EESA10H3 Lecture Notes - Lecture 3: Abdominal Pain, List Of Gasoline Additives, Constipation
Document Summary
Liquid natural capital: the earth is a water planet, water (cid:272)overs 71% of the earth"s surfa(cid:272)e, mostly salt water, no species can live without water, s(cid:272)ulpting the earth"s surfa(cid:272)e, moderating climate, removing and diluting wastes and pollutants. Quality of water: ph scale, hardness, colour, turbidity, taste, odor, microbes and chemical. Indicates the likely presence of disease-causing agents: filter disk is placed on a medium that supports coliform bacteria for 24hours then the number of bacterial colonies are counted. Contaminants in drinking water: microbes, radionuclides, alpha emitters, beta/photon emitters, combined radium 226/228. Low concentrations can cause skin cancer and melanosis: concentrations above 50 g per liter are harmful to human health, fluoride. Fluoride concentration > 1. 5 mg per liter can become potentially harmful. Small amounts can be added to water to promote dental health: exposure to high concentrations of fluoride can cause dental fluorosis and skeletal fluorosis. Fluorosis is widespread in india: drinking and eating substances with high fluoride concentrations.
