On January 16, 10 impingers
were placed in a northsouth orientation along Van Eegan Road (Figure 1).
The samples of BHA solution from the impingers
were extracted three times with hexane in a separatory funnel to transfer the oximes in the hexane phase while the water-soluble compounds remained in the aqueous phase.
01 method, "Chilled Impinger
Method for Use at Wood Products Mills to Measure Formaldehyde, Methanol, and Phenol," where formaldehyde was analyzed via spectrophotometry using acetylacetone and methanol was analyzed via gas chromatography with a flame ionization detector.
The liquid impinger
sampling method was selected because it does not involve an extraction step during laboratory analysis, which allows the method to be used as a control against the variability seen during analysis when filter collection media are used in endotoxin recovery.
Dual sampling trains each containing three impingers
collected gas from a laboratory lumber dry kiln.
Three glass impingers
were each filled with 30 mL of brain heart infusion broth (BD Biosciences).
were in a stirred glycol solution maintained at -1[degrees]C.
Effect of sampling time on the collection efficiency of all-glass impingers
The sampling methods were changed so that the performance of the absorber was measured using a total hydrocarbon analyzer and two chilled impinger
Humidification of the control cell exposure chamber was achieved by passing medical-grade air from the gas cylinder through two midget impingers
in series (Ace Glass, Vineland, NJ), containing 15 mL HPLC-grade water (Fisher Scientific, Fairlawn, NJ).
are designed to operate by drawing aerosols through an inlet tube that is curved to simulate the nasal passage.
2002), additional emissions were reported with a list of approximately 70 compounds that were detected by capturing the compounds in impingers
and on adsorbants during drying at 100[degrees]C.
The mass of methanol and formaldehyde in the impingers
is determined from the concentrations detected in the water and quantity of water in the impingers
at the end of a sampling interval.
containing dilute NaOH in water were used to trap airborne PCP from air flowing through the test chamber over the treated sample.
sample of kiln exhaust was drawn through two midget impingers
in a glycol bath at -1[degrees]C (30[degrees]F).