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Atomic number: 34 Atomic mass: 78.96g Density: 4.79g Melting point: 217°C Boiling point: 688°C.

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Presentation on theme: "Atomic number: 34 Atomic mass: 78.96g Density: 4.79g Melting point: 217°C Boiling point: 688°C."— Presentation transcript:

1 Atomic number: 34 Atomic mass: 78.96g Density: 4.79g Melting point: 217°C Boiling point: 688°C

2 Name: Selenium’s name came from the Greek word “Selene” after the Greek Goddess of the moon. Discovered in 1817 by Jons Jacob Berzelius a swedish chemist. Info: Selenium is a nonmetal and is related to Sulfur and tellurium. It has a resistance to the flow of electricity the brighter the light the better it conducts electricity.

3 Because of its resistance to the flow of electricity Selenium has been useful for light meters for cameras and copiers, electric eyes, and photo cells. It can also make electricity from direct sunlight which is used for solar cells (solar panels).

4 Acute Human: severe irritation to eyes, skin (redness, itching, and pain) and respiratory tract

5 Acute Human: severe irritation to eyes, skin (redness, itching, and pain) and respiratory tract. Animals: Horses exposed to high amounts will lose hair in the mane and tail, dull coat, lose weight easily. Chronic People that work in metal industries, paint industries exc. are more exposed to it. can cause dizziness, fatigue, and irritation of the mucous membrane.. If the exposure is high there could be a collection of fluid in the lungs and bronchitis may occur.

6 The major sources of selenium in drinking water are released from petroleum and metal refineries erosion of natural deposits and releases from mines.

7 IDLH: 1 mg/m3 (as Se)(NIOSH, 1997) TLV TWA: 0.2 mg/m3 (NIOSH 1997) NIOSH REL: TWA 0.2 mg/m3 OSHA PEL: TWA 0.2 mg/m3

8 A concentration of micrograms/l have been reported in the U.S. It is found in most bodies of water such as our drinking water, ground water, surface water and rivers.

9 If to much Selenium is found in drinking water your water supplier must do one of the following to lower the amount: Activated Alumina, Coagulation/Filtration, Lime Softening, Reverse Osmosis

10 ACS citation style: bibme.org, usa.net/toxics/chemicals/selenium.shtml Non-internet source: Text book

11 True or False? We consume it daily. There is no way to reduce the amount of Selenium. Selenium has a resistance to electricity. Little exposure can cause fluid in the lungs and bronchitis. Selenium is only released from metal refineries.


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