February 2020

Inside the Issue


Welding and Manganese (Metal) Poisoning

Welding fumes are composed of metals and most fumes contain a small percentage of manganese (Mn). There is a concern by workers, employers, and health professionals about potential neurological effects associated with exposure to manganese in welding fumes. Manganese is an essential nutrient. Manganese is a hard, gray metal that is frequently used in the production of steel. Workers may be harmed from exposure to manganese through the breathing of manganese fumes or dusts.

A healthy person with normal liver and kidney function can excrete excess dietary manganese. Inhaled manganese is of greater concern because it bypasses the body’s normal defense mechanisms. This can lead to manganese accumulation and adverse health effects including damage to the lungs, liver, kidney and central nervous system. Male workers exposed to manganese also have a higher risk of fertility problems. Prolonged exposure to high manganese concentrations (>1 mg/m3) in air may lead to a Parkinsonian syndrome known as “manganism.”

Chronic exposure to the manganese-containing pesticide, maneb, is also reported to cause Parkinson-like symptoms.
Parkinson-like symptoms may include tremors, slowness of movement, muscle rigidity, and poor balance.

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