Значение и использование

This test method is intended to measure volatile extractables that may be emitted from a microwave susceptor material during use. It may be a useful procedure to assist in minimizing the amount of volatile extractables either through susceptor design or manufacturing processes.

Modification of this procedure by utilizing appropriate qualitative GC detection such as a mass spectrometer in place of the flame ionization detector may provide identification of volatile extractables of unknown identity.

Область применения

1.1 This test method covers complete microwave susceptors.

1.2 This test method covers a procedure for quantitating volatile compounds whose identity has been established and which are evolved when a microwave susceptor sample is tested under simulated use conditions.

1.3 This test method was collaboratively evaluated with a variety of volatile compounds (see statistical evaluation). For compounds other than those evaluated, the analyst should determine the sensitivity and reproducibility of the method by carrying out appropriate spike and recovery studies. The analyst is referred to Practice E 260 for guidance.

1.4 For purposes of verifying the identity of or identifying unknown volatile compounds, the analyst is encouraged to incorporate techniques such as gas chromatography/mass spectroscopy, gas chromatography/infrared spectroscopy, or other techniques in conjunction with this test method.

1.5 A sensitivity level of approximately 0.025 μg/in. is achievable for the compounds studied in Table 1. Where other compounds are being quantitated and uncertainty exists over method sensitivity, the analyst is referred to Practice E 260 for procedures on determining sensitivity of chromatographic methods.

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

1.7 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. Specific safety hazards warnings are given in 10.2, 11.1, and 11.6.

TABLE 1 Analyte Recovery Without Microwaving

Compound(n)^ARecovery Mean, %Within Laboratory Variability, %Overall Variability, %Note(s)^B Benzene 5 97.7 7.8 9.0 2-Butoxy-ethanol4 98.7 6.7 8.41 Dibutyl Ether5109.716.5 23.7 Dodecane3101.110.7 10.71, 2 2-Furfural4 99.711.7 12.01 Furan-
2-Methanol3 100.014.116.41, 3 Isobutyl Alcohol4 96.0 7.1 7.94 Methylene
Chloride5 103.516.722.6 2-Propanol3 99.911.4 12.04 Styrene 5100.8 8.5 9.3 Toluene 4102.7 9.910.94 Overall101.1 11.614.4

^A n = number of laboratories submitting data on compound.

^B Notes: Collaborating laboratories provided the following reasons for not sub-
mitting data on a particular analyte:

1. The analyst felt interaction was occurring among various analytes and spent several days investigating. The laboratory manager refused to allow additional time for collaborative study.

2. The analyst questioned the solubility of the analyte and did not add to the spike mixture.

3. A fresh standard was not prepared fresh daily. This compound degrades measurably in water in 24 h.

4. The analyst experienced coelution of peaks under conditions of collaborative study on his/her particular system.