Sulfate Indicator Solution principally based on the precipitation of sulfate ion in such a manner as to form sulfate crystals of uniform size.  The resultant turbidity is measured at a wavelength sensitive to turbidity on a photometer.  Other valuable Apparatus Required for Sulfate Test :::  Filter photometer complete with assorted laboratory glassware.  Chemicals Required Glycerol Sulfate Solution  ( The glycerol sulfate solution is used to maintain proper crystal size of pricipitated SULFATE partice ) Sulfate Indicator Solution  ::: RXSOL-60-6198-500 Sulfate Standard