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Toxicity to terrestrial arthropods

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Only one reliable (Klimisch 2) result is available for the effect of Na2SeO4 to reproduction of the terrestrial arthropod Folsomia candida, reporting a NOEC of 2.35 mg Se/kg soil (calculated as EC20/2, based on added Se concentration; Checkai et al., 2004). No results were available for the effect of selenite on terrestrial arthropods. Because of the significant difference in toxicity between selenite and selenate in the terrestrial ecosystem, data for selenate could not be used for the hazard assessment of selenite. According to Annex IX and X, of Regulation (EC) 1907/2006, there is no requirement for toxicity data for both terrestrial arthropods and other soil macro-organisms. Because reliable data are available for other terrestrial macro-organisms, there is no requirement for further tests on toxicity of selenite to terrestrial arthropods.