Barcelona (Freddie Mercury and Montserrat Caballé song) Barcelona (Freddie Mercury and Montserrat Caballé song) "Barcelona" is a single released by Queen vocalist Freddie Mercury and operatic soprano Montserrat Caballé. A part of their collaborative album "Barcelona", it also appeared on Queen's "Greatest Hits III". The song reflects Mercury's love of opera with his high notes and Caballé's operatic vocals, backed by a full orchestra. Originally released in 1987, it was one of the biggest hits of Mercury's solo career, reaching number eight in the UK Singles Chart. After Mercury's death in 1991, it was featured at the 1992 Summer Olympics, after which the track climbed even higher,
Mercury in fish plant emissions. Chlorine chemical plants use mercury to extract chlorine from salt, which in many parts of the world is discharged as mercury compounds in waste water, though this process has been largely replaced by the more economically viable membrane cell process, which does not use mercury. Coal contains mercury as a natural contaminant. When it is fired for electricity generation, the mercury is released as smoke into the atmosphere. Most of this mercury pollution can be eliminated if pollution-control devices are installed. Mercury in the United States frequently comes from power plants, which release about 50% of the nation's