クエン酸鉄アンモニウム

外観

緑色、赤褐色、深赤色、褐色又は帯褐黄色で、透明なりん片状結晶、粉末、粒又は塊

溶解性

水に易溶。エタノールに不溶。水に極めて溶けやすく、エタノールにほとんど溶けない。

解説

クエン酸鉄アンモニウム，クエン酸の第二鉄塩。鉄分補給として貧血用薬などに含有。2価および3価の鉄塩の存在が知られているが，2価のものはきわめて不安定である。3価の塩Fe(NH4)2H(C6H5O7)2はクエン酸鉄(III)にアンモニアを作用させると生成する。

用途

医薬品原料、鉄及び補血強壮剤研究用。

用途

食品の鉄強化剤、医薬品原料、青写真材料。

効能

診断補助薬 (造影剤)

商品名

フェリセルツ (大塚製薬)

使用上の注意

空気中で湿気を吸収しやすく、光によって変質する。

説明

Ammonium ferric citrate is a food additive with E number E381 used as an acidity regulator. It is a green or reddish-brown powder which is very soluble in water.
The molecular formula of ammonium iron (III) citrate is variable. It can be prepared by adding Fe(OH)3 to an aqueous solution of citric acid and ammonia . The brown form is approximately 9% NH₃, 16.5 – 18.5 % Fe , and 65 % hydrated citric acid; the green form is approximately 7.5 % NH3 , 14.5 – 16 % Fe, and 75% hydrated citric acid. The green type is more readily reduced by light than the brown.
Other uses for ammonium ferric citrate include water purification and printing (cyano type). It is used as a reducing agent of metal salts of low activity like gold and silver and is also in a commonly used recipe with potassium ferricyanide to make cyanotype prints. Ammonium ferric citrate is also used in Kligler iron deeps to determine hydrogen sulfide production in microbial metabolism.
In medicine, ammonium ferric citrate is used as a contrast medium. It is also used as a hematinic.

化学的特性

brownish-yellow to brown powder

使用

Hematinic

一般的な説明

Ammonium ferric citrate is a yellowish brown to red solid with a faint odor of ammonia. Ammonium ferric citrate is soluble in water. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. Ammonium ferric citrate is used in medicine, in making blueprints, and as a feed additive.

空気と水の反応

Water soluble.

反応プロフィール

Acidic salts, such as Ammonium ferric citrate, are generally soluble in water. The resulting solutions contain moderate concentrations of hydrogen ions and have pH's of less than 7.0. They react as acids to neutralize bases. These neutralizations generate heat, but less or far less than is generated by neutralization of inorganic acids, inorganic oxoacids, and carboxylic acid. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible. Many of these compounds catalyze organic reactions. Special Hazards of Combustion Products: Toxic oxides of nitrogen or ammonia gas may be formed in fires [USCG, 1999].

健康ハザード

Inhalation of dust irritates nose and throat. Ingestion causes irritation of mouth and stomach. Dust irritates eyes and causes mild irritation of skin on prolonged contact.

火災危険

Special Hazards of Combustion Products: Toxic oxides of nitrogen or ammonia gas may be formed in fires.

職業ばく露

Ferric ammonium citrate is used in blueprinting, photography, medical treatment; and as an animal food additive.

輸送方法

UN3077 Environmentally hazardous substances, solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous material, Technical Name Required.

不和合性

Compounds of the carboxyl group react with all bases, both inorganic and organic (i.e., amines) releasing substantial heat, water and a salt that may be harmful. Incompatible with arsenic compounds (releases hydrogen cyanide gas), diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides (releasing heat, toxic and possibly flammable gases), thiosulfates and dithionites (releasing hydrogen sulfate and oxides of sulfur).