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Physical & Chemical properties

Additional physico-chemical information

Administrative data

Endpoint:
additional physico-chemical information
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-referenceopen allclose all
Reason / purpose:
reference to same study
Reason / purpose:
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).
GLP compliance:
no
Remarks:
but equivalent Quality Assurance
Endpoint investigated:
other: representative mineralogy

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Sample collection made according to ECI/REACH Copper Consortium Standards Protocols (see IUCLID section 1.4)
Name: Weak Acid (internal: B13)
Sample description: Weak acid, bleeding from SO2 cleaning & washing operations (representative)
Sample code: AC_B13_625875

Results and discussion

Results:
The purpose of the study was to determine important chemical properties of B13, representative weak acid solution, bleeding from SO2 cleaning & washing operations sample as supplied by Reach Copper Consortium.

Any other information on results incl. tables

 

Intermediate B13

Sulphuric acid, waste gas cooling and cleaning, Copper smelting

 

"Solution obtained from the treatment (scrubbing and cooling) of the SO2containing gasses from copper production processes. The solution can be used to produce gypsum or as a leaching agent, or can be thermally decomposed. It consists mainly of sulphuric acid and copper sulphate, and may contain other non ferrous metalcompounds. Synonyms are weak acid, dilute acid, or bleed."

 

 

EC name

(or recognized name)

Substance covered

EC number / EINECS No.

CAS No.

Sulphuric acid, waste gas cooling and cleaning, copper smelting **

Weak acid, dilute acid, bleed

924-668-6

Not available

 

The chemical composition of weak acid solution, provided by Reach Copper Consortium was analyzed. The weak acid solution consists mainly of sulfur (66.6g/l) and arsenic (6640mg/l). The complete analysis is given in Table2. The density of weak acid is 1.14 g/cm3.

Table 2 gives the elemental sample analysis. The analysis method is described in the previous chapters 5. The precipitated material, mainly lead sulphate (Figure1), is excluded from the assays.

Table2: Chemical composition of studied weak acid sample.

Sample

09TT03914

H2SO4

g/l

231

S

g/l

66.6

As

mg/l

6440

Si

mg/l

544

Na

mg/l

373

Zn

mg/l

206

Fe

mg/l

60.8

Bi

mg/l

49.3

K

mg/l

21.0

Ca

mg/l

20.8

Mg

mg/l

19.7

Sn

mg/l

16.0

Cu

mg/l

9.1

Al

mg/l

5.1

Pb

mg/l

4.8

Sb

mg/l

3.7

Hg

mg/l

0.3

Mn

mg/l

0.3

Ni

mg/l

0.3

Cr

mg/l

0.2

Co

mg/l

< 0.2

Ag

mg/l

< 0.2

TOC

g/l

<1

Applicant's summary and conclusion

Conclusions:
Study assessed full chemistry of a representative Sulphuric acid bleed from waste gas washing and cooling. 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)
Executive summary:

The UVCB substance, which is a complex mixture of metallic salts and sulphuric acid, that decomposes and partially precipitates spontaneously at ambient temperature. The precipitate was characterized as PbSO4 (less than <0,1% from total sample), it was separated and not listed in the chemical assay. The S content measured by ICP was converted into H2SO4 (g/l), in order to assess the sulphuric acid content of the UVCB.

The major constituents of the UVCB are Sulphuric acid (with ca. 20%) and water (ca. 78%). In the representative sample, the main residual constituents were As (0,57%), Si (0,05%), Na (0,03%), iron (0,01%), and Zn (0,02%). The TOC was <0.01% and, the other minor constituents were <0,01% each)

Sample 09TT03914 g/g solution % w/w
H2SO4 g/l 231 2.03E-01 20.30
         
S g/l 66.6 5.85E-02 5.85
Cu mg/l 9.12 8.01E-06 0.00
As mg/l 6440 5.66E-03 0.57
Fe mg/l 60.8 5.34E-05 0.01
Ni mg/l 0.28 2.46E-07 0.00
Co mg/l < 0.2 <DL <DL
Zn mg/l 206 1.81E-04 0.02
Bi mg/l 49.3 4.33E-05 0.00
Sb mg/l 3.73 3.28E-06 0.00
Hg mg/l 0.3 2.64E-07 0.00
Sn mg/l 16 1.41E-05 0.00
Pb mg/l 4.8 4.22E-06 0.00
Ag mg/l < 0.2 <DL <DL
Cr mg/l 0.2 1.76E-07 0.00
Mn mg/l 0.3 2.64E-07 0.00
Si mg/l 544 4.78E-04 0.05
Na mg/l 373 3.28E-04 0.03
Al mg/l 5.08 4.46E-06 0.00
Mg mg/l 19.7 1.73E-05 0.00
Ca mg/l 20.8 1.83E-05 0.00
K mg/l 21 1.85E-05 0.00
TOC g/l <1 1.00E-02 1.00
density kg/l 1.14 26.834
density g/l 1138 73.166
density  mg/l 1138000 100.000
TOTAL: 74.37 0.065355369 7.54
g/L g/g %

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. 20%)

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

Other (minor) metal elements: present to 100% from total element as soluble form, each <0.1% and even <0.01%