Calverton, Va.-based CHEMetrics Inc. introduces its new Sulfate Vacu-vials® Test Kit (K-9203). It features the self-filling Vacu-vial™ ampoules, which the user snaps in the sample. The Sulfate Vacu-vials test method employs the barium sulfate method. Sulfate ion reacts with barium chloride in an acidic solution to form a suspension of barium sulfate crystals of uniform size. The turbidity is proportional to the sulfate concentration of the sample and can be read on any spectrophotometer that accepts a 13-mm cell.