Turbidity (TS and MOs), Temperature, pH, Sulfate and Sulfite and etc.

Thanks for your answer i would to know more info about tubidity and the process we use to release it

Dear Tony, You can use a whatman filter paper to get rid of silt and other visible impurities. If that does not help then use a .22 micron filter paper for filtration using a syringe filter. I hope you are using Fluoride ion selective electrode for your analysis because that is faster and more accurate than even ion chromatograph, though IC is good enough if you are doing a comprehensive ion analysis of anions. Phosphate ion is know to have an interference in fluoirde ion detection.

thanks Ganesh for reply

Turbidity is caused by Colloidal particles, which will remain always in suspension in water and will not settle easily. Colloidal particles are negatively charged and hence you need a positive charge to neutralize. Alum (Aluminium Sulfate) addition to turbid water with turbulent mixing will result in charge neutralization and micro floc formation. These micro flocs under gentle mixing will result in the formation of macro flocs and will settle down. The overlying water water can be separated and filtered through a sand filter to remove the left out micro flocs. This is the normal process adopted to remove turbidity.

Turbidity should not be used as a parameter to measure fluoride. Ion selective electrode is the accurate method to measure fluoride.

NEERI in India has developed a technique called "Nangonda Technique" to remove flouride present in water.

For the estimation of fluoride in water, Selective ion electrode method is one of the easiest ,presise and cast effective method. Standard must be prepared fresh for the calibration.

here is a link to general flouride concentrations, where they come from and methods to remove it https://water.tallyfox.com/answer/fluoride-removal-water

Fluoride may come in  drinking water from natural or anthropogenic sources. Various rock, soil and other material contain fluoride and when water in contact. Fluoride dissociated and dissolution take place. Thus reached to drinking water.