Chloride is a negatively charged ion that is formed when chlorine gains an additional electron. It is generally found in the form of salts, most commonly sodium and potassium salts, which are very soluble in water.
The Chloride sensor is an Ion Selective Electrode (ISE) that measures and tests for chloride ions in the water.
Our chloride sensors can be fitted on many of our probes - find some examples below.
To see all of the probes that feature chloride please visit the Products section
The Aquasonde-2000 has 2 spare ports. They can house either 1x ISE sensor and 1x Optical sensor. Or it can house 2x ISE sensor.
Solid state sensors offer a significant advantage over gel-filled sensors offered by other manufacturers. Such gel-filled sensors have a limited lifespan, while solid state sensors like this one won’t deteriorate over time as long as it is dry.
Successful calibration of an ISE is fairly complex. On its initial use, a three-point calibration is required. Generally, this is at 10ppm and 100ppm of the sensor’s specific calibration solution, with the third point intended to characterise the effect of temperature on that specific sensor. The third point is a second calibration at 10ppm however, this calibration point must be at least 10 degrees colder than the initial point. This is because the measured concentration varies with temperature as well as the actual concentration of the ion.
The good news is that once this calibration is complete, subsequent calibrations do not require the third point to be re-done, making future calibrations much simpler to perform.
An ideal ISE sensor would only allow the ion in question to be passed through the membrane. However, in practice, all ion selective electrodes suffer from interference from ions which are similar in nature to the target ion. For this reason, ISE Electrodes are not recommended for use in brackish or salt water due to the high level of interfering ions.
Installing the chloride sensor into an Aquaprobe is a very simple process. Simply unscrew the blanking plug from an appropriate aux socket, apply some silicon grease to the thread of the sensor (grease provided), and screw in the sensor. After installation full calibration is required.
Nearly all natural waters contain chloride and the concentrations vary greatly depending on the mineral content of the surrounding rock or soil. Aside from natural sources, chloride enters water from various human sources including: agricultural runoff, road salting, wastewater from industry, and produced water from gas and oil wells.
You can test for chloride ions in water easily with Aquaread’s chloride sensor.
To use our sensor, first install it into your probe of choice, then perform a full calibration using dilutions from the stock calibration solution. It’s ready to use once calibration is complete. Then you can put the probe into the body of water, allow the reading to stabilise, and take your measurement.
Aquaread’s chloride meter can be used for measuring chloride in water in both long-term monitoring or spot testing. Our chloride probes and other water testing equipment are designed for use in the field, rather than in a laboratory, and can be used in a variety of commercial and industrial settings – as well as for environmental water quality monitoring.
Measuring the chloride level in water is often part of an industrial process where a certain level of water purity is required. Chloride meters are also used to monitor the concentration in wastewater that is pumped back out into rivers and streams. Production of concrete can also require chloride testing because high levels of chloride can corrode the metal reinforcements that are present within a concrete structure.