4.3 Analysis. Record the data required on the example sheet shown in Figure 5-3. Handle each sample container as follows:

Container No. 1. Transfer the filter and any loose particulate matter from the sample container to a tared glass weighing dish, desiccate, and dry to a constant weight. Report results to the nearest 0.5 mg.

Container No. 2. Transfer the acetone washings to a tared beaker and evaporate to dryness at ambient temperature and pressure. Desiccate and dry to a constant weight. Report results to the nearest 0.5 mg.

Container No. 3. Weigh the spent silica gel and report to the nearest gram.

V1, Total volume of liquid collected in impingers and silica gel (see Figure 5-3), ml.

pit,o= Density of water, 1 g./ml. Mн,0=Molecular weight of water, 18 lb./

lb.-mole.

R= Ideal gas constant, 21.83 inches Hg cu. ft./lb.-mole-°R.

T std

Patd

6.4

Pbart

ΔΗ 13.6

=

Pstd

Pbar+

ΔΗ 13.6

where: Bwo

Vw.

Tm

equation 5-1

Ꭱ

Rg)

m

in. Hg,

=

=

Absolute temperature at standard conditions, 530° R.

Absolute pressure at standard conditions, 29.92 inches Hg.

Proportion by volume of water vapor in the gas stream, dimensionless.

Watd=Volume of water in the gas sample (standard

conditions), cu. ft.

I=Percent of isokinetic sampling. Vie-Total volume of liquid collected in impingers and silica gel (See Fig. 5-3), ml. PH20=Density of water, 1 g./ml.

R=Ideal gas constant, 21.83 inches Hg-cu. ft./lb. mole-°R.

Mн,0=Molecular weight of water, 18 lb./lb.-mole. Vm=Volume of gas sample through the dry gas meter (meter conditions), cu. ft.

TmAbsolute average dry gas meter temperature (see Figure 5-2), °R.

=

Pbar Barometric pressure at sampling site, inches Hg.

AH-Average pressure drop across the orifice (see Fig. 5-2), inches H2O.

T. Absolute average stack gas temperature (see Fig. 5-2), °R.

0 Total sampling time, min.

V. Stack gas velocity calculated by Method 2,
Equation 2-2, ft./sec.

P. Absolute stack gas pressure, inches Hg.
An Cross-sectional area of nozzle, sq. ft.

Addendum to Specifications for Incinerator Testing at Federal Facilities, PHS, NCAPC, Dec. 6, 1967.

Martin, Robert M., Construction Details of Isokinetic Source Sampling Equipment, Environmental Protection Agency, APTD-0581.

Rom, Jerome J., Maintenance, Calibration, and Operation of Isokinetic Source Sampling Equipment, Environmental Protection Agency, APTD-0576.

Smith, W. S., R. T. Shigehara, and W. F. Todd, A Method of Interpreting Stack Sampling Data, Paper presented at the 63d Annual Meeting of the Air Pollution Control Association, St. Louis, Mo., June 14-19, 1970. Smith, W. S., et al., Stack Gas Sampling Improved and Simplified with New Equipment, APCA paper No. 67-119, 1967.

Specifications for Incinerator Testing at Federal Facilities, PHS, NCAPC, 1967.

METHOD 6-DETERMINATION OF SULFUR DIOXIDE EMISSIONS FROM STATIONARY SOURCES

1. Principle and applicability.

1.1 Principle. A gas sample is extracted from the sampling point in the stack. The acid mist, including sulfur trioxide, is separated from the sulfur dioxide. The sulfur dioxide fraction is measured by the bariumthorin titration method.

1.2 Applicability. This method is applicable for the determination of sulfur dioxide emissions from stationary sources only when specified by the test procedures for determining compliance with New Source Performance Standards.

2. Apparatus.

2.1 Sampling. See Figure 6–1.

2.1.1 Probe-Pyrex1 glass, approximately 5 to 6 mm. ID, with a heating system to prevent condensation and a filtering medium to remove particulate matter including sulfuric acid mist.

2.1.2 Midget bubbler-One, with glass wool packed in top to prevent sulfuric acid mist carryover.

2.1.3 2.1.4

Glass wool.

Midget impingers-Three.

2.1.5 Drying tube-Packed with 6 to 16 mesh indicating-type silica gel, or equivalent, to dry the sample.

2.1.6 Valve-Needle valve, or equivalent, to adjust flow rate.

2.1.7 Pump-Leak-free, vacuum type. 2.1.8 Rate meter-Rotameter or equivalent, to measure a 0-10 s.c.f.h. flow range.

2.1.9 Dry gas meter-Sufficiently accurate to measure the sample volume within 1%. 2.1.10 Pitot tube-Type S, or equivalent, necessary only if a sample traverse is required, or if stack gas velocity varies with time.

4.1.1 Preparation of collection train. Pour 15 ml. of 80% isopropanol into the midget bubbler and 15 ml. of 3% hydrogen peroxide into each of the first two midget impingers. Leave the final midget impinger dry. Assemble the train as shown in Figure 6-1. Leak check the sampling train at the sampling site by plugging the probe inlet and pulling a 10 inches Hg vacuum. A leakage rate not in excess of 1% of the sampling rate is acceptable. Carefully release the probe inlet plug and turn off the pump. Place crushed ice around the impingers. Add more ice during the run to keep the temperature of the gases leaving the last impinger at 70° F. or less.

4.1.2 Sample collection. Adjust the sample flow rate proportional to the stack gas velocity. Take readings at least every five minutes and when significant changes in stack conditions necessitate additional adjustments in flow rate. To begin sampling, position the tip of the probe at the first sampling point and start the pump. Sample proportionally throughout the run. At the conclusion of each run, turn off the pump and record the final readings. Remove the probe from the stack and disconnect it from the train. Drain the ice bath and purge the remaining part of the train by drawing clean ambient air through the system for 15 minutes.

4.2 Sample recovery. Disconnect the impingers after purging. Discard the contents of the midget bubbler. Pour the contents of the midget impingers into a polyethylene shipment bottle. Rinse the three midget impingers and the connecting tubes with dis