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EC number: 231-072-3
CAS number: 7429-90-5
Recent studies conducted by the Chilean
Mining and Metallurgy Research Center (CIMM) tested aluminium toxicity
to C. dubia and D. magna (one data point) across a range
of pH, DOC, and hardness values. These
results demonstrated that increasing DOC concentration has a protective
effect on aluminium LC50s for invertebrates. Increasing
water hardness also had a protective effect. Aluminium
toxicity was reduced at high pH, but a larger reduction was observed
when changing pH from 6 to 7 than from 7 to 8.
The acute fish BLM developed for S. salar was
applied to the chronic invertebrate data (CIMM 2009, CIMM 2010; Figure
22.214.171.124.2.-1) by developing a critical accumulation value appropriate
for this organism. In
addition, the chronic invertebrate data suggested that overall fit would
be improved with a small increase in the Ca binding parameter (i.e. the
log K for Ca binding at the biotic ligand was increased from 4.2 to
4.8), which is the same adjusted value used in the chronic fish model. After
application of the modified Al BLM, the variability in the response
curve data substantially decreased (Figure 126.96.36.199.2.-2). These
data were subsequently used to establish the CA10 (i.e. the critical
accumulation level that results in a 10% reduction in reproduction), and
likewise, the CA50. The
CA10 and CA50 values can then be used to predict EC10 values and EC50
values in various water types.
Figures 188.8.131.52.2.-3 and 184.108.40.206.2.-4 provide
an evaluation of the ability of the chronic invertebrate Al BLM to
predict EC50 and EC10 values. All
of the EC50 values are predicted within 2-fold of the reported EC50
values. Most of the
EC10 values are predicted within 2-fold of the reported EC10 values, and
all of the predicted EC10 values are within 4-fold of the reported
results indicate that the chronic Al BLM performs reasonably well for
predicting sublethal effects of Al on invertebrates. It
should be noted that in both the fish and the invertebrate tests,
saturation index calculations suggested that the majority of the
toxicity values exceed Al(OH)3solubility. However,
bioavailability factors (i. e. pH, DOC, and hardness) still are
consistent with the trends predicted by the Al BLM.
Two additional LC50 values that are not
included in this comparison were reported for pH 7 and pH 8 in filtered
test media (i. e., filtered before organisms were exposed). The
filtered test media were approximately 5-fold less toxic, meaning that
their LC50s were approximately 5-fold higher than the results from
exposure to unfiltered media. Therefore, toxicity was largely a function
of exposure to aluminium hydroxides, which are removed by filtration
through these types of filters.
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