Registration Dossier
Registration Dossier
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EC number: 231-106-7 | CAS number: 7439-97-6
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Since chemicals may cause adverse effects on microbial activity in STP’s it is necessary to derive a PNECmicroorganism. The PNECmicroorganism will be used for the calculation of the PEC/PNEC ratio concerning microbial activity in STP’s. In general, the aim of the assessment is the protection of the degradation and nitrification functions and process performance and efficiency of domestic and industrial STP’s – as also influenced by protozoan populations.
Key value for chemical safety assessment
- EC10 or NOEC for microorganisms:
- 1 µg/L
Additional information
The PNECmicroorganisms is usually derived from results obtained in the most sensitive test system available. As a growth inhibition test is available with Pseudomonas peutida (Slabbert, 1986), the PNECSTP is set equal to the NOEC (AF = 1). Based on the data available (one 6 h result with endpoint growth) the PNECSTP is derived from the available NOEC obtained by application of an assessment factor of 1, resulting in a PNECSTP of 25 µg Hg/L.
Species |
Trophic level |
Hg-salt |
|
Effect parameter |
Value (mg Hg/kg dry wt) |
Klimisch score |
Reference |
Microorganism |
Microorganisms |
HgCl2 |
Nominal |
3d- NOECrespiration (Sandy loam) 3d- NOECamylase activity (Sandy loam) |
79 79 |
K2 K2 |
Tu, 1988 |
|
Microorganisms |
HgCl2 |
Nominal |
28d- NOECrespiration (Arvada) 28d- NOECrespiration (Bainville) 28d- NOECrespiration (Terry) 6h- NOECrespiration (Arvada) 6h- NOECrespiration (Campspass and bainville) 6h- NOECrespiration (Heldt) 6h- NOECrespiration (Terry) |
9 99 124 35 40 208 248 |
K2 K2 K2 K2 K2 K2 K2 |
Landa and Fang, 1978 |
|
Microorganisms |
HgCl2 |
Nominal |
28d- NOECrespiration (Litter) |
12 |
K2 |
Spalding, 1979 |
|
Microorganisms |
HgCl2 |
Nominal |
1d- NOECrespiration (clay) |
31 |
K2 |
Pancholy et al, 1975 |
|
Microorganism |
HgCl2 |
Nominal |
42d- NOECammonification (clay) 42d- NOECnitrification (clay) 42d- NOECammonification (sand) 42d- NOECnitrification (sand) |
6 10 6 10 |
K2 K2 K2 K2 |
Van Faassen, 1973 |
|
Microorganisms |
HgCl2 |
Nominal |
3h- NOECfosfatase activity (spar-mor) |
2406 |
K2 |
Tyler, 1981 |
|
Microorganisms |
HgCl2 |
Nominal |
1,5h- NOECfosfatase activity (alkalic)(Okoboji) |
456 |
K2 |
Juma and Tabatabai, 1977 |
|
Microorganisms |
HgCl2 |
Nominal |
48d- NOECATP-content (agr. soil) |
1.4 |
K2 |
Zelles et al, 1985 |
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