Bismuth Subcarbonate BP
Bismuth subcarbonate (BiO)2CO3, sometimes written Bi2O2(CO3) is a chemical compound of bismuth containing both oxide and carbonate anions. Bismuth is in the +3 oxidation state. Bismuth subcarbonate occurs naturally as the mineral bismutite. Its structure consists of Bi-O layers and CO3 layers and is related to kettnerite, CaBi (CO3) OF. It is light-sensitive.
In modern medicine, bismuth subcarbonate has been made into nanotube arrays that exhibit antibacterial properties.
|Characters||It occurs as a white or almost white powder|
Gives reactions of carbonates
Gives reactions of bismuth
|Solubility||Practically insoluble in water and in ethanol (96 per cent). It dissolves with effervescence in mineral acids.|
|Appearance of solution||Solution S is not more opalescent than reference suspension II and is colorless|
|Chlorides||Not more than 500 ppm|
|Nitrates||Not more than 0.4%|
|Alkali and magnesium earth metals||Not more than 1.0%|
|Arsenic||Not more than 5 ppm|
|Copper||Not more than 50 ppm|
|Lead||Not more than 20 ppm|
|Silver||Not more than 25 ppm|
|Loss on drying||Not more than 1.0%|
|Assay||80.0 % to 82.5 % of Bi (dried substance).|
Shelf life, Storage and Packing
It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.
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