CHEMETRICS Chloride Test Kit, 10,000 to 100,000 ppm, 30 Tests, K-2070

TECHNICAL DATA SHEET Chloride - Mercuric Nitrate Method Version 9 / Aug. 2025 Applications and Industries Interference Information Drinking water, surface waters, seawater, domestic and • Bromide and iodide are titrated along with chloride causing industrial wastewater. a false positive result. • Chromate and sulfite may interfere when present in excess References of 10 ppm. ASTM D 512 – 04, Chloride Ion in Water, Test Method A • Sulfide is expected to interfere. APHA Standard Methods, 23rd ed., Method 4500 CI- C -1997 EPA Methods for Chemical Analysis of Water and Wastes, • Nitrite interferes significantly. This chemistry is not method 325.3 (1983). applicable for the analysis of nitrite-treated cooling waters. • Copper should not interfere at levels below 50 ppm. Chemistry • Ferrous and ferric iron do not affect the accuracy of the test In an acidic solution, mercuric nitrate reacts with chloride to if present at up to 125 ppm, unless hydrogen peroxide is form mercuric chloride. Diphenylcarbazone, the endpoint present. Iron may alter the solution and/or end point colors. indicator, forms a purple complex with excess mercuric ions. • Hydrogen peroxide, in the presence of iron, prevents the Results are expressed as ppm (mg/L) Cl-. formation of the purple color, causing a false high result. Available Analysis Systems Addition of 2% EDTA to the sample prior to analysis will Titrimetric: Titrets® help to minimize the interference. Hydrogen peroxide alone at up to 125 ppm does not interfere. Storage Requirements • Zinc, lead, nickel, and chromous ion may alter the solution Products should be stored in the dark and at room and/or endpoint color but should not affect the accuracy of temperature. the test if present at up to 100 ppm. Shelf Life • QACs interfere if present at ppm levels. When stored in the dark and at room temperature: • Deep sample color may interfere. Titrets® kit: at least 1 year • Samples with high pHs or that are buffered to a pH above approximately 3 may cause a white precipitate to form in Accuracy Statement the test ampoule and prevent the formation of the purple Statements of accuracy are based on laboratory tests color, causing a false positive test result. The pH of such performed under ideal testing conditions using standards of samples can be adjusted with 0.1N Nitric Acid (HNO3) prior known concentration prepared in deionized water. to analysis. Sample pHs of less than 3 may limit the ability Due to the non-linear nature of the test scale, the accuracy of of the indicator to form the purple color, also causing false these tests varies with the location of the test result on the high results. Sodium hydroxide (NaOH), but not sodium scale. At twice the minimum concentration for a particular kit carbonate (Na2CO3), can be used to adjust the sample pH range, the accuracy is ± 10% error. to near neutral prior to analysis. Safety Information Interpretation of Results Safety Data Sheets (SDS) are available upon request and at At the endpoint of this titration, the color of the solution in the www.sdsfetch.com. Read SDS before using these products. test ampoule changes from purple to colorless. If the Titret® Breaking the tip of an ampoule in air when a valve assembly is ampoule is filled with sample but the color of the solution not attached may cause the glass ampoule to shatter. Wear remains purple (does not change to colorless), the chloride safety glasses and protective gloves. concentration is below the test range. If the solution in the Note: These products contain mercury and must be disposed ampoule is colorless immediately upon introduction of the first of according to local, state and federal laws. small dose of sample, add additional small doses to ensure the purple color does not appear. If no purple appears, the chloride concentration is above the test range. 4295 Catlett Rd., Midland, VA 22728 │ 800.356.3072 │ tech@aquaphoenixsci.com