ASTM

ASTM D7057-09 82 PDF Download

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1.1 This test method covers the determination of the purity of isopropylbenzene (cumene) by gas chromatography. Calibration of the gas chromatography system is done by the external standard calibration technique.

1.2 This test method has been found applicable to the measurement of impurities such as nonaromatic hydrocarbons, benzene, toluene, ethylbenzene, phenol, cymenes, t-butylbenzene, n-butylbenzene, n-propylbenzene, alpha-methylstyrene, sec-butylbenzene, and diisopropylbenzenes, which are impurities that can be found in isopropylbenzene. The latter impurities can be analyzed over a range of 1 mg/kg to 500 mg/kg by this method (see Table 1). The limit of detection for these impurities is summarized in Table 1 as well.

1.3 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E 29.

1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 8.

TABLE 1 Summary of Precision Data (mg/kg)

Compound Repeatability Reproducibility Range
Studied
Benzene 1.004+0.006*Benzene 0.924+0.158*Benzene 1.0–295
Toluene 0.644+0.009*Toluene 1.505+0.069*Toluene 0.2–260
Ethylbenzene (EB) 1.249+0.022*EB 2.534+0.230*EB 5–370
n-Propylbenzene (NPB) -0.369+0.015*NPB -6.793+0.214*NPB 180–465
Phenol (PHE) 1.926+.0095*PHE 3.718+0.207*PHE 1–225
alpha-methylstyrene(AMS) 1.368+0.057*AMS 21.181+0.976*AMS 6–305
tert-Butylbenzene(TBB) 1.666+0.011*TBB 4.126+0.086*TBB 2–250
sec-Butylbenzene(SBB) 0.635+0.010*SBB 0.891+0.090*SBB 2–245
m-Cymene 0.618+0.011*m-Cymene 1.811+0.181*m-Cymene 5–240
o-Cymene 0.498+0.012*o-Cymene 1.951+0.156*o-Cymene 1–160
p-Cymene 0.485+0.019*p-Cymene 1.618+0.097*p-Cymene 2–270
n-Butylbenzene(NBB) 0.445+0.030*NBB 2.600+0.045*NBB 0.3–265
1,3-diisopropylbenzene(13DIPB) 0.727+0.010*13DIPB 1.570+0.720*13DIPB 1–210
1,4-diisopropylbenzene(14DIPB) 0.435+0.013*14DIPB 1.112+0.040*14DIPB 1–285
NonAromatics(NA) 0.441+0.242*NA 1.663+0.306*NA 5–95

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Published:
06/01/2009
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