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hours aeration for all sorptive commodities.
4. Take concentration readings with colorimetric tubes in the
exhaust duct 2 feet within the enclosure. Record your readings
on PPQ Form 429. Take successive readings within the enclosure
4 feet from the floor, at two representative locations. Take the
readings between the cartons, but not inside the cartons.
After the fumigator takes the concentration reading, you must record
the date, concentration reading, and time in Block 39 of PPQ Form
429. Then use Table 2-4-17 to determine when to release the
commodity.
Outdoors Advise the fumigator to:
1. Complete installation of exhaust duct and begin exhaust fan.
2. Lift both ends of the tarpaulin that are furthest from exhaust fan.
3. Start the circulation and air introduction fans. Sorptive
commodities generally require 12 hours or longer to aerate. Since
sorptive commodities vary in their rates of desorption, aeration
may be completed in less than 12 hours. Require a minimum of 4
hours aeration for all sorptive commodities.
4. Remove the tarpaulin after 4 hours aeration.
TABLE 2-4-17: Determine when to Realease the Commodity
If the gas
concentration
level is: Then:
5 ppm or less 1. ADVISE fumigator to REMOVE the tarpaulin, and
2. RELEASE the commodity
6 ppm to 99 ppm 1. HAVE fumigator REMOVE the tarpaulin, and
2. CONTINUE aeration until the concentration is 5 ppm or less, then
3. RELEASE the commodity
100 ppm or above 1. CONTINUE aeration and take concentration readings until the
concentration level is below 100 ppm, then remove the tarpaulin,
and
2. CONTINUE aeration until concentration is 5 ppm or less, then
3. RELEASE the commodity
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Aerating Sorptive Commodities in Containers—Indoors and Outdoors
2-4-40 Treatment Manual 03/2004-05
PPQ
5. Stop the circulation fans and take concentration readings with
colorimetric tubes 4 feet from the ground and 1 foot inside the
outer edge of the stack between the cartons but not inside the
cartons. One location is sufficient.
After the fumigator takes the concentration reading, you must record
the date, concentration reading, and time in Block 39 of PPQ Form
429. If you are not at the fumigation site, have the fumigator call and
give you the information. Then use Table 2-4-18 to determine when to
release the commodity.
TABLE 2-4-18: Determine when to Realease the Commodity
If the gas concentration level is: Then:
5 ppm or less RELEASE the commodity
6 ppm or more 1. CONTINUE aeration and take concentration
readings until the level is 5ppm or less, then
2. RELEASE the commodity
10/2002-04 Treatment Manual 2-5-1
PPQ
Treatment Manual
2 Chemical Treatments 5
Fumigants • Methyl Bromide •
Chamber Fumigation
Contents
Methods and Procedures page-2-5-2
Conducting the Fumigation page-2-5-2
Step 1—Selecting a Treatment Schedule page-2-5-2
Step 2—Determining Section 18 Exemptions and Sampling Requirements
page-2-5-2
Step 3—Measuring the Temperature page-2-5-3
Step 4—Calculating the Dosage page-2-5-3
Step 5—Conducting the Fumigation page-2-5-4
Aerating the Chamber page-2-5-4
Normal Atmospheric Pressure Chamber—Aerating Noncontainerized Cargo
page-2-5-5
Step 1—Securing the Area page-2-5-5
Step 2—Aerating the Chamber page-2-5-5
Step 3—Taking Concentration Readings page-2-5-5
Normal Atmospheric Pressure Chamber—Aerating Containerized Cargo page-2-5-6
Step 1—Securing the Area page-2-5-6
Step 2—Aerating the Chamber page-2-5-6
Step 3—Taking Concentration Readings page-2-5-6
Vacuum Fumigation Chambers—Aerating Containerized and Noncontainerized Cargo
page-2-5-6
Step 1—Securing the Area page-2-5-6
Step 2—Aerating the Chamber page-2-5-7
Step 3—Taking Concentration Readings page-2-5-7
Chemical Treatments Fumigants • Methyl Bromide • Chamber Fumigation
Methods and Procedures
2-5-2 Treatment Manual 10/2002-04
PPQ
Methods and Procedures
Materials Needed
The procedures covered in this section provide commercial fumigators
with the methods, responsibilities, and precautions for chamber
fumigation.
◆ Colorimetric tubes (Draeger, Kitagawa, or equivalent)1
◆ Halide leak detector1
◆ Methyl bromide
◆ Scale or graduated cylinder for volume (liquid measurements)
◆ SCBA or supplied air respirator1
◆ Thermal conductivity (T/C) unit
◆ Thermometer1
◆ Volatilizer
　
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