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EC number: 215-252-9
CAS number: 1315-01-1
1 Results of AAS-analysis (AAS = Atom-Absorption-Spectroscopy) of the
Definitive Water Solubility TestofTin
disulfide (Tin and Tin sulfide concentration in µg/L; mean values of
5 measurements) of the control and nominal testconcentration10.0
mg/L (time 1 – 5 d) in the test vessels.
10 mg/LSnS2cResults(µg Tin/L)
cResults(µg Tin disulfide/L) *
< LOD *
Calculations based on the theoretical amount of 64.9 % Sn in SnS2
(AAS = Atom-Absorption-Spectroscopy) of the Definitive Water Solubility
Test with Tin disulfide at nominal test concentration of 10.0 mg/L were
between results of day 4 and 5 was 5.4 %, hence the validity criterion
of OECD-Guideline 105 was met (trigger
to OECD-Guideline 105 Water Solubility of the test item Tin disulfide
was calculated from the mean value of results of AAS-analysis at time 4
d and 5 d.
Solubility of Tin disulfide: 0.67µg/L
The water solubility of tin disulfide
(purity 100%) was determined in a GLP study according to OECD 105 using
the slow stirr method. The study was scored as Klimisch 1 study based on
the good documentation of the methods and the results and following of
the procedures outlined in the OECD 105 guideline. Tin disulfide was
determined by measuring the concentration of dissolved tin moiety in the
solution. The measeurd water solubility of tin sulfide was 0.67 µg/L.
The results of this study are considered relevant for the risk
assessment of tin sulfide.
0.00000067 g/L = 0.67 µg/L
For the determination of the water
solubility of tin disulfide one Klimisch 1 (Aniol 2012) and one Klimisch
2 study (Paß 2011) are available. Both studies were performed following
OECD and EU guidelines with the shake flask method. The deviations to
the guidelines were minor and hence considered to have no impact on the
outcome of the study. However, both studies came to different results
regarding the water solubility, i.e., 0.67 µg/L (Aniol, 2012) vs. 48
mg/L (Paß, 2011).
In the GLP- Klimisch 1 study from
Aniol (2012) the water solubility was determined by analyzing the
concentration of tin in the solution. The amount of test material which
was used to prepare the saturated solution was 10 mg/L. In the study
from Paß (2011), the sulfur moiety was measured and the concentration of
the test material used to prepare the saturated solution was 25 g/L and
hence orders of magnitude higher than the expected (and later measured)
water solubility. it might be speculated that this higher amount of test
material in the suspension might have caused higher concentrations of
smaller particles in the final solution and the sensitivity of the
sulfur detector was not as high as the sensitivity of the AAS detector
for tin. This might have
resulted in the orders of magnitude higher water solubility values when
compared to the result obtained from Aniol (2012).
Based on the better analytical
procedures and the better documentation, the study from Aniol (2012) is
considered to be relevant. The experimentally determined water
solubility of 0.67 µg/L was considered as reliable and relevant for the
further risk assessment.
The water solubility of tin disulfide
is 0.67 µg/L
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