Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
Cross-reference
- Reason / purpose for cross-reference:
- data waiving: supporting information
Reference
- Endpoint:
- water solubility
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2022
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.6 (Water Solubility)
- GLP compliance:
- no
- Type of method:
- flask method
- Remarks:
- According to Regulation (CE) 440/2008 in the attachment A. 6, the elution on column method should have been performed, but, due to the insolubility of the material in any organic solvent, the only method applicable was flask method
- Key result
- Water solubility:
- 0.44 mg/L
- Conc. based on:
- element (dissolved fraction)
- Remarks:
- The quantity of solubilized substance was quantified by detecting the zinc with Inductively Coupled Plasma Optical Emission Spectroscopy ICP-OES technique
- Incubation duration:
- 72 h
- Temp.:
- 30 °C
- pH:
- 7.36
- Key result
- Water solubility:
- 0.4 mg/L
- Conc. based on:
- element (dissolved fraction)
- Remarks:
- The quantity of solubilized substance was quantified by detecting the zinc with Inductively Coupled Plasma Optical Emission Spectroscopy ICP-OES technique
- Incubation duration:
- 48 h
- Temp.:
- 30 °C
- pH:
- 7.4
- Key result
- Water solubility:
- 0.45 mg/L
- Conc. based on:
- element (dissolved fraction)
- Remarks:
- The quantity of solubilized substance was quantified by detecting the zinc with Inductively Coupled Plasma Optical Emission Spectroscopy ICP-OES technique
- Incubation duration:
- 24 h
- Temp.:
- 30 °C
- pH:
- 7.33
- Conclusions:
- The substance pentazinc dichloride octahydroxide shows a very low solubility in water, equal to 0.72 ± 0.05 mg/L (< 1 ppm)
The initial pH was 7.65.
The following table shows the pH values detected for each sample, the concentration of zinc and the corresponding solubility of the substance.
| Flask | Time at 30 °C | pH | [Zn2+](mg/L) | [Zn2+] (mg/L) | Pentazinc dichloride octahydroxide solubility (mg/L) |
| A | 24 h | 7.33 | 0.482 | 0.45 ± 0.03 | 0.75 ± 0.05 |
| 0.415 | |||||
| 0.443 | |||||
| B | 48 h | 7.40 | 0.369 | 0.40 ± 0.03 | 0.67 ± 0.05 |
| 0.409 | |||||
| 0.420 | |||||
| C | 72 h | 7.36 | 0.484 | 0.44 ± 0.03 | 0.75 ± 0.05 |
| 0.420 | |||||
| 0.420 |
Calculating the average value, the solubility of the substance is 0.72 ± 0.05 mg/L
Data source
Materials and methods
Results and discussion
Applicant's summary and conclusion
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