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Ecotoxicological information

Sediment toxicity

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Administrative data

Endpoint:
sediment toxicity: long-term
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: comparable to guideline study with acceptable restrictions (no GLP, no purity of the test substance given)

Data source

Reference
Reference Type:
publication
Title:
Aquatic environmental safety assessment for a nonphosphate detergent builder
Author:
Maki AW and Macek KJ
Year:
1978
Bibliographic source:
Environ. Sci. Technol. 12, 573-580

Materials and methods

Principles of method if other than guideline:
Two full life-cycle tests were studied in a static test with Paratanytarsus parthenogenica.
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Type A zeolite
- Chemical name: Zeolite, cuboidal, crystalline, synthetic, non-fibrous
- Framework: cuboidal
- Related CAS number: 1318-02-1
- Analytical purity: no data
- Type A zeolite was surface modified: Analysis by atomic adsorption indicated that 90% existed in the Ca2+-modified form with a total of 10% as Mg2+, Na+ and K+ salts.

Sampling and analysis

Analytical monitoring:
no

Test substrate

Vehicle:
no

Test organisms

Test organisms (species):
other: Paratanytarsus parthenogenica (midge, diptera)

Study design

Study type:
laboratory study
Test type:
static
Water media type:
freshwater
Limit test:
no
Exposure duration
Exposure phase:
total exposure duration
Remarks:
Two full life cycles, no information about the total exposure duration available.

Test conditions

Hardness:
300 mg/L
Test temperature:
no data
pH:
7.6+/-0.2
Dissolved oxygen:
no data
Nominal and measured concentrations:
The following concentrations were tested: 0, 50, 75, 100, 200 and 300 mg/L.
Reference substance (positive control):
not specified

Results and discussion

Effect concentrationsopen allclose all
Dose descriptor:
EC50
Effect conc.:
364.9 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
reproduction
Remarks on result:
other: Duration: two full life cycles, no information about the total exposure duration available
Dose descriptor:
NOEC
Effect conc.:
> 200 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
emergence rate
Remarks on result:
other: Duration: two full life cycles, no information about the total exposure duration available
Dose descriptor:
NOEC
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
reproduction
Remarks on result:
other: Duration: two full life cycles, no information about the total exposure duration available

Any other information on results incl. tables

NOEC for adult emergence and larval growth was >200 mg/L, NOEC for egg production was >100 mg/L.
Test concentration <= 200 mg/L: pupation and adult emergence up to and including day 22

Test concentration > 200 mg/L: pupation and adult emergence on day 30

Following effect concentrations were calculated:

parameter
             EC50 [mg/L]     95% confidence limits
F0 hatchability
       551.8              370.9 - 1175.4
F0 pupation
           298.1              287.1 -  308.8
F0 adult emergence
    274.2              264.9 -  283.9
F1 egg production
     364.9              311.6 -  455.8

The effects on adult emergence are not interpreted as toxic effects, but rather are related to the physical properties of the test material as they settled to the bottom of the test chamber.
Inhibition of larval growth is discussed as generalised response of the midges to adverse environmental conditions, and here probably reflects a growth lag resulting from the ingestion of the nonnutritive zeolite particulates during feedings.

Applicant's summary and conclusion