The SMS-22 sulfide ion measurement system from Electro-Chemical Devices (ECD) can be quickly installed with no special tools, and it features user-selectable automated sequential sampling of sulfide ions in water.

Hydrogen sulfide (H2S) is a gas that dissolves in water and gives it a “rotten egg” odor.  H2S is present in well water, municipal wastewater and wastewater produced by refineries, tanneries, chemical plants, and paper and pulp facilities. It is typically formed in environments prone to the creation of septic conditions. In addition to odors, excessive concentrations of H2S in wastewater can lead to corrosion and structural damage to municipal water/waste infrastructure including equipment and piping.

The SMS-22 sulfide measurement system was designed to save time and labor costs for municipal water operations by completing all the necessary steps to measure sulfide ions in a water sample. Because sulfide ions only exist at high pH values, this is a multi-step process. The SMS-22 conditions the sample, measures the sulfide, neutralizes the sample, measures the pH and drains and rinses the cell. After measurement, the highly caustic sample pH is reduced to a safe level near pH 8.

The ECD SMS-22 is a sequential sampling analyzer. Featuring automated sequential sampling, the C-22 analyzer controls the sequential sampling with a combination of relays and timers. Sampling times are easily adjustable from two samples per hour to 10 samples per hour. The system also offers very low reagent consumption. The system uses a sulfide ion selective electrode (ISE) to measure the total amount of sulfide present in the sample. ISE-based S-2 measurement provides a wide measurement ranges of 0 to 5 ppm and up to 500 ppm using electrode cartridges.