Determination of Chloride in Water

Normal adult human body contains _______of chloride.
Why can’t we perform the test at higher pH level?
Method used to determine chloride is water is
Water contaminated with Sodium Chloride creates a higher water density and will settle at the deepest part of the water body where current velocities are low such as in ponds and lakes.
Concentration of chloride in water suitable for drinking should be less than