ASTM International - ASTM D6144-12

Standard Test Method for Analysis of AMS (α-Methylstyrene) by Capillary Gas Chromatography

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Organization:	ASTM International
Publication Date:	1 December 2012
Status:	inactive
Page Count:	5
ICS Code (Physicochemical methods of analysis):	71.040.50

significance And Use:

5.1 This test method is suitable for setting specifications on the materials referenced in 1.2 and for use as an internal quality control tool where AMS is produced or is used in a manufacturing... View More

scope:

1.1 This test method covers the determination of the purity of AMS (α-methylstyrene) 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 cumene, 3-methyl-2-cyclopentene-1-one, n-propylbenzene, tert-butylbenzene, sec-butylbenzene, cis-2-phenyl-2-butene, acetophenone, 1-phenyl-1-butene, 2-phenyl-2-propanol, trans-2-phenyl-2-butene, m-cymene, p-cymene, and phenol, which are common to the manufacturing process of AMS. The method has also been found applicable for the determination of para-tertiary-butylcatechol typically added as a stabilizer to AMS. The impurities in AMS can be analyzed over a range of 5 to 800 mg/kg by this method. (See Table 1.) The limit of detection for these impurities is typically in the range of 5 to 10 mg/kg. (See Table 1.)

TABLE 1 Summary of Precision Data (mg/kg)

Compound	Repeatability ( r)	Reproducibility ( R)	Range Studied

Acetone	1.61 + 0.035*Acetone	0.47 + 1.10*Acetone	0.5 - 26
Cumene	−0.46 + 0.031*Cumene	7.88 + 0.19*Cumene	45 - 290
nPropylbenzene (NPB)	2.11 + 0.03*NPB	−7.81 + 0.37*NPB	55 - 195
Phenol	1.84	3.65 + 0.58*Phenol	1 - 40
tertButylbenzene (TBB)	−1.22 + 0.035*TBB	3.63 + 0.087*TBB	150 - 650
secButylbenzene (SBB)	4.23 + 0.019*SBB	21.60 + 0.25*SBB	200 - 765
mCymene	0.31 + 0.035*mCymene	2.34 + 0.35*mCymene	2 - 50
oCymene	1.63	8.00	29 - 31
pCymene	5.12	15.79	10 - 18
cis-2-Phenyl-2-Butene (CPB)	0.17 + 0.030*CPB	5.39 + 0.11*CPB	50 - 225
trans-2-Phenyl-2-Butene (TPB)	1.57	0.54 + 0.20*TPB	19 - 70
1-Phenyl-1-Butene (PB)	4.00 + 0.018*PB	0.17 + 0.19*PB	0.2 - 735
Acetophenone (AP)	-1.09 + 0.15*AP	1.17 + 0.63*AP	15 - 115
para-tert-Butylcatechol (PTBC)	2.21	17.82	10 - 19
2-Methylbenzofuran (MBF)	0.33 + 0.76*MBF	0.75 + 0.60*MBF	1 - 2
2-Phenylpropion aldehyde (PPA)	0.59 + 0.11*PPA	0.29 + 0.23*PPA	1.5 - 15
α-Methylstyrene Oxide (AMSO)	4.61	6.51 + 0.23*AMSO	13 - 32
DimethylBenzyl Alcohol (DMBA)	0.38	0.55 + 2.03*DMBA	0.1 - 1

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 E29.

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 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.