O-XYLENE

1,2-Dimethylbenzene

1,2-Xylene

95-47-6

Ortho-Xylene

Xylene

o-Xylol

o-Methyltoluene

2-Xylene

o-Dimethylbenzene

Benzene, 1,2-dimethyl-

3,4-Xylene

1,2-Dimethylbenzol

o-Xylenes

Xylene, o-

Dimethylbenzene

Benzene, o-dimethyl-

2-Methyltoluene

orthoxylene

NSC 60920

Benzene, dimethyl-

DTXSID3021807

CHEBI:28063

NSC-60920

o-Xylene-dimethyl-13C2

P-XYLENE-A,A,A-D3

1,2-XYLOL

BENZENE,1,2-DIMETHYL

CHEMBL45005

DTXCID501807

Z2474E14QP

MFCD00008519

68411-84-7

CCRIS 905

HSDB 134

EINECS 202-422-2

UNII-Z2474E14QP

dimethyl benzene

dimethyl-benzene

AI3-08197

Xylenes ACS

Xylene, o-isomer

1,2-dimethyl-benzene

o-Xylene, HPLC Grade

O-XYLENE [MI]

2-XYLENE [HSDB]

bmse000526

EC 202-422-2

o-Xylene, anhydrous, 97%

o-Xylene, analytical standard

o-Xylene, for HPLC, 98%

WLN: 1R B1

o-Xylene, for synthesis, 98%

DTXSID10178042

188l

o-Xylene, Spectrophotometric Grade

NSC60920

o-Xylene 10 microg/mL in Methanol

Tox21_200658

BDBM50008560

STL264206

o-Xylene 100 microg/mL in Methanol

AKOS000269058

o-Xylene, reagent grade, >=98.0%

MCULE-2208963094

CAS-95-47-6

NCGC00091662-01

NCGC00091662-02

NCGC00091662-03

NCGC00258212-01

o-Xylene, spectrophotometric grade, 98%

BS-20678

o-Xylene [UN1307] [Flammable liquid]

o-Xylene, SAJ special grade, >=98.5%

DB-257286

NS00007915

S0650

X0012

EN300-25617

o-Xylene, puriss. p.a., >=99.0% (GC)

C07212

Q2988108

F1908-0112

InChI=1/C8H10/c1-7-5-3-4-6-8(7)2/h3-6H,1-2H

o-Xylene, Pharmaceutical Secondary Standard; Certified Reference Material

Xy

The Henry's Law constant for 2-xylene has been measured as 5.18X10-3 atm-cu m/mole(1). This Henry's Law constant indicates that 2-xylene is expected to volatilize rapidly from water surfaces(2). Based on this Henry's Law constant, the volatilization half-life from a model river (1 m deep, flowing 1 m/sec, wind velocity of 3 m/sec)(2) is estimated as 3.2 hours(SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec)(2) is estimated as 4.1 days(SRC). 2-Xylene's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). 2-Xylene is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 6.65 mm Hg at 25 deg C(3).
Literature: (1) Sanemasa I et al; Bull Chem Soc Jpn 18: 1111-230 (1982) (2) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 15-1 to 15-29 (1990) (3) Daubert TE, Danner RP; Physical and Thermodynamic Properties of Pure Chemicals: Data Compilation. Design Institute for Physical Property Data, American Institute of Chemical Engineers. New York, NY: Hemisphere Pub Corp (1996)

Koc values measured for 2-xylene in various soils (% organic matter) were 24 in Wendover silty clay (16.2%), 26 in Vaudreil sand loam (10.0%), 68 in St. Thomas sand (3.1%), and 138 in Grimsby silt loam (1.0%)(1). Batch adsorption tests, using three solid sandy aquifer materials gave a Koc of 129(2). The Koc for 2-xylene in surface sediments collected from the central Tamar estuary in the UK was 25.4(3). The Koc values for 2-xylene in two river sediments (% organic matter 6.5-16.9 wt%) was 209 and 251, respectively(4). According to a classification scheme(5), these measured Koc values suggests that 2-xylene is expected to have very high to moderate mobility in soil. Using OECD Guideline 121 (estimating Koc via HPLC), the Koc of 2-xylene was estimated to be 537(6). Concentration enhancement has been observed for 2-xylene in a dune-infiltration project on the Rhine River(7); however, no 2-xylene reached groundwater under a rapid infiltration site(8). The log Koc for 2-xylene in coal sediment (% organic matter 52 wt%) was 2.40(4).
Literature: (1) Nathwani JS, Phillip CR; Chemosphere 6: 157-62 (1977) (2) Abdul AS, Gibson TL, Rai DN; S Haz Waste Haz Mat 4: 211-22 (1987) (3) Vowles PD, Mantoura RFC; Chemosphere 16: 109-16 (1987) (4) Kopinke FD et al; Environ Sci Technol 29: 941-50 (1995) (5) Swann RL et al; Res Rev 85: 17-28 (1983) (6) ECHA; Search for Chemicals. o-Xylene (CAS 95-47-6) Registered Substances Dossier. European Chemical Agency. Available from, as of June 20, 2015: http://echa.europa.eu/ (7) Piet GJ et al; Quality of groundwater. Van Dwjvenbooden W et al, eds; Studies in Environ Sci 17: 557-64 (1981) (8) Tomson MB et al; Water Res 15: 1109-16 (1981)