Group VIII-B: TRIADS (PART 1-2)

Triads

Conceptualized by Johann Wolfgang Dobereiner

1st Triad: Fe, Co Ni,

2nd Triad: Ru, Rh, Pd

3rd Triad: Os, Ir, Pt

Iron

aka: Ferum

Present in Proteins:

• Hemoglobin

• Transferrin (transfer)

• Ferritin (storage)

• Cytochrome oxidase enzyme

Enhance absorption of Iron:

• Vitamins

• Copper

• Most element in engineering

• Iron is best absorbed in the duodenum.

• The best known hypothesis of iron absorption:

Mucosal black postulation

Cast iron aka: pig iron

crude metal iron from

blast furnace (92-94%).

Cementite or white cast

solid solution of hard, brittle iron carbide

Gray cast aka Graffite scales

liquid iron is run into sand molds and allowed to cool.

Wrought iron

product obtained by removing most of the impurities from cast iron

Iron Pyrite aka Fool’s gold

Is a native iron sulfide.

Reduced iron

made from ferric oxide with the addition of hydrogen

Steel

Made up of Iron and Carbon.

Misch metal

Is 70% Cerium and 30% Iron

FERRIC SUBSULFATE SOLUTION

Aka: monsel’s solution

Cobalt

Name from German word “der kobold“ meaning “a goblin or gnome”

• Essential in development of erythrocytes and hemoglobin.

• Component of Vitamin B12 (Cyanocobalamin

Vogel’s reaction

When a concentrated solution

of ammonium thiocyanate is added to a

cobaltous solution, ammonium cobaltous

thiocyanate (beautiful blue) is formed

Nickel

aka: Old Nick’s Copper

• Fossil fuel

• Component of fancy jewelry

• Nickel hydroxide in solution is COLOR GREEN

Raney nickel

Aluminum + Nickel

Monel nickel and Constantan

Nickel + Copper

German silver

Osmium

Densest metal - BEQ

Platinum

• Low oxidation metal and low reactivity nobel metal

•!Catalyst in finely divided steel

Pladium

Catalyst in finely divided steel.