Slimes and Sludges, zinc sulfate electrolytic

Short-term toxicity to aquatic invertebrates

Administrative data

Endpoint:

short-term toxicity to aquatic invertebrates

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Guideline followed. Study well conducted.

Data source

Reference

Reference 1

Reference Type:

study report

Title:

Unnamed

Year:

2007

Reference 2

Reference Type:

study report

Title:

Unnamed

Year:

2010

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: USEPA(2002) Methods for measuring the acute toxicity of effluents and receiving waters to freshwater organisms. Cincinnati, Ohio, U.S. Environmental Protection Agency

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

Lead dinitrate

EC Number:

233-245-9

EC Name:

Lead dinitrate

Cas Number:

10099-74-8

Details on test material:

- Name of test material (as cited in study report): Pb

Sampling and analysis

Analytical monitoring:

yes

Test solutions

Vehicle:

no

Test organisms

Test organisms (species):

Ceriodaphnia dubia

Details on test organisms:

- Test organisms originate from Aquatic Biosystems and maintained in dechlorinated tapwater at 26°C
- For all tests, a mass culture was started and maintained for 3 days. All mass cultures were fed with a combination of YCT and algae
- Test organisms were < 24 h old before testing

Study design

Test type:

semi-static

Water media type:

freshwater

Limit test:

no

Total exposure duration:

48 h

Test conditions

Hardness:

16.4 mg/L

Test temperature:

25°C

pH:

5.71+-0.05

Nominal and measured concentrations:

Nominal conc. (µg/L Pb):0, 5, 10, 20, 40, 80
Measured conc. (µg/L Pb): 0, 3, 9, 17, 36, 76

Details on test conditions:

- 5 individuals/20 mL polyethylene cups
- 4 replicates were used for testing

Results and discussion

Effect concentrations

Duration:

48 h

Dose descriptor:

LC50

Effect conc.:

73.56 µg/L

Nominal / measured:

meas. (arithm. mean)

Conc. based on:

dissolved

Basis for effect:

mortality

Remarks on result:

other: 95%CI: (µg/L Pb2+): 45.1 - 119.1

Reported statistics and error estimates:

All acute tests were assessed for LC50 values using Maximum Likelihood Probit or Trimmed Spearman Karber method

Any other information on results incl. tables

Water quality parameters in micromol:

Na+: 78; Ca2 +: 106; Mg2 +: 58; K+: 55; Cl-: 408; SO42 -: 21; DOC: 50