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REACH

Molybdenum sulfide

EC number: 235-721-1 | CAS number: 12612-50-9

Life Cycle description
Uses advised against

Ecotoxicological information

Short-term toxicity to fish

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Administrative data

Link to relevant study record(s)

Description of key information

Four reliable data points were identified, representing two different fish species (Oncorhynchus mykiss and Pimephales promelas). Values ranged between 609.1 mg Mo/L and 1,339 mg Mo/L The lowest reliable acute value is a 96h-LC50 of 609.1 mg Mo/L for the fish P. promelas (GEI, 2009), using sodium molybdate dihydrate as test substance. This value is put forward for classification purposes.

Key value for chemical safety assessment

Fresh water fish

Effect concentration:: 609.1 mg/L

Additional information

The reliable acute toxicity concentration levels for sodium molybdate are summarized below. Effect levels are expressed as (mg Mo)/L

Species	Mo-salt	Endpoint		mg Mo/L	pH	Reference
O. mykiss	Na₂MoO₄.2H₂O	96h-LC₅₀	Nominal	3014	6.7	HRC, 1994
O. mykiss, 55 mm	Na₂MoO₄.2H₂O	96h-LC₅₀	Nominal	1339	7.0	McConnell, 1977
O. mykiss 20 mm	Na₂MoO₄.2H₂O	96h-LC₅₀	Nominal	781	7.0	McConnell, 1977
P. promelas	Na₂MoO₄.2H₂O	96h-LC₅₀	Measured	609.1 681.4	8.05	Canton et al, 2006

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