Definition of Physical Barriers. Physical barrier is the environmental and natural condition that act as a barrier in communication in sending message from sender to receiver. Organizational environment or interior workspace design problems, technological problems and noise are the parts of physical barriers.
Nitrate: Health Effects in Drinking Water. Nitrate is one of the most common groundwater contaminants in rural areas. It is regulated in drinking water primarily because excess levels can cause methemoglobinemia, or blue baby disease.
Nitrates are not generally harmful unless they are consumed in massive quantities. Nitrites, on their own and in moderation, are also not generally harmful. However, nitrites can be degraded into carcinogenic compounds by high heat and also by digestive enzymes.