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Ecotoxicological information

Toxicity to aquatic plants other than algae

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Endpoint:
toxicity to aquatic plants other than algae
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
Sodium isobutyl xanthate as the main constituent of Reaction mass of SIBX
Qualifier:
according to guideline
Guideline:
OECD Guideline 221 (Lemna sp. Growth Inhibition Test)
GLP compliance:
yes
Analytical monitoring:
no
Vehicle:
no
Test organisms (species):
Lemna minor
Details on test organisms:
SPECIES #
(NAME): 507 Lemna minor (Duckweed)
AGE: 1 ls
LIFE STAGE: not reported, unknown
COMMENT: NR
Test type:
semi-static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
14 d
Hardness:
NR
Test temperature:
NR
pH:
6.5 to 8.5
Dissolved oxygen:
NR
Salinity:
NR
Nominal and measured concentrations:

TYPE VALUE RANGES STANDARD CONC (ug/L) IONCIC FRACTION
F NR 10000 TO 20000 (10000-20000) ug/L NR
Details on test conditions:
TEST CONDITIONS
STUDY TYPE:
MEDIA: FW (Fresh water)
LOCATION: LAB (Laboratory, indoor)
CONTROL: S (sufficient control)
EXPOSURE TYPE: R ( semi-static)
APPLICATION FREQ.: 1 X
EXPOSURE DUR.: 2 week(s)
STAND DUR. (D): 14 day(s)
TEST CONCENTRATION
CHEM ANAL. METHOD: unmeasured
UNIT OF MEASURE: ug/L micrograms per liter

TYPE VALUE RANGES STANDARD CONC (ug/L) IONCIC FRACTION
F NR 10000 TO 20000 (10000-20000) ug/L NR

WATER QUALITY VALUE RANGE (UNIT)
TEMPERATURE: NR NR TO NR C
pH: NR 6.5 TO 8.5
HARDNESS: NR NR TO NR mg/L CaCO3
SALINITY: NR NR TO NR
ALKALINITY: NR NR TO NR mg/L CaCO3
CONDUCTIVITY: NR NR TO NR NR
DISSOLVED OXYGEN: NR NR TO NR mg/l
ORGANIC CARBON (NR): NR NR TO NR NR
Reference substance (positive control):
no
Duration:
14 d
Dose descriptor:
EC50
Effect conc.:
10 - 20 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Details on results:
A 14 d EC50 of 10 to 20 mg/L has been determined for growth rate effects to Lemna minor of the test substance.
Validity criteria fulfilled:
yes
Conclusions:
A 14 d EC50 of 10 to 20 mg/L has been determined for growth rate effects to Lemna minor of the test substance.
Endpoint:
toxicity to aquatic plants other than algae
Type of information:
other: published data
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
Reaction mass of SIBX are related compound to SEX
Qualifier:
according to guideline
Guideline:
OECD Guideline 221 (Lemna sp. Growth Inhibition Test)
GLP compliance:
yes
Analytical monitoring:
no
Vehicle:
no
Test organisms (species):
Lemna minor
Details on test organisms:
SPECIES #
(NAME): 507 Lemna minor (Duckweed)
AGE: 1 ls
LIFE STAGE: not reported, unknown
COMMENT: NR
Test type:
semi-static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
14 d
Hardness:
NR
Test temperature:
NR
pH:
6.5 to 8.5
Dissolved oxygen:
NR
Salinity:
NR
Nominal and measured concentrations:

TYPE VALUE RANGES STANDARD CONC (ug/L) IONCIC FRACTION
F NR 10000 TO 20000 (10000-20000) ug/L NR
Details on test conditions:
TEST CONDITIONS
STUDY TYPE:
MEDIA: FW (Fresh water)
LOCATION: LAB (Laboratory, indoor)
CONTROL: S (sufficient control)
EXPOSURE TYPE: R ( semi-static)
APPLICATION FREQ.: 1 X
EXPOSURE DUR.: 2 week(s)
STAND DUR. (D): 14 day(s)
TEST CONCENTRATION
CHEM ANAL. METHOD: unmeasured
UNIT OF MEASURE: ug/L micrograms per liter

TYPE VALUE RANGES STANDARD CONC (ug/L) IONCIC FRACTION
F NR 10000 TO 20000 (10000-20000) ug/L NR

WATER QUALITY VALUE RANGE (UNIT)
TEMPERATURE: NR NR TO NR C
pH: NR 6.5 TO 8.5
HARDNESS: NR NR TO NR mg/L CaCO3
SALINITY: NR NR TO NR
ALKALINITY: NR NR TO NR mg/L CaCO3
CONDUCTIVITY: NR NR TO NR NR
DISSOLVED OXYGEN: NR NR TO NR mg/l
ORGANIC CARBON (NR): NR NR TO NR NR
Reference substance (positive control):
no
Duration:
14 d
Dose descriptor:
EC50
Effect conc.:
> 10 - < 20 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Details on results:
A 14 d EC50 of 10 to 20 mg/L has been determined for growth rate effects to Lemna minor of the test substance.
Validity criteria fulfilled:
yes
Conclusions:
A 14 d EC50 of 10 to 20 mg/L has been determined for growth rate effects to Lemna minor of the test substance.

Description of key information

A 14 d EC50 of 10 to 20 mg/L has been determined for growth rate effects to Lemna minor of the test substance.

Key value for chemical safety assessment

EC50 for freshwater plants:
10 mg/L
EC50 for marine water plants:
1 mg/L
EC10 or NOEC for freshwater plants:
2 mg/L
EC10 or NOEC for marine water plants:
0.2 mg/L

Additional information

The available data for saltwater aquatic plants other than algae are limited and to obtaine the value for PNECs for saltwaters is taken account a assesment factor 10 to extrapolate to LC50 following the “Guidance on Information Requirement and Chemical Safety Assessment R.10: Characterisation of dose [concentration]- response for environment”and “Table R.10-5 Assessment factors proposed for deriving PNEC water for saltwater for different data sets”, to account for the possibility that greater taxonomic diversity in the marine environment makes it likely that some marine taxa may be more sensitive than the most sensitive freshwater taxa