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3.2 Common Equipment Used in Decontamination
3.2.1 Common Equipment
Device to measure formaldehyde concentration
FormaldemeterR 400 has been found to be suitable and can be obtained from:
PPM Technology (UK) - http://www.ppm-technology.com
Device to measure ammonia concentration
DragerR-Tubes and AccuroR pumps have been found to be suitable:
Dragerwerk AG (Germany) - http://www.draeger.com/index.html
Tubes with a measuring range of 0-100 ppm are recommended
Formalin vaporizer
o
FV-001 Formalin Vaporizer - 220-240 V, 50/60 Hz
o
FV-002 Formalin Vaporizer - 100-130 V, 50/60 Hz
Esco Micro Pte. Ltd. - http://www.escoglobal.com
Spore strips (optional) to verify decontamination efficacy
3.2.2 Appropriate PPE
A solid front-back closing, full body, long-sleeved disposable lab gown
Disposable shoe covers
Disposable surgical/PVC gloves for hand protection
Note:
Gloves should be pulled over the knitted wrists of the gown rather than being worn inside. Double gloving
should be considered. Gloves must be worn while handling formalin and ammonia solutions. Compared to latex
gloves, Nitrile gloves exhibit higher resistance to formaldehyde and are less likely to cause allergic skin reactions.
Hence Nitrile gloves are preferred over latex gloves.
Full-faced mask with a disposable dust and mist respirator. The face shield should be wiped clean with
a suitable tissue and water each time after using it.
3.2.3 Common Apparatus
Beaker
Measuring cylinder
Tape
Decontamination bag
Measuring tape
Biohazard waste bag
3.3 Preparation Steps
1.
It is recommended that a safety briefing be conducted for all personnel in the laboratory where the
unit has been placed before carrying out the procedure.
2.
Access to the laboratory should be restricted during the procedure, especially when you’re using
formalin vapor/ paraformaldehyde gas and chlorine dioxide gas. A warning sign should be pasted on
the door of the lab to warn all personnel. No personnel should enter the lab until the procedure is
complete and the decontamination agent’s concentration has been verified to be within safe limits.
3.
Prior to starting the procedure, contingency plans should be drawn for possible incidences of breach
in the unit seal, leading to leakage of decontamination agent into the room. You should properly
study the ventilation design of the room and should keep appropriate equipment on standby so the
agent can be vented in the event of a leakage. One way of doing this would be to connect a flexible
hose to a small exhaust fan which can vent the contaminated air into an adjacent fume hood. Special
care should also be taken in case the air in the laboratory is re-circulated to other parts of the
building. In such a case, a leakage could even necessitate evacuation of other parts of the building.
4.
All interior work zones and surfaces of the unit should be decontaminated with a suitable disinfectant
before performing gaseous decontamination.
Summary of Contents for FV-001
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