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assembly where the visible flame reacts in color to the halogen
fumigants. The air mixture to be tested is fed to the burner head
assembly by an attached search hose.
The halide detector is relatively trouble free. The burner head orifice is
extremely small and must be kept free of clogging with dust or other
debris. The reaction plate or cone needs to be replaced when it
becomes heavily corroded or burned.
Equipment
Halide Detector
8-1-10 Treatment Manual 06/2004-01
PPQ
Usage
The halide leak detector is made operable by holding a lighted match
in the window opening of the burner tube and turning the valve slowly
to the left. After the reaction plate or cone has heated to a red hot
color, the flame should be adjusted to the minimum size to maintain
that color. The detector is now ready for use. This is accomplished by
holding the open end of the search hose in, on, or near the area or
article to be tested. As the air sample thus drawn into the burner
passes over the heated reaction plate or cone, the flame color changes
if MB or any other halogen is present.
Since the operating halide leak detector contains an open flame, there
must be strict adherence to obvious safety principles. Even when not
in operation, it is advisable not to store the detector in a frequently
inhabited room, the fuel being a flammable gas under compression.
The following are the approximate MB concentrations associated with
the color intensity of the flame:***
*Threshold limit value for MB for exposure for 8 hours is 5 ppm.
**oz/1,000 ft3 = mg/liter = g/m3.
***Propane gas burns with a light blue flame when MB (methyl bromide) is not present.
TABLE 8-1-1: Approximate MB Concentration Associated with Flame Color
PPM* Oz/1,000 ft3** Flame color
0 0.0 No color change***
25 0.1 Faint fringe of green
50 0.2 Moderate green
125 0.5 Green
250 1.0 Strong green
500 2.0 Strong green-blue fringe
800 3.2 Strong blue-green
1,000 4.0 Blue
Equipment
Halide Detector
06/2004-01 Treatment Manual 8-1-11
PPQ
This table of flame colors for various ppm’s of MB holds good only
when the detector is operated at its most sensitive rate; i.e., when the
flame is reduced to the lowest rate sufficient to keep the reactor plate
or cone red hot. Also, particularly when using the detector at night,
the flame has a bluish cast which must be taken into consideration.
FIGURE 8-1-2: Halide Gas Leak Detector Using Disposable Propane Tank
Equipment
Respiratory Protection
8-1-12 Treatment Manual 06/2004-01
PPQ
Respiratory Protection
Introduction
Fumigation or other treatments conducted under the monitored
conditions stated in this Manual and other program manuals, are safe
operations. The Occupational Safety and Health Administration
(OSHA) has ruled that employees with possible exposure to pesticides
(including fumigants) shall be provided adequate respiratory
protection from such exposure. This section discusses the types,
capabilities, limitations, and uses of different respiratory protection
available.
Responsibility
Management’s Responsibilities
1. Provide respiratory protective equipment when such equipment
is necessary to protect the health of the individual.
2. Provide equipment which is applicable and suitable for the
purpose intended.
3. Establish a maintenance program for respiratory devices used.
4. Initiate and maintain a regular training program to inform
personnel of basic and current information.
Officer’s Responsibilities
1. Use and maintain respiratory equipment in accordance with
instructions written in this manual and other instructions
issued. Adherence or nonadherence to prescribed instructions
for the proper use of protective devices and equipment will be a
factor in evaluating the quality of an employee’s performance.
Gross disregard for safety measures may result in disciplinary
action. A proper respiratory protection unit is required at the
treatment site.
2. Report any damage or malfunction of the device to management.
3. Carry out routine cleaning and care in accordance with
instructions in this manual or instructions provided by the
manufacturer.
TABLE 8-1-2: Threshold Limit Values of Fumigants
Toxicity Threshold limit value
Methyl bromide (MB) 5 ppm (skin)* STEL** and ceiling
Sulfuryl fluoride (SF) 10 ppm STEL**; 5 ppm TWA***
Phosphine (PH) 1 ppm STEL**; 0.3 ppm TWA***
Equipment
General
06/2004-01 Treatment Manual 8-1-13
PPQ
*Skin means the potential overall exposure includes absorption through the skin and mucous
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