Like other common water additives such as chlorine, hydrofluosilicic acid and sodium silicofluoride decrease pH and cause a small increase of corrosivity, but this problem is easily addressed by increasing the pH . Trace levels of arsenic and lead may be present in fluoride compounds added to water; however, concentrations are below measurement limits.
2.
Like other common water additives such as chlorine, hydrofluosilicic acid and sodium silicofluoride decrease pH and cause a small increase of corrosivity, but this problem is easily addressed by increasing the pH . Trace levels of arsenic and lead may be present in fluoride compounds added to water, but no credible evidence exists that their presence is of concern : concentrations are below measurement limits.
परिभाषा
an unstable poisonous corrosive acid known primarily in the form of its salts पर्याय: fluosilicic acid,
मोबाइल