What is the Langelier Saturation Index?
The Langelier Saturation Index (LI), a measure of a solution’s ability to dissolve or deposit calcium carbonate, is often used as an indicator of the corrosivity of water. The Langelier Index is defined as the difference between actual pH (measured) and calculated pHs.
What does LSI indicate?
LSI is a measure of the disparity between the pH of the system and the pH at which the system is saturated with calcium carbonate: LSI = pH – pH of saturation. As such, the LSI indicates the change in pH required to bring water to equilibrium.
What items are tested to determine the Langelier Saturation Index?
The Langelier Index is an approximate measure of the saturation degree of calcium carbonate (CaCO3) in water. It is calculated using the Hydrogen Ion (pH), Alkalinity (CaCO3), Calcium concentration, Total Dissolved Solids, and water temperature of a tap water sample.
How is Langelier calculated?
LSI Formula: pHs = (9.3 + A + B) – (C + D) where: A = (Log10[TDS] – 1)/10 = 0.15. B = -13.12 x Log10(oC + 273) + 34.55 = 2.09 at 25°C and 1.09 at 82°C. C = Log10[Ca2+ as CaCO3] – 0.4 = 1.78.
How do I find my Langelier index?
The formula to get your LSI index is: pH + Temperature Index + Calcium Index + Alkalinity Index – TDS index. The resulting number you’ll get is your Pool LSI.
What is Langelier Index & Ryznar Stability Index?
The Ryznar index is based loosely off of the Langelier saturation index that was created in the 1930s. The Ryznar index is logarithmic, similar to other indices that are used to calculate calcium carbonate formation. Generally, any value above 6 indicates that the water is likely to form a calcium carbonate scale.
What does the Langelier Saturation Index ( LSI ) mean?
The Langelier Saturation Index (LSI) is a cornerstone of the Orenda program. The LSI is the unbiased measurement of water balance, as defined by calcium carbonate saturation. It determines if our water is aggressive/corrosive (low LSI), balanced, or scale-forming (high LSI).
What is the Langelier Saturation Index for calcium carbonate?
Langelier Saturation Index (LSI) The Langelier Saturation index (LSI) is an equilibrium model derived from the theoretical concept of saturation and provides an indicator of the degree of saturation of water with respect to calcium carbonate. Water with a Langelier saturation index of 1.0 is one pH unit above saturation.
What is the Langelier saturation level of water?
The Langelier saturation level approaches the concept of saturation using pH as a main variable. The LSI can be interpreted as the pH change required to bring water to equilibrium. Water with a Langelier saturation index of 1.0 is one pH unit above saturation.
What happens when the LSI of water is negative?
The LSI is a measure of the balance between pH and calcium carbonate (CaCO 3)—as the LSI value becomes more negative, the water is increasingly under-saturated with CaCO 3 and therefore has a greater corrosion potential.