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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Key value for chemical safety assessment

EC50 for freshwater algae:
0.46 mg/L
EC50 for marine water algae:
0.001 mg/L
EC10 or NOEC for freshwater algae:
0.08 mg/L
EC10 or NOEC for marine water algae:
0 mg/L

Additional information

Studies on algae showed NOEC values of 0.08 mg/L for Selenastrum capricornutum which indicates that NaPT is toxic. The LC50values range was 0.46 mg/L mg NaPT/L.

 

Further studies with the freshwater algae Anabaena flosaque using ZPT gave a value of 0.0038 mg/L.  

 

PSA gave much higher values of 5.46 mg/L for the NOEC with Selenastrum.

Table 6.1.5.1: Growth inhibition effects of NaPT on algae

Guideline /
Test method

Species

Endpoint /
Type of test

Exposure

 

Results (mg/L)

Remarks

Reference

design

duration

 

NOEC

EC50

 

 

OECD 201

Fresh water algae

Selenastrum capricornutum

Growth inhibition

Static

72 hours

 

0.08

 (72 hr)

0.46

(72 hr)

 

 

 

6.1.5.001

ESPTF 7041-301

Smyth et al (1994)


Table 6.1.5.2: Growth inhibition effects of Pyridine-N-oxide-2-sulfonic 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

Fresh water algae

Selenastrum capricornutum

Growth inhibition

Static

120 hours

 

11.8 (120 hr)

36.3

(120 hr)

 

 

 

6.1.5.006

EZPTF 7041-311

Boeri RL, Kowalski PL, Ward TJ (1994)

 

 

Table 6.1.5.3: 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

Fresh water algae

Selenastrum capricornutum

Growth inhibition

Static

120 hours

 

5.46

 (120 hr)

28.9

 (120 hr)

 

 

 

6.1.5.007

EZPTF 7041-312

Boeri RL, Kowalski PL, Ward TJ (1994)

 

 


Table 6.1.5.4: 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

Fresh water algae

Selenastrum capricornutum

Growth inhibition

Static

120 hours

 

0.080 (120 hr)

0.140 (120 hr)

 

 

 

6.1.5.004

EZPTF 7041-310

Ward TJ, Magazu JP, Boeri RL (1995)

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.


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