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◆ Return to the country of origin
◆ Re-exported to another country if they will accept the shipment
◆ Destroy by incineration
Important
Before taking a reading, always purge sampling lines with a mechanical or
hand pump. After connecting the T/C unit to the sampling lead, always adjust
the gas flow rate to 1.0, and wait until the meter registering "ounces per
thousand cubic feet" stabilizes before taking a reading. (This may take a
minute or more, depending upon the length of the tubing and whether or not an
auxiliary pump is used.). If you’re using treatment schedule T101 or T401-a to
fumigate fresh fruit or vegetables, see “Special Procedures for Fruits,
Vegetables, or Perishable Commodities Using Schedule T101-a-1 or
Equivalent” on page-2-4-28.
5 If fumigating oak logs or lumber for export, see “Special Procedures for Adding Gas to Oak Logs and Lumber.”
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Conducting the Fumigation
2-4-22 Treatment Manual 03/2004-05
PPQ
Thirty Minute
Reading
The 30 minute reading shows the initial concentration and
distribution of gas. The 30 minute reading can indicate leakage,
sorption, incorrect dosage calculation, or error in fumigant
introduction—all of which require immediate attention. Concentration
readings should not differ more than 4 ounces among the leads.
Two Hour
Reading
In comparison with the 30 minute reading, the 2 hour reading also will
indicate if the tarpaulin is leaking or the commodity is sorbing gas.
Readings more than 15 percent lower than the 30 minute reading will
require close monitoring and possible corrective action.
EXAMPLE: Your dosage for the fumigation was 4 pounds (64 ounces).
The 30 minute reading was 50 ounces (3.125 pounds). The 2 hour
reading is 42 ounces (2.625 pounds). The 2 hour reading is more than
15 percent less than the 30 minute reading and would indicate that
either a leak or sorption problem may exist. You would need to
monitor the fumigation closely until the concentration level stabilizes.
Four, Six,
Twelve, or
Thirty-Six Hour
Reading
Not required if previous readings are satisfactory and experience with
similar fumigations indicate successful treatment can be expected. If
either the 4, 6, 12, or 36 hour reading is the final reading, then you
must take the reading. If you are unfamilar with the treatment
schedule, optional concentration readings may be necessary to ensure
a successful fumigation.
Final Reading The final reading is required for all tarpaulin fumigations in order to
determine if the fumigation has been successfully completed. You may
start the final reading before the finishing time of the treatment so
that aeration commences at the finishing time. Starting the final
reading before finishing time is especially critical when fumigating
perishables. Do not add gas after the final reading.
Additional
Readings
Decide the need to take additional readings based on the following:
◆ Rate of gas concentration decrease
◆ Any condition which could change the gas concentration such as
severe winds, or rain.
When concentration readings differ by more than 4 ounces, run the
fans to equalize the gas and record readings on the APHIS 429.
Generally, at the 1/2 hour reading, gas should be evenly distributed,
and you should not have to restart the fans unless you added gas.
Avoid using hand-held two-way radios near the T/C unit. Using two-way radios
near the T/C unit will interfere with an accurate concentration reading.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Conducting the Fumigation
03/2004-05 Treatment Manual 2-4-23
PPQ
Severe winds (30 mph or higher including any amount severe enough
to cause damage) are a good reason to take additional readings on an
outdoor fumigation. Any sharp or unusual decreases of the readings
in relation to previous readings is a clue to take corrective action and
supplementary readings. Take additional readings every 30 minutes
until problems are rectified. Adverse weather conditions may indicate
the need for additional readings.
Sorptive commodities may also require additional concentration
readings.
Step 4—Determining the Need to Add Gas and Adjust Exposure
Use the following table to determine when to add gas or extend the
exposure period:
Special Procedures for Adding Gas and Extending
Exposure Period
Adding Gas to Commodities that are Fumigated Using Treatment
Schedules other than T101-a-1 or Equivalent (may include
　
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