•
Lead : Affects the central
nervous system in humans. When heated it can emit highly toxic fumes. Young
children can suffer mental retardation and semi-permanent brain damage by
exposure to lead.
•
Magnesium : Inhalation of
magnesium dust and fumes can cause metal fume fever. Particles embedded in the
skin produce gaseous blebs and gas gangrene. Dangerous fire hazard in the form
of dust or flakes when exposed to flames. Poisoning takes the form of
progressive deterioration in the central nervous system.
•
Zinc : Pure zinc powder is
non-toxic to humans by inhalation but difficulty arises from oxidation
(burning), as it emits zinc fumes. It stimulates the sensation of vomiting.
•
Manganese : Toxicity caused by dust or fumes. The main symptoms of
exposure are languor, sleepiness, weakness, emotional disturbances, spastic
gait and paralysis.
•
Sodium : When heated in air, it
emits toxic fumes of sodium oxide. Can cause dangerous fire hazard when exposed
to heat and moisture.
•
Potassium : Dangerous fire hazard and explosion can occur.
•
Copper : Inhalation of copper
dust and fume causes irritation in the respiratory tract. Absorption of excess
copper results in "Wilson's disease" in which excess copper is
deposited in the brain, skin, liver, pancreas and the myocardium (middle
muscular layer in the heart).
•
Cadmium : Its absorption can damage the kidneys and can cause
anaemia. Cadmium causes increased blood pressure and also a disease called
"Itai-Itai", which makes bones brittle resulting in multiple
fractures.
•
Phosphorous in the form of PO4 : Dangerous fire hazard when exposed to heat or chemical
reaction. Poison by inhalation, ingestion, skin contact and subcutaneous
routes. Ingestion affects the central nervous system. Toxic quantities have an
acute effect on the liver and can cause severe eye damage.
•
Sulphur in the form of SO4 : It affects the upper respiratory tract and the bronchi. It
may cause edema of the lungs or glottis, and can produce respiratory paralysis.
Poison to humans by inhalation. An eye, skin and mucous membrane irritant and
corrosive.
•
Nitrate : Highly inflammable and on decomposition they emit highly
toxic fumes. The symptoms are dizziness, abdominal cramps, vomiting, bloody
diarrhea, weakness, convulsions and collapse.
• Nitrite : Large amounts taken by mouth may produce nausea, vomiting,
cyanosis, collapse and coma. Repeated small doses can cause a fall in blood
pressure, rapid pulse, headaches and visual disturbances. When heated, emit
highly toxic fumes of NOx.