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Turbidimetric Photometric Method (0-50ppm) Principle / Concept This method is based on the precipitation of sulfate ion in a hydrochloric acid medium with barium chloride in such a manner as to form barium sulfate crystals of uniform size. The glycerol sulfate solution is used to maintain proper crystal size, and control of the stirring and waiting times is necessary to obtain reproducible result. The resultant turbidity is measured at a wavelength sensitive to turbidity on a photometer. The blank serves to partially cancel out interferences due to color and suspended matter. Apparatus Required ::: Filter photometer complete with assorted laboratory glassware. ::: RXSOL-62-6198-001 doesn’t include this apparatus Chemicals Required Glycerol Sulfate Solution ::: Part No. RXSOL-62-6198-002 http://rxmarine.com/Glycerol-Sulfate-Solution Barium Chloride (Natural ) Solution ::: Part No. RXSOL-60-6263-250 rxmarine.com/Barium-Chloride-Solution Sulfate Standard ::: Part No. RXSOL-62-6198-003 http://rxmarine.com/Sulfate-Standard-Solution