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EC number: 231-176-9
CAS number: 7440-67-7
study, tomato and pea seedlings (ca. 21 days old) were exposed for 7
days to two different soils contaminated with either a soluble Zr
compound (ZrOCl2 or Zr acetate) or an insoluble Zr 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 highest unbound NOEC was >= 703.4 mg Zr/kg dw for
the acidic soil (417.4 mg Zr/kg background) and the lowest unbound NOEC
was >= 450 mg Zr/kg dw for the calcareous soil (164 mg Zr/kg
background), both soils amended with 286 mg Zr/kg Zr(OH)4.
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