Rhodium: The Elusive and Luxurious Metallic Treasure of Our Planet

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The Discovery of Rhodium

More than 200 years ago, British chemist William Hyde Wollaston discovered the chemical element rhodium. He found it as a by-product of platinum mining in South Africa. At first, he called it “platinum white,” but later named it rhodium.

Properties and Characteristics of Rhodium

Rhodium is a hard, silvery-white metal with a high melting point (3,565 degrees F or 1,963 degrees C). It has similar characteristics to other precious metals like gold and silver. Rhodium is highly resistant to corrosion and conducts electrical current easily.

Uses of Rhodium

Most of the available rhodium (80%) is used in catalytic converters in cars to clean exhaust emissions by breaking down nitrous oxide molecules, also known as NOx emissions. This helps reduce air pollution and prevent damage to human health and the environment. Rhodium is also used in other applications such as:

• Making nitric acid, acetic acid, or hydrogen reactions

• As a catalyst for making menthol (the minty flavor in chewing gum)

• As a coating for optic fibers and optical mirrors

• In electrical materials

Jewelry and Rhodium

Rhodium is often used to plate jewelry because it’s hypoallergenic (contains no nickel) and gives the metal a bright, silvery-white color. However, rhodium plating is thin and wears off quickly due to its hardness. Jewelry makers prefer to use rhodium on pieces that experience less rubbing and wear, like earrings or necklaces.

Safety Precautions

While rhodium itself is not toxic, inhaling the fumes released during the plating process can be hazardous to human health. Jewelers take safety precautions when working with rhodium, such as wearing protective gear and following proper ventilation procedures.

Conclusion

Thanks to Wollaston’s discovery of rhodium more than 200 years ago, we can now use this precious metal in various applications, from cleaning exhaust emissions to making jewelry. Despite its challenges, rhodium remains a valuable resource due to its unique properties and characteristics.

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