What is Langelier Saturation Index?
What is 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.
How do I find my Langelier index?
LSI Formula:
- LSI = pH – pHs
- 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. D = Log10[alkalinity as CaCO3] = 1.53.
What does Langelier index measure?
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.
What is LSI index?
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).
How to calculate Langelier Index?
If you take your water sample to a pool shop for analysis their software will usually calculate the LSI. It’s computed from indices of temperature, calcium and alkalinity using the following formula: Langelier Saturation Index (LSI) = pH + Ti + Ci + Ai -12.1
What is the Langelier Index (LI)?
Definition – What does Langelier Index (LI) mean? The Langelier index (LI) is the difference between the actual (measured) pH and the calculated pH of water. It gives an approximate measure of the degree of saturation of calcium carbonate in water.
What is calcium saturation index?
The saturation index (SI) is defined as the ratio of the calcium carbonate apparent ionic product to the apparent solubility product of the considered solid (calcite or aragonite) The SI is related to the free energy (or chemical affinity, A) of the dissolution reaction of the considered mineral by.