Inscrit le: 22 Juin 2004
Pays, Ville: Japon, Kanagawa-ken
|arsenic découvert dans du riz
|Note du Post : 5 Nombre d'avis : 2
|Un premier article du mainichi shimbun :
|MITO -- The Ibaraki Prefectural Government says eating rice in which an arsenic compound was found would have little effect on health because the concentration is extremely low.
Prefectural government officials said an organoarsenic compound was detected in rice harvested in an area of Kamisu, Ibaraki Prefecture. The area is believed to have been contaminated by toxic gas produced by the now defunct Imperial Japanese Army during World War II.
Prefectural officials said that eating the rice would have "little effect on health," but have asked four farmers to voluntarily withhold 13.7 tons on rice produced this year until it is confirmed to be safe.
Between May and August this year, the prefectural government tested 45 farming wells within a 500-meter radius of two other wells in which high levels of organoarsenic compounds were found, and detected a toxic substance in five locations.
When the National Institute for Environmental Studies carried out further tests on rice that was produced with water from the wells, the substance was reportedly detected in the rice.
Officials said the concentration of the substance was between 0.043 and 0.110 milligrams per kilogram of rice. (Mainichi Shimbun, Japan, Sept. 17, 2004)
Mais ca ne me suffit pas, aucune indication du produit réel, donc un autre article sur asia news: http://asia.news.yahoo.com/040916/kyodo/d854n5eo0.html
|Authorities probing the health hazards posed by poison gas agents left in Kamisu, Ibaraki Prefecture, by the Imperial Japanese Army have detected organic arsenic compounds in rice harvested at four farms in the town, the prefectural government said Thursday.
The prefectural government said it has asked the four farms not to ship some 13.7 tons of rice they harvested this fall to market but added the Environment Ministry's toxicity tests show the rice should not be harmful to human health even if consumed.
The compound, diphenylarsine, is contained in a chemical weapon knows as "sneezing gas" that is believed to have been abandoned by the military during World War II.
The authorities detected 0.043-0.11 milligram of the compound per 1 kilogram of rice harvested this autumn at the four farms.
A connection between the abandoned poison gas and residents' health problems surfaced in spring last year when dangerous levels of arsenic were found in the town's well water. A total of 39 wells for drinking water were found to be contaminated after the prefectural government conducted tests.
The contaminated water apparently caused mental and physical retardation in an infant boy. Arsenic compounds were also found in the urine of other residents.
The prefectural government also detected arsenic compounds in five of 45 wells used for farming and recently asked the National Institute for Environment Studies in the prefecture to check on rice harvested from fields where water from the wells in question is believed to have been used.
The government also detected arsenic compounds in rice harvested at one of the four farms last year during the recent tests.
The government checked five people who had eaten the rice. But it could not detect the substance in hair samples and did not find any health hazard.
Earlier, the government conducted tests on some of the rice harvested in the town when the health hazard surfaced last year, but it said the amount of arsenic detected in the rice was the same as that in nature.
However, the government found that the contamination of well water in the area was more serious than it had originally thought. It asked the local residents to refrain from using well water as drinking water.
The ministry found in a survey last year that poisonous gas was abandoned or buried by the military in 41 prefectures.
Donc un peu plus de précisioin, ici on nous dit : diphenylarsine avec des valeur jusqu'à 0.11 mg/kg riz
Recherche sur les toxiques. Il existe deux composés qui sont le diphenylchloroarsine (CLARK I) et diphenylcyanoarsine (CLARK II), ils ont été utilisé comme gaz de combats par les allemands (gaz qui fait vomir) puis par les japonais. Mais ici ce qui m'intéresse c'est sa toxicité par ingestion. Aucune données pour l'ingestion, seulement des valeurs pour l'inhalation.
CLARK I : valeurs et autres, http://ull.chemistry.uakron.edu/erd/chemicals1/1/738.html
CLARK II : valeurs et autres, http://ull.chemistry.uakron.edu/erd/chemicals1/1/727.html
Mes conclusions sont, il est bien noté 'The toxological properties of this substance have not been fully investigated', donc on ne sait pas quel sont les doses par ingestion qui produiront un effet. Il faut aussi remarquer que ces produits ont un charactère carcinogène. Quand des scientifiques prétendent qu'il n'y a aucun risque, ben je doute, il y a assez d'exemples dans l'histoire ou on a découvert les effets des produits bien après leur découverte.
Mon conseil, je ne mangerai pas de ce riz, et si je vais dans la région, je ne boirai surtout pas de l'eau de cette région.
(PS : à noter la différence entre les deux journaux, mainichi : on est en sécurité. Asia news dénote au moins un cas d'intoxication par les eaux polluées)
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