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practical way must not be corrected by the addition of MB. "Quickly
evacuate remaining gas from the container, eliminate the problem,and
start a new treatment
Important
T101-a-1 or equivalent treatment schedules are those schedules that are not
greater than 2 hours long (exposure time), and the dosage rate is not greater
than 4lbs per 1000ft3.
To avoid injuring the commodity, add fumigant using the following formula:
1.6 × number of oz. below minimum × vol/1,000 = oz. of gas to add
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Special Procedures for Adding Gas and Extending Exposure Period
2-8-18 Treatment Manual 10/2002-04
PPQ
Extending the Exposure Period for Food, Nonfood, Feed, or
Nonfeed Commodities
Use the following table to determine how long to extend the exposure
period.
*If reading is 50 percent below minimum or less, then abort the
treatment. For example, if the minimum reading is 38 ounces then the
reading 50 percent below the minimum is 19 ounces
[38 ounces − (38 ounces × .50) = 19 ounces]. (See the following special
procedures for fruits and vegetables using T101 or equivalent.)
Special Procedures for Fruits, Vegetables, or Perishable
Commodities Using Schedule T101-a-1 or Equivalent
Use these instructions only for fruits and vegetables being fumigated under
treatment schedule T101-a-1 or equivalent.
Commodities used for food or feed may not be re-treated. If commodities fall
into this category, the only options are the following:
◆ Return to the country of origin
◆ Re-export to another country if they will accept the shipment
◆ Destroy by incineration
TABLE 2-8-4: Determine the Extended Exposure Period
If the exposure time is:
And the reading is
below minimum by:* Then extend exposure:
Less than 12 hours 10 oz. or less 10 percent of the time lapse since the
last acceptable reading
11 oz. or more 30 minutes
12 hours or more 10 oz. or less 10 percent of the time lapse since the
last acceptable reading
11 oz. or more 2 hours or 10 percent of time lapse since
last acceptable reading, whichever is
greater
Fresh fruits and vegetables are sensitive to MB so you should double check
volume calculations and dosage measurements to avoid accidental
overdoses. If any 30 minute readings are 50 percent or more above the
minimum concentration, it indicates a miscalculation of the dosage. Include a
brief report on the PPQ Form 429 stating possible reasons for the overdose.
Exposure periods are decreased for fumigations where concentration readings
are much higher than required. See table on the following pages to determine
when to reduce exposure periods.
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Special Procedures for Adding Gas and Extending Exposure Period
10/2002-04 Treatment Manual 2-8-19
PPQ
Use Table 2-2-6 and Table 2-2-7 on the following pages for fresh fruits
and vegetables to determine if you need to add gas or extend or
decrease the exposure time. Average your concentration readings
before using the tables. Select the proper table based on the time of
the T/C unit concentration reading (30 minutes or 2 hours).
Adding Gas
When adding gas, these procedures must be followed:
1. Heat water in volatilizer.
2. Turn on fans.
3. Take weight of the cylinder.
4. With your SCBA on, open valve on cylinder and introduce the
gas.
5. Close valve when the weight of the cylinder indicates that the
needed amount of gas has been added.
6. Record quantity of fumigant added in Block 34 and additional
fan time in Block 30 of the PPQ Form 429.
Note the time the fumigator started introducing additional gas and the
time the fumigator finished introducing gas and record in Block 40
(Remarks) of the PPQ Form 429. Run the fans until there is even gas
distribution throughout the stack. Turn off fans, then take a
concentration reading 30 minutes after the gas has been introduced. If
all readings are above minimum concentration levels, then proceed as
usual with the remaining scheduled concentration readings.
Important
These tables apply only to those T101 schedules lasting 2 hours or less at a
dosage rate of 4lbs/1000ft3 or less. They do not apply to schedules of longer
duration.
To avoid injuring the commodity, add fumigant using the following formula:
1.6 X number of oz. below minimum X vol/1,000 = oz. of gas to add
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
　
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