=Chromic Acid, Chromate, Bichromate of Potassium.=--These act as
corrosives when solid or in concentrated liquid forms. In dilute
solutions they act as irritants. Used as dyes; have proved fatal more
than once. Those engaged in their manufacture suffer from unhealthy
ulcers on the nasal septum and hands. The former may to some extent be
prevented by taking snuff. Lead chromate (chrome yellow) is a powerful
irritant poison. Two drachms of the bichromate caused death in four
hours.
_Tests._--Yellow precipitate with salts of lead, deep red with those of
silver.
_Treatment._--Emetics, magnesia, and diluents. Washing out of the
stomach with weak solution of nitrate of silver.
XXVII.--GASEOUS POISONS
=Carbon Dioxide.=--Carbon dioxide is a product of combustion and
respiration, and is generated in many ways during fermentation. It is a
constituent of _choke damp_ due to explosions in coal-mines, and is
given off from lime-kilns, brick-kilns, and cement-works. It is often
met with in dangerous quantities in wells and in brewers' vats. From 10
to 15 per cent. in the atmosphere would prove fatal, but even 2 per
cent. inhaled for long would produce serious symptoms.
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