)
CHEMets Chromate Hexavalent Visual Method
Home » CHEMets Chromate Hexavalent Visual Method
CHEMets Chromate Hexavalent Visual Method
The CHEMets Method To perform a test, immerse the CHEMet ampoule into the sample and snap off the tip (Step 1)- the correct volume of sample is automatically drawn in, filling the ampoule; a small inert gas bubble remains in the ampoule. To facilitate mixing the sample and reagent, tilt the ampoule back and forth so the bubble travels from end to end (Step 2). In 2 minutes or less, quantify the result by comparing the filled ampoule to the appropriate color standard(s) (Step 3). For higher concentrations, the flat comparator is used. For lower concentrations, the round comparator is used. The ampoule is compared with the standards until a color match is found. Kits include 30 ampoules, comparator(s), accessory solution(s)(when necessary), a sample cup, and instructions. Refill packs of 30 ampoules and accessory solutions are available separately. Comparators have a 2-year shelflife. Material Safety Data Sheets are provided in test kits. CHEMets ampoules are designed for maximum simplicity and accuracy. Each glass ampoule is 7 mm in diameter, 100 mm in length, with a tapered, pre-scored tip; reagents are vacuum-sealed inside.
Product Description
Method
References: APHA Standard Methods, 20th ed., pp. 3-66, Method 3500-Cr B (1998). ASTM D 1687-92 (1996), Chromium in Water, Test method A.
Hexavalent chromium salts are used in numerous industrial processes. They are also used extensively as corrosion inhibitors in open and closed cooling water systems. With the chromate test method, hexavalent chromium reacts with diphenylcarbazide under acid conditions to form a red-violet color. Results are quantified photometrically or by visual comparison with standards that are calibrated in ppm (mg/L) CrO4.
Visual Kits
Range: 0-1 & 1-10 ppm
MDL: 0.05 ppm / Method: Diphenylcarbazide
Cat# CHEMets Kit K-2810
CHEMets Refill, 30 ampoules R-2810
Acidifier Solution Pack, six 10 mL bottles, Shelf-life 2 years A-28001
Low Range Comparator, Shelf-life 2 years: 0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0 ppm C-2801
High Range Comparator, Shelf-life 2 years: 1, 2, 3, 4, 5, 6, 7, 8, 10 ppm C-2810
Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Low and High Range Comparators, Acidifier Solution, 25 mL sample cup, instructions, and MSDS.