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EC number: 701-124-4
CAS number: -
The hydrolytic degradation of the MDI layer to insoluble polymerised
product (virtually 100%), with some evolution of CO2 in the early
stages, was observed. Neither MDI nor MDA (diaminodiphenylmethane, an
intermediate in the hydrolysis - cf section 5.1.2) was detectable in the
pond water at any stage (<0.005 mg/l), or was accumulated in the fish
(detection limits 0.36 mg/kg and 0.69 mg/kg respectively). The pH of the
treated ponds fell during the study, by ca 2.0 and 0.7 units for the
high and low dosed ponds respectively, this due to liberation of CO2
which also caused an increase in hardness. The biological and chemical
oxygen demand were not affected by either application rate of MDI.
Neither dose rate caused any direct effect on the pelagic community
(phytoplankton, zooplankton, fish, macrophytes) of the test ponds. Some
minor indirect effects caused by the production of CO2 were observed in
phyto- and zoo- plankton community structures and an increase in
macrophyte growth was noted (42% higher than control for the high dose
pond). Organisms living in sediment (macrobenthos) were affected by
physical obstructions in the habitat (e.g. the crust of hydrolysing MDI)
but regained densities equivalent to control after some weeks except for
Bivalvia which have too long a generation time for the test period.
Satisfactory homogeneous analysis of the sediment was rendered difficult
because test substance had spilt over onto the untreated sediment
layer.(This layer was actually covered by test substance in the high
dose pond). In consequence, relatively high concentrations of MDI were
detected in the high-dose pond sediment during the early stages of the
test (widely varying, up to 14.5 g/kg) but these declined throughout the
study, to ca 0.5 mg/kg. In the low-dose pond a mean concentration in
sediment of 5 mg/kg on day 7 declined to <= 0.5 mg/kg at the end of the
test. MDA was not detected in the sediment except on day 7, when 12
mg/kg for the high-dose pond and 7 mg/kg (one reading only) for the
low-dose pond were detected. (The detection limit was 0.3 mg/kg.)
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