Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
1 mg/L
Assessment factor:
100
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
1 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.1 mg/L
Assessment factor:
1 000
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
14.76 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
210.019 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
210.019 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:
PNEC air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
80.528 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
PNEC oral

Additional information

Classification of Calcium iodate for effects in the environment

Several major guideline - studies (Klimisch 2) are available for calcium iodate, which show no adverse effect on three key trophic levels (fish, invertebrates and algae) when exposed to calcium iodate at concentrations up to its limit of solubility in the respective test media. The lowest value (fish) is NOEC =100 mg/L which has been used for further calculation.

In determining the classification appropriate to calcium iodate, it is necessary to consider all available evidence concerning its persistence, potential to accumulate and predicted or observed environmental fate and behaviour that may present a long-term and/or delayed danger to the structure and/or functioning of aquatic ecosystems. These points are considered below.

Persistence

Reliable studies are available to demonstrate that calcium iodate is non persistent in nature and so can be considered as biodegradable in the environment. In other words calcium iodate may therefore be expected to degrade rapidly. 

No classification is triggered based on available data, according to REGULATION (EC) No 1272/2008 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006.

 

Calcium iodate is non persistent and therefore does not satisfy the criteria for classification as persistent (P). 

Potential to accumulate

QSAR– predicted and measured log Kow values for calcium iodate are less than 3. The potential for calcium iodate to bioaccumulate in the tissues of organisms that inhabit aquatic or terrestrial matrices is therefore negligible. The calculated BCF of calcium iodate is 3.162 L/kg wet weight and below the threshold of 2000. 

Calcium iodate does not satisfy the criterion for classification as bioaccumulative (B).

The short and long-term toxicity values for fish, freshwater algae and invertebrates are NOEC = 100 mg/L, MIC 100 = 696.2 mg/L and 236.135 mg/L, respectively. The fresh water algal values and invertebrate exceed the trigger value of 100 mg/L and so will not qualify for any classification as per the CLP regulation.

Calcium iodate does satisfy the environmental effects criterion for classification as toxic (T) in case of invertebrates.

Calcium iodate is therefore not a P, T & B (or vPvB) substance.

Conclusion on classification

1. Calcium iodate is non persistent and therefore does not satisfy the criteria for classification as persistent (P). 

2. Calcium iodate does not satisfy the criterion for classification as bioaccumulative (B).

3. Calcium iodate does satisfy the environmental effects criterion for classification as toxic (T) in case of invertebrates.

So, calcium iodate is therefore not a P, T & B (or vPvB) substance.