Manganese risks in powder form

5 October 2001

Manganese risks in powder form

GROWERS adding powdered manganese sulphate to spray tanks as a micronutrient source are being advised to consider liquid formulation as a safer option.

The advice, from micronutrient specialist New-Trition, comes after the Health & Safety Executive issued a chemical hazard alert notice.

Repeated exposure to inorganic manganese compounds can damage the nervous system and lungs, it notes. Breathing dusts is one way they can get into the body.

The HSE move follows a COSH&#42 review of the Occupational Exposure Standards, which could lead to maximum exposure limits. In the meantime employers and employees are being encouraged to reduce exposure, by using a respirator when handling powders for example.

Another approach is to switch from powdered manganese, which risks inhalation, to a liquid form, says New-Tritions Frank Worsencroft. "With manganese effectively a commodity there is very little difference in cost. We have always offered a 15% liquid. A typical application, 2-3litres/ha, costs no more than £2/ha." &#42

Changing to a liquid could help reduce inhalation, agrees an HSE spokesman. "But users must then beware of splashes."