This test method is a procedure that uses Colilert-18 to detect and quantify total coliforms and E. coli in wastewater through enzymatic reactions. When incubated at 35°C for 18 hours, the presence of total coliforms is indicated by a color change to yellow, and E. coli—a key fecal indicator—is confirmed by fluorescence under UV light.
This test method is a colorimetric method used to determine ferrous iron (Fe²⁺) concentration in water and wastewater. The method utilizes 1,10-phenanthroline, which forms an orange-red complex with ferrous iron that can be measured spectrophotometrically.
This test method is a procedure for determining total fluoride in water and wastewater using an ion-selective electrode (ISE). This method is widely used due to its simplicity, speed, and ability to measure a wide range of fluoride concentrations without complex instrumentation.
This test method is a standard titrimetric procedure used to measure total hardness and calcium hardness in water, both expressed as mg/L of calcium carbonate (CaCO₃). Hardness is primarily due to the presence of calcium (Ca²⁺) ions.
This test method is a standardized method for the determination of cyanide in water and wastewater samples. Cyanide in the sample reacts with a pyridine-barbituric acid reagent to form a colored complex, the intensity of which is measured using a spectrophotometer at a specific wavelength.
This test method is a standard procedure for measuring dissolved oxygen (DO) in water and wastewater samples using a membrane electrode (electrochemical sensor). This method is widely used for environmental monitoring, wastewater treatment, and water quality assessments.
This test method describes the enzyme-substrate-based detection of total coliforms and Escherichia coli in drinking water, surface water, and wastewater using the Colilert® test. This method is based on defined substrate technology, where specific enzymes produced by coliforms and E. coli react with added substrates to produce color and fluorescence, allowing for easy detection after… Continue reading Coliform / E.coli [P/A (18 hr)]
This test method describes the standardized procedure for measuring the electrical conductivity of water and wastewater, which reflects the sample’s ability to conduct electrical current due to the presence of dissolved ionic species (such as salts, acids, and bases). Conductivity is a key indicator of total dissolved solids (TDS) and overall water quality.
This test method describes the enzyme-substrate-based detection of total coliforms and Escherichia coli in drinking water, surface water, and wastewater using the Colilert® test. This method is based on defined substrate technology, where specific enzymes produced by coliforms and E. coli react with added substrates to produce color and fluorescence, allowing for easy detection and… Continue reading Coliform / E.coli [Quanti-Tray (18 hr)]
This test method describes the enzyme-substrate-based detection of total coliforms and Escherichia coli in drinking water, surface water, and wastewater using the Colilert® test. This method is based on defined substrate technology, where specific enzymes produced by coliforms and E. coli react with added substrates to produce color and fluorescence, allowing for easy detection and… Continue reading Coliform / E.coli [Quanti-Tray (24 hr)]