Executive summary:

The UVCB substance, which is a complex mixture of metallic salts and sulphuric acid, which decomposes and partially precipitates spontaneously at ambient temperature. The S content measured by ICP (+ H2SO4 (g/l) was measured via iodometric analysis), in order to assess the "S" content of the UVCB.

The major constituents of the UVCB are Sulphuric acid (with ca. 25%) and water (ca. 75%). In the representative sample, the main residual constituents were Ni (ca. 0,48%), As (0.38%), Cu (ca. 0.18%), Fe (ca. 0.11%). The TOC was <1% and, the other minor constituents were <0,01% each)

Based on these results the following RWC Distribution pattern is derived (relevant for classification):

Sulphur present as sulphate and Sulphuric acid (reported as H2SO4: ca. 15%)

Arsenic present as soluble forms (100% from total As)

other metal elements: present to 100% from total element as soluble (sulphate) form