How is fluorine separated from other materials found with it?

The following processes are used for fluorine removal:

1.      filtration through activated alumina- this is the most widely used process

2.      coagulation-flocculation – or aluminum sulphate treatment - can only be used on raw water that requires sedimentation and that has low fluoride content.

3.      lime used to soften water -This method can be used but with a pH >10 and provided that the water has a sufficient magnesium level (high) because it is the magnesium oxide that will adsorb the fluorine. Approximately 50 mg · L–1 of magnesium is required to remove 1 mg · L–1 of fluorine.

4.      using tricalcium phosphate

5.      other processes

·         reverse osmosis

·         Electrodialysis 

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

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