Flue dust, portland cement

Sediment toxicity

Link to relevant study record(s)

Reference

Endpoint:

sediment toxicity: short-term

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2006-12-01 to 2006-12-22

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The study was performed with Portland cement clinker, which is the main component of Flue Dust.

Qualifier:

according to guideline

Guideline:

other: PARCOM (1994): MAFF/ERT Harmonised Protocol: A sediment Bioassay using an Amphipod, Corophium sp. Draft 1994.

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Vehicle:

not specified

Test organisms (species):

Corophium sp.

Study type:

laboratory study

Test type:

static

Water media type:

saltwater

Type of sediment:

natural sediment

Duration:

10 d

Exposure phase:

total exposure duration

Key result

Duration:

10 d

Dose descriptor:

LC50

Effect conc.:

ca. 9 951 mg/kg sediment dw

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Details on results:

Mortality was 0 %. This is within acceptable range.

The LCuo-value for the test substance A was found to be 9931 mg/kg (dry weight) of sediment after 10 days. The 95% confidence range was 7506-15861 mg/kg (dry weight) of sediment. The NOEC value was 875 mg/kg (dry weight) of sediment. Dose-response curve for the test substance A is presented in Figure 1. The raw data are presented in Appendix 1.

The test is considered valid if the following parameters are within the recommended ranges during the test period: r Salinity . 3.3t0.4o/o o Temperature : 15x2.4"C (max 17,4'C) . Dissolved Oxygen . pH '. 7 .51o 8.5 . o/o Lethality in controls : 1oo/o In this test, the control parameters yielded the following values: . Salinity : 3.3-3.6% o Temperature . 15t2.4'C o Dissolved oxygen : > 96% saturation . pH : 7.8-8.3 . Lethality in controls : 0 %

In this test, the control parameters temperature, DO, pH and salinity were within the recommended ranges. The test is considered to be valid.

Validity criteria fulfilled:

yes

Conclusions:

The ten day LC50 -value for the test substance was found to be 9931 mg/kg of (dry weight) sediment.
Confidence range was 7506 - 15861 mg/kg of (dry weight) sediment.
The NOAC value was 875 mg/kg of (dry weight) sediment.
Within the OSPAR regulations, the ecotoxicological test results are used differently in each country. In the guidance of the UK revised OCNS, the toxicity of Portland clinker will be assigned in the initial grouping D, since the LC50 is between >1000 -10000 ppm.

Executive summary:

The Corophium volutator sediment reworker test was performed on the test substance Portland Clinker, based on the draft from 1994 of the Paris Commission Guideline: "MAFF/ERT Harmonised Protocol. A Sediment Bioassay using an amphipod Corophium sp."

The ten day LC50 -value for the test substance was found to be 9931 mg/kg of (dry weight) sediment.

Confidence range was 7506 - 15861 mg/kg of (dry weight) sediment.

The NOAC value was 875 mg/kg of (dry weight) sediment.

The toxicity of Portland cement clinker will be assigned in the initial grouping D, since the LC50 is between >1000 -10000 ppm.

Description of key information

Read across to testing of Portland Clinker in the Corophium volutator sediment test according to "MAFF/ERT Harmonised Protocol. A sediment Bioassay using an amphipod Corophium sp." the toxicity is assigned to the initial grouping D, since the LC50 is between 1000 - 10000 ppm.
A long-term toxicity study can be waived.




 
  
  

The toxicity of Portland cement clinker will be assigned in the initial grouping D, since the LC50 is between >1000 -10000 ppm.

Key value for chemical safety assessment

EC50 or LC50 for marine water sediment:

9 931 mg/kg sediment dw

EC10, LC10 or NOEC for marine water sediment:

875 mg/kg sediment dw

Additional information

The key study was performed with Portland clinker (correct name: Portland cement clinker) and not with flue dust from Portland cement clinker production. This read across is justified, since Portland cement clinker (consisting of several clinker phases) is the dominant part of flue dust and mainly relevant for the alkalinity and the hazardous behaviour of flue dust.

According to regulation (EC) 1907/2006, Annex X, section 9.5.1, column 2: "Long-term toxicity testing shall be proposed by the registrant if the results of the chemical safety assessment indicates the need to investigate further the effects of the substance and/or relevant degradation products on sediment organisms. The choice of the appropriate test(s) depends on the results of the chemical safety assessment." The risk charakterisation indicates no risk for the aquatic compartment which includes the sediment. Therefore, the endpoint can be waived