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EC number: 204-424-9
CAS number: 120-78-5
Although MBTS is not readily biodegradable with a biodegradability of 0%
observed in 28 days (Bayer, 1988) and hydrolytically stable under
environmentally relevant pH and temperature (Hasson & Agrup, 1993), it
is photolytically unstable in water with a half-life of direct
phototransformation in water of 3 hours (Monsanto, 1980).
The main abiotic degradation products of MBTS and its reductive product
MBT are BT (CAS: 95-16-9) and BTon (CAS: 934-34-9). In the EU-Risk
Assessment, BT and BTon are reported as persistent under environmental
conditions. Another described metabolite from MBT is MeSBT, which is
also reported as resistant both to biodegradation and photolysis.
MBTS is not bioaccumulative with the highest observed BCF of 51 at
concentration of 0.2 mg/l (MITI, 1992). All the potential metabolites of
MBTS are also not bioaccumulative. However, MBTS has a high adsorption
potential in soil/sludge with the estimated adsorption coefficient (log
Koc) of 3.72 - 5.75 (Currenta, 2010). The adsorption coefficients of the
potential metabolites of MBTS distribute also in the same range as the
one of MBTS. Only BTon (estimated log Koc of 1.93) has very low
MBTS is essentially non-volatile with the estimated Henry's law constant
of 2.37*10-8 hPa m3/mol at 25°C (Currenta, 2010).
All the potential metabolites of MBTS have a HLC lower than 1 Pa m3/mol
and hence are considered as non-volatile. MBTS has a half-life in air of
1.22 h estimated by AOPWIN v1.92 with a rate constant of 3.15 *10-10
cm3/(molecule*sec), considering an OH-concentration of
500,000 radicals/cm³. The estimated half-life in air of MBTS is much
shorter than 48 hours and hence no potential for long-range transport of
MBTS in air is expected.
The distribution of MBTS in a "unit world" was calculated according to
the Mackay fugacity model level I (Currenta, 2010) based on the
physico-chemical properties. The main target compartment for MBTS is
soil with 41.34 % and sediment with 41.80 %, followed by water with
16.53% and suspended sediment with 0.27%.
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