Zeolite, phosphor containing, crystalline, synthetic, non fibrous

Sediment toxicity

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

Test material information

Constituent 1

Reference substance name:

Automatically generated during migration to IUCLID 6, no data available

IUPAC Name:

Automatically generated during migration to IUCLID 6, no data available

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 concentrations

Effect concentrations 1

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

Effect concentrations 2

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

Effect concentrations 3

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.