メチル水銀 化学特性,用途語,生産方法
解説
メチル水銀，気化しやすい液体のジメチル水銀Hg（CH3）2のほか，Hg（CH3）X（XはハロゲンやOHなど）の形の化合物がある。Hg（CH3）Xは固体だが，気化しやすいものが多い。水に難溶，脂肪などに易溶。猛毒で，中枢神経をおかす。症状としては，視野狭窄や運動失調など。水銀とメチル基を含む有機化合物との反応でしばしば生じ，環境中では魚介類などに蓄積されやすく，水俣病の原因となった。
説明
Much of the notoriety of methylmercury has been generated
from three separate mass poisoning events, two in Japan and
one in Iraq. These events, at Minamata Bay in Niigata prefecture,
and in Basra, demonstrated the potential lethality of
methylmercury after it was a known toxic substance, and,
though mercury is still an important risk factor for developmental
toxicity, since the 1970s there have not been any
large-scale poisonings of this type. Methylmercury is formed
naturally in aquatic environments through the action of
anaerobic bacteria on inorganic mercury.
化学的特性
Water soluble, lipid soluble, high vaporpressure.
使用
Organomercury compounds such as aryl and alkoxy-aryl have
been used in medicine, agriculture, and laboratory research.
Their use in medicine and in fungicides has been greatly
reduced or eliminated.
定義
Either of two com-pounds that contain the methyl group and commonsalts of monomethylmercury.
危険性
Mutagen; possible carcinogen; teratogen;central nervous system poisons that easily passthrough the blood–brain barrier.
安全性プロファイル
A poison. An
experimental teratogen. Experimental
reproductive effects. Mutation data
reported. Used as a fungicide. When heated
to decomposition it emits toxic fumes of
Hg.
職業ばく露
Methyl mercury has been
used as seed disinfectants and for fungicides. It has
also been used in organic synthesis.
環境運命予測
Inorganicmercury introduced as a pollutant into natural waters is
scavenged by particulate matter and deposited into bottom
sediments. Free Hg2+ is gradually released from this pool of
slightly soluble inorganic mercury and is then transformed by
microbial activity into methylmercury. Methylmercury diffuses
into thewater column and is takenupbyfishand other organisms
(either directly through water or through the food chain), and
accumulated in their tissue. The degree to which mercury is
transformed into methylmercury and transferred up the food
chain through bioaccumulation depends on a variety of factors,
including water chemistry and the complexity of the food web.
輸送方法
UN2025 Mercury compounds, solid, n.o.s.,
Hazard Class: 6.1; Labels: 6.2-Poisonous materials,
Technical Name Required.
不和合性
Incompatible with oxidizers (chlorates,
nitrates, peroxides, permanganates, perchlorates, chlorine,
bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases,
strong acids, oxoacids, epoxides. May be sensitive to light.
メチル水銀 上流と下流の製品情報
原材料
準備製品