Methyl
mercaptan market is anticipated to gain a sizeable market share owing to high
scale utilization in methionine synthesis. It is also widely used as an
intermediate in manufacturing jet fuels, plastics and pesticides. The market
for methyl mercaptan is expected to propel as it is found in vast variety of
vegetables including onions & garlic, petroleum distillates, coal tar and
sour gas used in oil fields. It occurs as a metabolite in human body for
degradation of methionine and various other compounds.
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Methyl mercaptan market faces a tuff challenge as it depresses the
nervous system & respiratory system as the same way hydrogen sulfide does
thereby causing respiratory paralysis and death. This may eventually lead to
exposure of which clinical signs are mucous membrane and ocular irritation. It
also causes nausea, staggering gait, headache, irritation and dizziness. Also
observed is the paralysis of pulmonary edema and locomotor muscles. Its primary
mechanism is observed in culmination with cytochrome oxidase.
Technological advancements and capital investments are initiated
by the manufacturers to regulate the odor awareness. Initially no values were
recommended to derive AEGL-1 values. For methyl mercaptan the level of distinct
odor awareness (LOA) is 0.0019 ppm. LOA great helps chemical emergency
respondents in measuring the awareness of exposure on odor perception among the
public. Advancements lead to the reduction of AEGL-2 values to AEGL-3 values.
These calculations are defined thresholds to monitor the inability to escape
and are apt owing to the steep concentration response proximity for lethality.
AEGL 3 values were calculated on 4-h LC01 which 1% lethality.
Uncertainty interspecies factor of 3 was deployed that considered sufficient
attributing to the steepness of lethality concentration response relationship.
It basically implies defined and limited individual variability. At times
interspecies uncertainty factor of 10 is applied due to limited data. Mostly
AEGL 3 values calculated with larger factor proves inconsistent with total
database. Range of AEGL 3 values is defined from 7.3 ppm to 40 pp incase the
total uncertainty factor is 30. It is highly unlikely that the people when
exposed to methyl mercaptan in this range for apporx 11 hours would witness any
lethal effects.
Additionally, utilization of uncertainty factor 30 will yield AEGL
3 values 2 to 4 fold less than AEGL 3 values defined for hydrogen sulfide.
Hydrogen sulfide possess a robust database which is attributed to the data that
suggest that methyl mercapatan is less harmful and toxic than hydrogen sulfide.
Also it would be highly inconsistent with total data set to enhance AEGL 3
values of methyl mercaptan which are less than AEGL 3 values defined for
hydrogen sulfide. The concentration exposure time relationship stated for
various irritant & systematically operating vapors. The gases are
essentially defined by the equation Cn * t = k, where the value exponent ranges
from 0.8 to 3.5.
To derive protective and conservative AEGL values in the lack of
any chemical-specific exponent, basically temporal scaling is initiated using
default values of n = 3. This is used for extrapolating from longer to shorter
durations such as 10 min, 30 min, and 1 h also n is defined with the value of 1
when extrapolating from shorter to longer durations 8 h. Methyl mercaptan
eventually also play a role in offering the toxic effects of fatty acids and
ammonia in patients having chronic sever liver diseases.
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