mothballs are small balls of chemical pesticides and deodorants, sometimes used when storing clothing and other items susceptible to damage from mildew or larval moths (especially cloth moths such as Tineola bisselliella ). The use of mothballs when clothes are kept out of season has led to everyday use of the term "mothballed" and "incorporated into mothballs", to refer to whatever is stored or a suspended operation.
Video Mothball
Composition
The older mothballs contain mainly of naphthalene, but due to the naphthalene combustible nature, many modern mothball formulations use 1,4-dichlorobenzene. The latter formulation may be somewhat less flammable, although both chemicals have the same NFPA 704 rating for flammability. The latter chemicals are also labeled as para-dichlorobenzene, p-dichlorobenzene, pDCB, or GDP, making it more difficult to identify unless all of these synonyms are known to potential buyers. Both formulations have a strong, sharp, sweet-smelling odor that is often associated with mothballs. Both naphthalene and 1,4-dichlorobenzene undergo sublimation, which means that they evaporate from the solid state directly to the gas; This gas is toxic to moths and moth larvae.
Naphthalene and 1,4-dichlorobenzene should not be used together because the mixture may cause damage to the preserved items.
Due to the health risks of 1,4-dichlorobenzene, and flammable naphthalene, other substances such as camphor are sometimes used.
Maps Mothball
Usage
In addition to repelling or killing insects such as moths and moths, camphor can be used as a repellent to prevent bats from building themselves in the attic. Mothballs can repel snakes or mice. Camphor has the potential to be a danger to pets, livestock or children who may be in touch with them. The latest problem with imported and unregulated mothballs from China is also of great concern as there is no way to know what chemicals are being used during the process. However, the mothball label instructs the proper use in a sealed container. The legacy old cube has also been used by drag racers to increase the octane rating of the fuel, by dissolving mothballs in some fuels and filtering leftovers with filter paper.
Efficiency
Some claim that camphor is not effective as a snake repellent or as a rat repellent. However, camphor, continues to be advertised as squirrel repellent and is an ingredient in some commercial repellent products. Some websites claim that they are not as effective as a barrier to prevent squirrels nesting in interior building.
In the episode of "Scuba Diver, Car Capers" (2004), it proved "sensible" that adding camphor to a car fuel tank would increase horsepower.
Health risks
The Department of Health and Human Services (DHHS) has determined that 1,4-dichlorobenzene "can be anticipated as a carcinogen." This has been demonstrated by animal studies, although full-scale human studies have not been conducted. The National Toxicology Program (NTP), the International Agency for Research on Cancer (IARC) and the State of California considers 1,4-dichlorobenzene as a carcinogen.
Exposure to naphthalene lime may cause acute haemolysis (anemia) in people with glucose-6-phosphate dehydrogenase deficiency. The IARC classifies naphthalene as a possible carcinogenic in humans and other animals (see also Group 2B). The IARC suggests that acute exposure causes cataracts in humans, rats, rabbits, and mice. Chronic exposure to naphthalene vapor is also reported to cause cataracts and retinal hemorrhage. Under the California Proposition 65, naphthalene is listed as "Unknown State causes cancer."
Research at the University of Colorado at Boulder reveals a possible mechanism for the carcinogenic effects of camphor and some types of air fresheners.
1,4-Dichlorobenzene is a neurotoxin. It has been abused as inhalant, causing various neurotoxic effects.
Mothballs containing naphthalene have been banned in the European Union since 2008.
Alternative
As discussed in more detail in Tineola bisselliella, alternatives to mothballs for controlling clothing moths include dry cleaning, freezing, thorough discharge, or washing in hot water. Camphor is also used as a repellent of moths, especially in China. Unlike naphthalene and dichlorobenzene, camphor has drug applications and is not regarded as a carcinogen, although toxic in large doses.
The pheromone trap is also an effective tool used when trying to protect valuable clothing.
See also
- Block of urinal deodorizer - some species contain chemicals similar to camphor
References
External links
- Mothballs (Naphthalene and Paradichlorobenzene) - National Pesticide Information Center
- The Effectiveness of Mothball - Argonne National Laboratory Asks A Scientist
Source of the article : Wikipedia
0 Comments