heavy metals

1) lead 2) mercury 3) cadmium 4) tin 5) iron

1) lead acid batteries 2) lead flashing used in construction

1) construction workers may inhale lead dust or absorb it through the skin causing acute issues such as brain damage and paralysis and eventually death 2) rainwater flowing over lead rood flashing may inhibit the growth of moss and lichens

1) water pipes= all lead water pipes have been replaced preventing chronic exposure, lead solder has also now been replaces 2) petrol additives= lead replaced with chemicals such as benzene 3) fishing weights = replaced with less toxic metals

1) disposal of items containing mercury such as batteries and thermometers 2) chemical plants that produce chlorine using mercury electrodes 3) combustion of coal

1) liquid mercury is not easily absorbed through the skin or gut although vapors may be absorbed in the lungs if inhaled 2) inorganic mercury such as mercury oxide is absorbed well in the gut 3) organic mercury is absorbed easily through the skin and the gut and inhalation. causes issues such as • kidney damage • brain damage

1) replace mercury thermometers with alcohol or electronic thermometers 2) removed from effluents by reverse osmosis or activated carbon filters 3) ion-exchange filters 4 )dispose at high PH to reduce the solubility

1) disposal of old nickel-cadmium batteries 2) incineration of wastes containing cadmium pigments such as paints 3) drainage water of cadmium and zinc mines

brain damage paralysis lung cancer kidney failure skeletal collapse

1) restrict of ban cadmium uses 2) disposed of in hazardous landfill