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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 10 day Minimum Inhibitory Concentration (MIC100) value of calcium iodate in green algae (Dunaliella salina) was found to be 843.1238 mg/L based on its effect on the growth rate. This value indicates that the chemical will not exhibit short term toxicity to algae. As per the CLP criteria,the substance will not be classifed for Aquatic toxicity.

Key value for chemical safety assessment

Additional information

Based on the various studies available with Klimish rating 2 for the read across substances for CAS NO 7789-80-2 and based on the category approach of organic functional group along with similar mechanistic approach and having structural similarities defined by QSAR toolbox. The results is summarized as follows

 

Sr.No

Endpoint

Effect values

Basis for effects

Duration

Species

Remarks

1

MIC

843.1238 mg/l

growth rate

10 days

Dunaliella salina

Predicted data for target chemical

2

MIC

1124.559 mg/l

growth rate

10 days

Cryptomonas sp.

Predicted data for target chemical

3

MIC

2600.4mg/l

growth rate

10 days

N. closterium

Data from publication for CAS no 7681-11-0

4

MIC

2590.7mg/l

growth rate

10 days

Phaedactylum tricornutum

Data from publication for CAS no 7681-11-0

5

MIC

696.2mg/l

growth rate

10 days

Chlorella sp.

Data from publication for CAS no 7681-11-0

 

By applying weight of evidence approach to the studies summarized in the above table it can be observed that MIC (Minimum Inhibitory Concentration) value is expected to be in range of696.2 to2600.4 mg/l. Thus considering CLP Criteria for aquatic classification of the substance, it is concluded that Calcium iodate does not exhibit toxicity to green algae (Dunaliella salina, Cryptomonas sp,  N. closterium, Phaedactylum tricornutum, Chlorella sp.)