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EC number: 203-838-7
CAS number: 111-14-8
An OECD 208 GLP study was conducted on 6 plant species from 6 different families, respecting the ratio 4 dicotyledonous for 2 monocotyledonous. No biologically significant effect were seen on emergence, survival or phytotoxicity. However, heptanoic acid reduced the growth of 4 species. Brassica rapa was by far the most sensitive species. The EC10 considered for risk assessment is 1.2 mg/kg soil dry weight.
The long-term toxicity of heptanoic acid to plants was investigated
through an OECD 208 GLP study and using 6 different plant species (4
dicotyledonous and 2 monocotyledonous) from 6 different plant families
representing an area as wide as possible across the phylogenetic
distribution of the plant kingdom. The 6 species were Brassica rapa
(Brassicaceae), Lactuca sativa (Asteraceae), Beta vulgaris
(Amaranthaceae), Glycine max (Fabaceae), Allium cepa
(Liliaceae) and Lolium perenne (Poaceae). The nominal tested
concentrations tested were 0 ; 0.3 ; 1 ; 3 ; 10 ; 30 ; 100 mg/kg soil
(dry weight) for all plant species. Thirty seeds per treatment and per
species were used. The experiment for the dicotyledonous species was
carried out in decaplicate (10 independent pots per treatment) while it
was carried out in hexaplicate for the monocotyledonous plants. During
the 21 days incubation, seedling emergence, plant mortality and
phytotoxicity were recorded. After 21 days incubation (end of the test),
the dry weight of shoot per pot was measured. There were no biologically
significant effect of heptanoic acid on emergence, survival and
phytotoxicity in any species. There were however an inhibitory effect of
heptanoic acid on plant growth (as measured by shoot dry weight) on Beta
vulgaris, Brassica rapa, Lactuca sativa and Lolium
perenne. The most sensitive species was by far Brassica rapa,
with an EC10 of 1.2 mg/kg soil dry weight (based on initially measured
concentrations in soil).
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