Ba=136.9.

Barii Dioxidum

Barium Dioxide. BaO2=168.82. Synonym.- Barium Peroxide.

Source

By conducting oxygen over Barium Oxide, heated to full redness.

Characters

A heavy, grayish-white, or pale, yellowish-white, amorphous, coarse powder, odorless and tasteless. When exposed to the air it slowly attracts moisture and Carbon Dioxide, and is gradually decomposed. Solubility. - Almost insoluble in water.

Impurities

Sulphates and nitrates.

Incompatibles

Hydrochloric, phosphoric and most other mineral acids.

Barium Dioxide is used in preparing Aqua Hydrogenii Dioxidi.

Action of Barium Salts

Barium chloride (not official) causes the cardiac contractions to become slower and more forcible, acting like digitalis. The blood-vessels are constricted, and the blood pressure rises. The plain muscular fibres of the intestine may be excited, and the peristalsis is increased. In these respects it resembles ergot as well as digitalis. It acts like veratrine when applied locally to voluntary muscles, prolonging the contraction; but this effect is done away with by the application of potassium salts.

Therapeutics of Barium Salts

These are not often given, but the chloride (dose, 1/10 to 1/2 gr., .006 to .03 gm.) has been used for mitral insufficiency accompanied by irregularity of the heart, for haemorrhage, and as a stimulant in atony of the bladder or intestine. Formerly it was given in nervous diseases. The waters of Llangammarch wells contain 6.7 gr. .40 gm. to the Imperial gallon 4545 c.c. of barium chloride, and have been used in cardiac cases. The sulphide (not official) has been used as a depilatory.

Toxicology

Symptoms

Poisonous doses cause salivation, thirst, vomiting, purging, difficulty of breathing, a slow pulse, and, from its action on the spinal cord, paralysis of the limbs. The heart is arrested in systole.

II

Treatment

Poisoning should be treated by non-irritant emetics and draughts of weak solution of sodium or magnesium sulphate, followed by albuminous drinks, and diffusible stimulants.