ビスアルセネン酸鉛(II) 化学特性,用途語,生産方法
解説
亜ヒ酸鉛，メタ亜ヒ酸鉛 Pb(AsO2)2 。白色粉末。水に少量溶けるが加水分解する。アルカリ水溶液に易溶。2%の水溶液は，人畜に無害であるため殺虫剤として用いられる。メタ亜ヒ酸鉛のみがよく知られているが，それ以外に，オルト亜ヒ酸鉛 Pb3(AsO3)2 ，ピロ亜ヒ酸鉛 Pb2As2O5 ，メタ四亜ヒ酸鉛 Pb3As4O9・3H2O などが固体として得られている。
用途
販売禁止農薬
用途
殺虫剤
説明
Lead arsenate appears as odourless white heavy powder and practically is insoluble in water. It is not combustible and emits irritating or toxic fumes (or gases) in a fire. Lead arsenate is currently used as a growth regulator on grape fruit crop. A large bulk of lead arsenate is also used annually to control cockroaches, silverfish, crickets, earthworms, and other soil-inhabiting insects on golf greens and lawns and on airport turf adjoining runways to reduce bird hazard related to earthworm. Lead arsenate is quite stable and readily accumulates in soils either as a result of use in specific soil treatments or foliar application. Lead arsenate insecticide was used in many countries, including Australia, Canada, New Zealand, and the United States. It was used for insect pests on apples and other fruit tree, garden crops and turf grasses, on rubber and coffee trees, and for mosquito abatement in cattle dips. All insecticidal uses of lead arsenate in the United States were officially banned on August 1, 1988 (U.S. EPA, 1988), with a comment that all registrations for insecticidal use had lapsed before that date. In Australia, use of lead arsenate decreased after the introduction of DDT in 1950, and it has not been used on exported crops since 1983.
化学的特性
Lead arsenate is an odorless, white, heavy powder. It is not combustible and emits irritating
or toxic fumes (or gases) in a fi re. Lead arsenate enters the body by inhalation, or from
contaminated food and beverages. It is used to make insecticides.
使用
Lead arsenate [Pb3(AsO4)4] is a toxic commercial insecticide and herbicide.
調製方法
Lead arsenate is produced mainly from lead acetate, lead nitrate, and lead oxide and disodium arsenate.The direct reaction of arsenic acid with litharge in the presence of nitric acid gives a dilead arsenate. Com mercial lead arsenates contain mostly PbHAsO4 along with varying amounts of Pb3(AsO4)2. Accordingly, their lead content is higher and their As2O3 content lower than the levels calculated for PbHAsO4.
健康ハザード
Exposures to lead arsenate occur in work areas and it is absorbed into the body by inhalation
of its dust and by ingestion. It is irritating to the eyes, the skin, and the respiratory
tract, and causes adverse effects on the gastrointestinal tract, nervous system, kidneys,
liver, and blood. Accidental ingestion of lead arsenate in the workplace causes cough,
sore throat, abdominal pain, diarrhea, drowsiness, headache, nausea, vomiting, muscular
cramp, constipation, excitation, and disorientation in the worker.
職業ばく露
Used as an insecticide, herbicide, and
in manufacture of drugs; veterinary tapeworm medicine.
Incompatibilities: Violent reactions occur from contact
with oxidizers, chemically active metals; strong acids.
Acids and acid mists cause the release of arsine, a deadly
gas. Decomposes above 270C forming toxic fumes including arsenic and lead compounds
輸送方法
UN1617 Lead arsenates, Hazard Class: 6.1;
Labels: 6.1-Poisonous materials
不和合性
Used as an insecticide, herbicide, and
in manufacture of drugs; veterinary tapeworm medicine.
Incompatibilities: Violent reactions occur from contact
with oxidizers, chemically active metals; strong acids.
Acids and acid mists cause the release of arsine, a deadly
gas. Decomposes above 270C forming toxic fumes including arsenic and lead compounds
廃棄物の処理
Long- term storage in large,
weatherproof, and sift-proof storage bins or silos; may be
disposed of by conversion to soluble salt, such as chloride,
precipitation as sulfide and return to supplier
ビスアルセネン酸鉛(II) 上流と下流の製品情報
原材料
準備製品