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Application of fumigant gas detection in the field of entry-exit inspection and quarantine

This site2017-04-07 14:01:56

灭绝! At present, the inspection of foreign species is very strict worldwide, especially harmful poisonous insects, etc. Accidental mass reproduction may cause catastrophic extinction of local species !
In the field of entry-exit inspection and quarantine, gas fumigation has become more important. The purpose of entry-exit fumigation: technology or method for killing harmful organisms in a certain time and in a confined space by means of compounds such as fumigants.
Common fumigants: methyl bromide, sulfuryl fluoride, phosphine, and ethylene oxide (plus carbon dioxide). Methyl bromide and sulfuryl fluoride are the most widely used in the entry and exit system. The above fumigant vapors have different scopes of application.

Methyl bromide:
Methyl bromide is a colorless, odorless, non-flammable fumigant. It is a good fumigant for plant quarantine. Methyl bromide is used as a fumigant. Aluminum should not be used.
Production equipment and equipment, because the liquid methyl bromide and aluminum will react and explode, the detector can determine the concentration of less than 2g / m3 (500pm).
Higher concentrations can be measured with a thermal conductivity analyzer or other gas analyzer. Methyl bromide may result in fumigation of agricultural products with high sulfur content.
Normal odor, methane bromide fumigation is generally not recommended: cream, lard, fat (not in air-tight cans); bone meal; charcoal;
Slag bricks or bricks made of concrete and slag; fur, felt, horsehair, feather pillows, linoleum padding, yak rugs; writing paper with high rag content and other sulfur content
Tall paper, magazines and 新橙彩票papers made from pulp and paper; iodized salt, salt bricks containing sulfur or their compounds; leather products, especially goat leather products; photographic drugs (excluding photographic film or X-ray film);
Rubber products, especially sponge rubber, foam rubber and recycled rubber, including pillows, body cushions, rubber stamps, silver shiny paper for decorating furniture; soy flour, wheat flour, other high protein flours, baking powder;
Woolen fabrics, especially Angora wool, soft yarn wool and sweaters, viscose and rayon.
Methyl bromide gas detection tube: 5ml / m3 ~ 50 ml / m3 and 10g / m3 ~ 100g / m3
Testing requirements: The concentration after 30 minutes of administration is greater than 78% of the administered dose; the concentration within 24 hours of administration is greater than 50% of the administered dose.

The previous concentration was greater than 30% of the administered dose.
Fumigation residue detection requirements: <2mg / m3, about 0.5ppm (refer to occupational health standard GBZ 2.1)
Requirements for testing instruments: testing accuracy is 1ml / m3

Sulfuryl fluoride:
Sulfuryl fluoride is a colorless and odorless compressed gas. Sulfuryl fluoride is highly toxic to all insect states except eggs, but to many eggs
Endurance even at high concentrations. Sulfuryl fluoride on metals, plastics, paper, leather, cloth, photographic equipment and many other materials
There is no corrosion reaction, the absorption by agricultural products is smaller than that of methyl bromide, and the absorption can be quickly released. No auxiliary heat source is required for volatilization of sulfuryl fluoride, but
Toxic to plants, not suitable for fumigation of living plants, fruits or vegetables. Sulfonyl fluoride had almost no effect on the germination of most seeds. Below 21 ℃,
The efficacy of sulfuryl fluoride is rapidly decreasing. . Sulfur fluoride fumigation can be performed on soil (except for loose sand), but soil
It should be sufficiently wet even beyond the enclosed perimeter. In order to ensure the complete distribution of the fumigant in the entire sealed range, good air circulation is required.
The fumigant concentration should be monitored throughout the fumigation period. Application of sulfuryl fluoride for fumigation and insecticide, sulfuryl fluoride cannot be used to treat food and food raw materials.


Sulfuryl fluoride gas concentration detection tube:
Testing requirements: The concentration after 30 minutes of administration is greater than 78% of the administered dose; the concentration within 24 hours of administration is greater than 50% of the administered dose, and the concentration before deflation is greater than 30% of the administered dose.
Fumigation residue detection requirements: <20mg / m3, about 4.8ppm

Phosphine:
Phosphine is a colorless gas that reacts with certain metals and can corrode copper, copper alloys, brass, gold, and silver. Phosphine can damage electronic and electrical equipment and house equipment.
And some carbon paper and undeveloped photo film. Phosphine is often used to control insects on animal and plant products and other storage. Phosphine's effectiveness in controlling pests varies with insects.
Variety varies, flat storage fumigation feed, grain, cotton seeds and similar products can be fumigated in bulk with phosphine. Fumigation can be used in warehouses, rural collection rooms, train compartments, and canopies
Cargo or similar fumigation. Bulk grains can also be fumigated in tents. Not suitable for fumigation of copper, copper alloys, brass, gold and silver
Writing paper and undeveloped photo film. Phosphine gas concentration detection tubes: 1ml / m3 ~ 50 ml / m3 and 100ml / m3 ~ 2000ml / m3 Detection requirements: The concentration for 24 hours after administration is greater than 50% of the dose

熏蒸残留检测要求:<0.3mg/m3,约合0.2ppm。 The concentration before dispersing the air is more than 30% of the dosage, and the detection requirements for fumigant residue: <0.3mg / m3, about 0.2ppm.
Standards corresponding to fumigant gas:
SN / T1123-2002 Methyl bromide and sulfuryl fluoride curtain fumigation treatment regulations
SN / T1124-2002 Container Fumigation Regulations
SN / T1143-2002 Plant quarantine Fumigation operation rules for simple fumigation store
SN / T1263-2003 Regulations for fumigation of sulfuryl fluoride on ships sailing internationally
SN / T1425-2004 Operation procedures for fumigation of apple moth in fragrant pear by carbon disulfide
SN / T1435-2004 Rules for fumigation and removal of rodents for inbound and outbound trains
SN / T1442-2004 aluminum phosphide fumigation operation rules
SN / T1456-2004 Aluminous phosphide fumigation operation rules
SN / T1484-2004 Fumigation operation rules for log trains entering China
SN / T1587-2005 Vacuum fumigation treatment of dry worms in forest trees
SN / T1592-2005 Formalin fumigation treatment rules for feed imported to Korea
SN / T1595-2005 Fumigation and Extermination Regulations for Entry and Exit Ships
SN / T2016-2007 TCK epidemic wheat ethylene oxide fumigation treatment method
GBZ 2.1-2007 Occupational exposure limits for workplace hazardous factors Chemically harmful factors


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