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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.29 µg/L
Assessment factor:
1 000
Extrapolation method:
assessment factor

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.029 µg/L
Assessment factor:
10 000
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
14.6 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
4.37 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.437 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
0.001 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

This substance is a member of the category of "Simple rhodium(III) substances". As such,

the data requirements for this substance are covered by relevant and reliable experimental test data generated for all members of this category via a read-across approach.

A read-across justification report and PNEC derivation report are attached in IUCLID Annex 13.

Conclusion on classification

Environmental classification for the soluble metal substances under consideration is based on the lowest acute and chronic threshold values from the Rh(III) ecotoxicity test data:

-chronic ERV: lowest chronic threshold value is 77 µg Rh/L (geometric mean EC10 value (growth rate) with P. subcapitata, based on the experimental results for rhodium trichloride hydrate (EC10 = 130 µg Rh/L; Schlich 2020) and diammonium sodium hexakis(nitrito-N) rhodate

(EC10=46 µg Rh/L; Wenzel 2015).

-acute ERV: lowest acute threshold value is 290 µg Rh/L with D. magna, based on the experimental results for dirhodium trichloride hydrate (Okamoto et al 2014).

The derivation of both ERV values is detailed in the read-across justification report (cfr. IUCLID Section 13) and PNEC derivation report (cfr. IUCLID Section 13).

For classification purposes, these ERVs have been recalculated to the values expressed as the concentration of the substance (conversion based on molecular weight conversion from soluble ion to the substance considered – cfr. details in below table). This classification for aquatic acute and chronic hazard (including M-factors) is shown in the below table. Acute and chronic M-factors are based on the value of the substance-specific acute and chronic ERV, as outlined in ECHA Guidance on the application of the CLP criteria (version 5.0; ECHA, 2017) - cfr. below table.

            Using Acute ERV Using Chronic ERV Using Acute ERV
  Molecular formula MW Rh (wt%) Acute ERV
(µg TI/L)		 Chronic ERV
(µg TI/L)		 Acute aquatic hazard acute M-factor Chronic aquatic hazard chronic M-factor Chronic aquatic hazard chronic M-factor
Dirhodium trisulphate Rh2(SO4)3 494 41,7 696,1 184,8 Aquatic Acute 1 M=1 Aq Chron 2   Aq Chron 1    
Rhodium trichloride,hydrate RhCl3.xH2O (with 1-3) 227,28 (monohydrate) – 263,31 (trihydrate)* 39,1 742,1 197,0 Aquatic Acute 1 M=1 Aq Chron 2   Aq Chron 1    
Rhodium acetate Rh(C2H3O2)3 280,04 36,7 789,2 209,6 Aquatic Acute 1 M=1 Aq Chron 2   Aq Chron 1    

* MWt of trihydrate used for further hazard assessment