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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

In the key study of Ferrand et al. (2006) no adverse effects were observed when exposing tomato and pea seedlings either to soluble zirconium compounds (zirconium dichloride oxide or zirconium acetate) or insoluble zirconium compounds (zirconium hydroxide) added to soil. Only unbound NOEC values were obtained.

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Additional information

A single study was identified containig relevant and reliable information on toxicity of zirconium substances to terrestrial plants. In this study (Ferrand et al., 2006), tomato and pea seedlings (ca. 21 days old) were exposed for 7 days to two different soils contaminated with either a soluble zirconium compound (ZrOCl2 or zirconium acetate) or an insoluble zirconium compound (Zr(OH)4). In none of the experiments adverse effects were observed on root or shoot fresh weight of the plants. Unbound NOEC values were obtained for all experiments. The lowest unbound NOEC was >= 264 mg Zr/kg dw for the calcareous soil (164 mg Zr/kg background) amended with 100 mg Zr/kg ZrOCl2 or Zr acetate. The highest unbound NOEC was >= 703.4 mg Zr/kg dw for the acidic soil (417.4 mg Zr/kg background) amended with 286 mg Zr/kg Zr(OH)4.