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EC number: 237-410-6
CAS number: 13775-53-6
The lowest NOEC-value at 7 months exposure to HF of highly sensitive plants species of 0.2 µg/m3 will be taken into consideration for the assessment of the atmospheric compartment.
high-temperature processes werealuminium
potassium fluoride is used,HF
may be formed, therefore a plant PNEC is developed based on HF. ThePNECplant-air
for HF is taken from the risk assessment of HF (EU, 2001). This value is
based on many experiments that are available in which a variety of
plants (bean, barley, corn, garden flowers, strawberries, pine, shrubs,
grass, rice, etc.) are exposed to HF in fumigation experiments. Gaseous
fluoride enters the leaves through the stomatal pores and causes foliar
injury (chlorosis, necrosis), decreased sugar and chlorophyll content,
respiration rate and ATPase activity. Reduced yield and smaller fruits
are also observed. Sensitive plants are tulip, gladiolus, fruit crops,
conifers and grasses, which are affected at concentrations ranging from
0.4 to 1.0 µg/m3 after exposure for several days.
On the basis of a
larger number of fumigation experiments with plants (ornamental crops,
fruit crops and conifers) exposed to HF, a relationship was derived
between the NOEC and exposure time (Slooff et al., 1989). In this report
NOEC-values were calculated with this formula for several exposure
NOEC-values have been calculated for highly sensitive, sensitive and
slightly sensitive plants. The Dutch Health Council (Gezondheidsraad,
1990) also gave NOEC-vales for all plant species and different exposure
periods (EU, 2001).
A compilation of these
NOEC-values is given in the Table below.
for HF (inµg/m3)
(3 month exp.)
Slooff et al. (1988)
The lowest NOEC-value
at 7 months exposure of highly sensitive plants species will be taken
into consideration for the derivation of the PNEC for the atmospheric
information is taken into account for toxicity on terrestrial plants for
the derivation of PNEC:
The lowest NOEC-value
at 7 months exposure to HF of highly sensitive plants species of 0.2
µg/m3 will be taken into consideration for the assessment of the
PNEC plant-air: 0.2 µg/m3
Because of the size and the diversity of the dataset and the character of the experimental setup the application of an assessment factor is considered not to be necessary.
Because of the size
and the diversity of the dataset and the character of the experimental
setup the application of an assessment factor is considered not to be
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