Zinc, desilverizing skims

Additional physico-chemical information

Administrative data

Endpoint:

other: representative mineralogy

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: non GLP but other quality assurance

Cross-reference

Reason / purpose for cross-reference:

reference to same study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Principles of method if other than guideline:

Chemistry /elemental analysis was determined using ICP (inductively Coupled Plasma spectroscopy). Metal speciation/metal mineralogy was assessed from Sequential extraction/metal analysis and mineralogical analysis (XRD and microscopes equipped with EDS (Energy Dispersive Spectrometry) and WDS (Wavelength Dispersive Spectrometry) analysers. The interpretation of the overall results was performed by expert (with profound knowledge of metal particularities).

GLP compliance:

no

Remarks:

other quality assurance

Test material

Test material information

Constituent 1

Reference substance name:

Zinc, desilverizing skims

EC Number:

273-802-3

EC Name:

Zinc, desilverizing skims

Cas Number:

69029-60-3

Molecular formula:

Molecular weigth/formula concept not applicable to Inorganic UVCB (comlex metal containing substance)

IUPAC Name:

Zinc, desilverizing skims

Results and discussion

Results:

The studied sample 09TT08130 contains 66.7% lead, 20.8% zinc, 11% silver and traces of other elements.
The studied sample 09TT09779 contains 72.7% lead, 16.3% zinc, 7.6% silver and traces of other elements.

The studied sample 09TT08130 consists mainly of metallic lead (68.5%) and silver zinc, AgZn3 (31%). Metallic lead occurs as coarse grains which are associated with silver zinc –alloys. Silver zinc –alloys occur also as matrix between metallic lead grains.
The studied sample 09TT09779 consists mainly of metallic lead (72.8%), silver zinc –alloy, AgZn3 (25.5%) and lead oxide (1%). Metallic lead occurs as coarse grains which are associated with silver zinc –alloys. Silver zinc –alloys occur also as matrix between metallic lead grains. Sometimes the rims of metallic lead are strongly oxidized.

Any other information on results incl. tables

Chemical composition of the reference samples

ORC ref.			OR22	OR29
Sample			2000171/17	2000171/21
Lab code			00TT08130	09TT09779
Substance			Zinc desilverising skims	Zinc desilverising skims
EINECS			273-802-3	273-802-3
Consortium reference No.			13	13
Ag	KEM	%	11.00	7.56
B	KEM	%	N/A	N/A
Bi	TOT	%	0.391	0.014
Cd	TOT	%	<0.003	0.016
Co	TOT	%	<0.003	0.003
Mo	TOT	%	<0.003	<0.003
Sb	TOT	%	<0.014	<0.06
Se	TOT	%	<0.003	<0.06
Sn	TOT	%	<0.003	0.0043
Te	TOT	%	< 0.014	<0.02
Zn	TOT	%	20.80	16.30
SiO2	KEM	%	0.049	0.06
Al2O3	TOT	%	<0.005	<0.006
CaO	TOT	%	0.023	0.005
Cr2O3	TOT	%	<0.004	<0.004
K2O	TOT	%	<0.084	<0.04
MgO	TOT	%	0.014	<0.005
MnO	TOT	%	<0.004	<0.004
Na2O	TOT	%	0.032	<0.04
(SO4)2	KEM	%	0.011	0.007
S	LECO	%	<0.01	<0.01
C	LECO	%	0.02	0.025
Satmagan		%	0	0

ORC ref.			OR22	OR29
Sample			2000171/17	2000171/21
Lab code			00TT08130	09TT09779
Substance			Zinc desilverising skims	Zinc desilverising skims
EINECS			273-802-3	273-802-3
Consortium reference No.			13	13
As	P1	%	<0.007	<0.004
	P2	%	<0.017	<0.010
	P3	%	<0.009	<0.005
	P4	%	<0.003	0.073
	PSUM	%	<0.003	0.073
	TOT	%	<0.003	0.035
Cu	P1	%	<0.007	<0.004
	P2	%	<0.017	<0.010
	P3	%	0.026	0.04
	P4	%	0.25	0.18
	PSUM	%	0.28	0.22
	TOT	%	0.25	0.18
Fe	P1	%	<0.007	<0.004
	P2	%	<0.017	0.013
	P3	%	<0.009	0.037
	P4	%	0.013	0.008
	PSUM	%	0.013	0.058
	TOT	%	0.015	0.011
Ni	P1	%	<0.007	<0.004
	P2	%	<0.017	<0.010
	P3	%	<0.009	<0.005
	P4	%	0.01	0.016
	PSUM	%	0.01	0.016
	TOT	%	0.01	0.022
Pb	P1	%	0.041	0.24
	P2	%	0.17	0.13
	P3	%	0.23	0.52
	P4	%	62.90	64.90
	PSUM	%	63.34	65.79
	TOT	%	66.70	72.70

 

Applicant's summary and conclusion

Conclusions:

Good quality study that assessed full chemistry and mineralogy of two representative samples of zinc desilversing skims. The mineralogy (and the distribution pattern for each key element, i.e. % from Total into the various mineralogical forms/species present into the UVCB) of the reference samples can be used to derive the classification of zinc desilversing skims samples (mixture toxicity rules).

Executive summary:

The studied sample 09TT08130 consists mainly of metallic lead (68.5%) and silver zinc, AgZn3 (31%). Metallic lead occurs as coarse grains which are associated with silver zinc –alloys. Silver zinc –alloys occur also as matrix between metallic lead grains. The studied sample 09TT09779 consists mainly of metallic lead (72.8%), silver zinc –alloy, AgZn3 (25.5%) and lead oxide (1%). Metallic lead occurs as coarse grains which are associated with silver zinc –alloys. Silver zinc –alloys occur also as matrix between metallic lead grains. Sometimes the rims of metallic lead are strongly oxidized.

The mineralogy of the reference samples can be used to derive the classification of both samples but also to predict the mineralogy of other zinc desilverising skims samples. The calculator sheet, which is used to derive the classification and which reflects particular assumptions that are made, can be found in attachment above (attached background material).