Silver compounds brines

Mercury compounds continue to have numerous commercial uses. Besides its use as a preservative, mercury is used in the manufacture of many technical and medical instruments including blood pressure measurement devices, manometers, thermometers, and barometers. Mercury is also used in production of certain types of fluorescent lamps and in the chloralkali industry, where chlorine and caustic soda are produced using brine electrolysis in mercury cells. Metallic mercury is used in the production of precious metals such as gold and silver. As part of the production process, metallic mercury can be used to concentrate gold from... 

Today, we produce bromine the same way Balard did. Our major source of the element is in Arkansas, where there are deep brine wells. Chlorine gas is added to the heated brine, and jets of air or steam drive the bromine out of solution. Bromine and its compounds have many applications. We use the element itself to disinfect water, just like chlorine. Silver bromide is sensitive to light, and it s fundamental to photography. At one time, potassium bromide was a common sedative. We still say Take a bromide when we mean Calm down. ... 

---