phenylmethanesulfonic acid

SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), benzylsulfonic acid, which has an estimated vapor pressure of 3.4X10-6 mm Hg at 25 °C(SRC), determined from a fragment constant estimation method(2), will exist in both the vapor and particulate phases in the ambient atmosphere. Vapor-phase benzylsulfonic acid is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 65 hours(SRC), calculated from its rate constant of 6.0X10-12 cu cm/molecule-sec at 25 °C(SRC) determined using a structure estimation method(3). Particulate-phase benzylsulfonic acid may be removed from the air by wet and dry deposition(SRC).

Using a structure estimation method based on molecular connectivity indices(1), the Koc for benzylsulfonic acid can be estimated to be 21(SRC). According to a classification scheme(2), this estimated Koc value suggests that benzylsulfonic acid is expected to have very high mobility in soil.

NO PERMANENT ILL EFFECTS WERE OBSERVED IN RATS WHICH INHALED TSA-94/30, & VAPORS WERE CONSIDERED ONLY SLIGHTLY TOXIC.

An estimated BCF of 3 was calculated for benzylsulfonic acid(SRC), using an estimated log Kow of -0.67(1) and a regression-derived equation(2). According to a classification scheme(3), this BCF suggests the potential for bioconcentration in aquatic organisms is low.

The Henry's Law constant for benzylsulfonic acid is estimated as 1.0X10-9 atm-cu m/mole(SRC) using a fragment constant estimation method(1). This Henry's Law constant indicates that benzylsulfonic acid is expected to be essentially nonvolatile from water surfaces(2). Benzylsulfonic acid's Henry's Law constant(1) indicates that volatilization from moist soil surfaces will not occur(SRC). Benzylsulfonic acid is not expected to volatilize from dry soil surfaces(SRC) based upon an estimated vapor pressure of 3.4X10-6 mm Hg(SRC), determined from a fragment constant method(3).

The rate constant for the vapor-phase reaction of benzylsulfonic acid with photochemically-produced hydroxyl radicals has been estimated as 6.0X10-12 cu cm/molecule-sec at 25 °C(SRC) using a structure estimation method(1). This corresponds to an atmospheric half-life of about 65 hours at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm(1).

Benzylsulfonic acid has no reported statistics on production and use. If released to air, an estimated vapor pressure of 3.4X10-6 mm Hg at 25 °C indicates benzylsulfonic acid will exist in both the vapor and particulate phases in the ambient atmosphere. Vapor-phase benzylsulfonic acid will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals; the half-life for this reaction in air is estimated to be 65 hrs. Particulate-phase benzylsulfonic acid will be removed from the atmosphere by wet and dry deposition. If released to soil, Benzylsulfonic acid is expected to have very high mobility based upon an estimated Koc of 21. Volatilization from moist soil surfaces is not expected to be an important fate process based upon an estimated Henry's Law constant...