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Chloride Test Kits

What is Chloride?
Chloride is the most common inorganic anion in water and wastewater, and often found as a component of salts. Common salts are calcium chloride (CaCl2), potassium chloride (KCl), and sodium chloride (NaCl). Natural sources of salt include the ocean and various salt deposits. Chloride can also enter water through more industrial sources like agriculture runoff, road salting, wastewater effluent, and industrial wastewater. The Maximum Secondary Contaminant Level in drinking water for chloride is 250 mg/L.

Why Test for Chloride?
Chloride is corrosive to most metals in systems with elevated pressures and temperatures such as boilers and oil-drilling equipment. In drinking water, the presence of chloride can affect the taste of water. In some areas, saltwater intrusion contaminates freshwater aquifers. Elevated levels of chloride in the environment raise concerns about negative ecological impacts to aquatic and terrestrial life.

About Our Test Kits
The visual test kits utilize CHEMetrics Titrets® ampoules. Titrets ampoules use a reverse titration technique to measure analyte concentration levels (titrant volume inside the ampoule is fixed while the sample volume is varied). After snapping the ampoule tip, sample is drawn into the test ampoule in small doses until a color change signals the endpoint has been reached. The titration is stopped at the end point, and the liquid level in the ampoule corresponds to the concentration printed on a scale on the ampoule’s outer surface. Titrets can measure four different ranges (see below), and all use the mercuric nitrate chemistry for analysis.

The instrumental test kit utilizes CHEMetrics Vacu-vials® ampoules and ferric thiocyanate chemistry to test for chloride.  This test kit requires a CHEMetrics direct-readout photometers or a spectrophotometer capable of accepting a 13-mm diameter round cell.


Click on a catalog number in the tables below for more information or to purchase a test kit.

Visual Kits

Range MDL Method Kit Catalog No. Refill Catalog No.
20-200 ppm 20 ppm Mercuric Nitrate K-2020*
50-500 ppm 50 ppm Mercuric Nitrate K-2050*
250-2500 ppm 250 ppm Mercuric Nitrate K-2051*
1000-10,000 ppm 1000 ppm Mercuric Nitrate K-2055*
10,000-100,000 ppm 10,000 ppm Mercuric Nitrate K-2070*

Instrumental Kits

Range Method Kit Catalog No.
0-40.0 ppm Ferric Thiocyanate K-2103*


The Mercuric Nitrate Method

References: APHA Standard Methods, 23rd ed., Method 4500-Cl- C-1997. ASTM D 512-04, Chloride Ion in Water, Test Method A. USEPA Methods for Chemical Analysis of Water and Wastes, Method 325.3 (1983).
CHEMetrics employs a mercuric nitrate titrant in acid solution with diphenylcarbazone as the end point indicator in our Chloride in water test kits. Results are expressed as ppm (mg/L) Cl-.
The Ferric Thiocyanate Method

Reference: APHA Standard Methods, 23rd ed., 4500-Cl-E-1997. D. Zall, D. Fisher, M. Garner, “Photometric Determination of Chlorides in Water,” Analytical Chemistry, Vol 28, No. 11, pp. 1665-1668, November 1956. J. O’Brien, “Automatic Analysis of Chlorides in Sewage,“Wastes Engineering, pp. 670-672, December 1962.
The Chloride Vacu-vials® test employs the ferric thiocyanate chemistry. Chloride reacts with mercuric thiocyanate to liberate thiocyanate ion. Ferric ion reacts with thiocyanate ion to produce an orange-brown thiocyanate complex in proportion to the chloride concentration. Results are expressed as ppm (mg/L) Cl-.*Contains mercury. Dispose according to local, state or federal laws.