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Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

EC50 for freshwater algae:
0.003 mg/L
EC50 for marine water algae:
0.001 mg/L
EC10 or NOEC for freshwater algae:
0.002 mg/L
EC10 or NOEC for marine water algae:
0 mg/L

Additional information

The information contained within this robust summary document comes from studies which are in the ownership of Arch Chemicals Inc. and which are protected in several regions globally. This information may not be used for any purpose other than in support of the Chemical safety Report submitted by Arch Chemicals Inc. under RegulationEC 1907/2006.

Table45:Growth inhibition effects of ZPT on algae

Guideline /
Test method

Species

Endpoint /
Type of test

Exposure

Results (mg/L)

Remarks

Reference

design

duration

NOEC

EC50

US EPA –

122-2

Freshwater algae

Selenastrum capricornutum

Growth inhibition

Static

120 hours

0.0078 (120 hr)

0.028 (120 hr)

 

0.030 (72 hr)

0.100 (48 hr)

-

 Boeri, Magazu & Ward (1994)

Unpublished study

OECD 201

Freshwater algae

Selenastrum capricornutum

Growth inhibition

Static

72 hours

0.037 (72 hr)

0.067 (72 hr)

 

-

 Smyth DV, Croudace CP,

Eales GJ (1994)

Unpublished study

US EPA –

123-2

Freshwater algae

Navicula pelliculosa

Growth inhibition

Static

120 hours

0.0024 (120 hr)

0.003 (120 hr)

Key study

Boeri RL, Ward TJ (2001)

Unpublished study

US EPA – 123-2

Marine diatomSkeletonema costatum

Growth inhibition

Static

120 hours

0.00046 (120 hr)

0.0012 (120 hr)

Key study

Ward TJ, Boeri RL (2004)

Unpublished study

US EPA – 123-2

Fresh water algae

Anabaena flos-aque

Growth inhibition

Static

120 hours

0.0038 (120 hr)

0.0077 (120 hr)

-

Boeri RL, Ward TJ (2001)

Unpublished study

 

 


Table46:Growth inhibition effects ofPyridine-N-oxide-2-sulfonic acidon algae

Guideline /
Test method

Species

Endpoint /
Type of test

Exposure

Results (mg/L)

Remarks

Reference

design

duration

NOEC

EC50

US EPA –

122-2

Freshwater algae

Selenastrum capricornutum

Growth inhibition

Static

120 hours

11.8 (120 hr)

36.3 (120 hr)

-

Boeri RL, Kowalski PL,

Ward TJ (1994)

 Unpublished study

 

Table47:Growth inhibition effects of Pyridine Sulphonic acid on algae

Guideline /
Test method

Species

Endpoint /
Type of test

Exposure

Results (mg/L)

Remarks

Reference

design

duration

NOEC

EC50

US EPA –

122-2

Freshwater algae

Selenastrum capricornutum

Growth inhibition

Static

120 hours

5.46 (120 hr)

28.9 (120 hr)

-

Boeri RL, Kowalski PL,

Ward TJ (1994)

Unpublished study

 


Table48:Growth inhibition effects of 2,2’-(pyridyl-N-oxide) disulphide on algae

Guideline /
Test method

Species

Endpoint /
Type of test

Exposure

Results (mg/L)

Remarks

Reference

design

duration

NOEC

EC50

US EPA –

122-2

Freshwater algae

Selenastrum capricornutum

Growth inhibition

Static

120 hours

0.080 (120 hr)

0.140 (120 hr)

-

Ward TJ, Magazu JP, Boeri RL (1995)

Unpublished study

 

Table49:Toxicity of ZPT to aquatic plants                     

Guideline /
Test method

Species

Endpoint /
Type of test

Exposure

Results

[mg/L]

Remarks

Reference

design

duration

NOEC

EC50

LOEC

US EPA –

850 440

Duckweed

Lemna gibba G3

Growth rate

Flow-through

14 days

 (7 days exposure,

7 days recovery)

0.0040

(7 days)

0.0096

(0.0048 – 0.019,

7 days)

 

-

 

-

Ward TJ, Magazu JP,

Boeri RL (1998)

Unpublished study