How to determine the levels of zinc containing corrosion inhibitors
Zinc Photometric Method (0-3 ppm)
The principal purpose of zinc analyses is to maintain proper treatment levels of zinc containing corrosion inhibitors. A very common inhibitor system uses a combination of two anodic inhibitors: phosphate and chromate. This combination gives a very significant reduction in overall corrosion and tuberculation.
How to measure turbidity of water
Turbidity, which is due to the presence of suspended matter in a finely divided state, can be interpreted as a lack of clearness or brilliance in a water. Turbidity should not be confused with color since a water may have a dark color but still be clear and not turbid. Clay, silt finely divided organic and inorganic matter, and microscopic organisms can all cause turbidity.
Turbidity is a measure of relative light transmission through a sample. Light not transmitted may be either obstructed or reflected by the particles in the sample.
How to determine sulfite in a sample
Sulfite Titrimetric Method(0-100ppm)
The determination of sulfite usually is made only on boiler waters or on waters that have been treated with catalyzed sodium sulfite for corrosion prevention. Generally speaking, sulfite is not present in natural water.
In boiler feedwater conditioning sodium sulfite is fed to a boiler to remove dissolved oxygen and thus prevent pitting.
How to determine chelate demand by titrimetric method
NTA Chelant Demand Titrimetric Method
NTA (nitrilotriacetic acid) is a chelant commonly applied in boiler water treatment to prevent the deposition of hardness and other heavy metal cations under boiler water conditions. NTA reacts with the metal cations, forming a soluble ring structure. The stability of the complex depends on the strength of the cation chelant interaction and is measured by how completely the metal is: “Locked - in” by the chelant.
How to determine metal ion concentration using photometric method
EDTA Chelant Demand Photometric Method
Theory of Test
When a complexometric dye is introduced to an alkaline solution of magnesium chelate, a bluish- purple color results. The absorbance of this neutral solution is arbitrarily considered to be a zero chelant demand. Hardness and heavy metal cations may be present in feedwater react with the system to produce a transition of color from bluish purple to red. This color change is proportional to the concentration of precipitating cations present.
How to determine hardness of water
Hardness, Titration Method (0-200 ppm) Theory of Test
How to quantify metal ion in water
EDTA Chelant Demand Titrimetric Method
EDTA (ethylenediaminetetraacetic acid) is a weak organic acid. When the sodium salt is applied to boiler feed water at a relatively high pH it is hydrolyzed to an organic anion able to form stable soluble organometallic complexes. Calcium, magnesium, iron and copper, metals that normally form troublesome deposits on boiler surfaces, remain in solution when chelated.