How is LOI calculated?
How is LOI calculated?
Determine % loss on ignition by dividing “initial loss” by initial weight of sample and multiply by 100.
How do you check for ignition loss?
The simple test typically consists of placing a few grams of the material in a tared, pre-ignited crucible and determining its mass, placing it in a temperature-controlled furnace for a set time, cooling it in a controlled (e.g. water-free, CO2-free) atmosphere, and redetermining the mass.
What does high loss on ignition mean?
A high loss on ignition can indicate prehydration and carbonation, which may be caused by improper and prolonged storage or adulteration during transport or transfer (PCA, 1988).
What is LOI in Catalyst?
The Loss on Ignition (LOI) is an important analytical parameter in the assay of petrochemical catalysts. Loss on ignition with specified ignition temperature and time is done for fresh, regenerated, used, and spent catalysts, catalyst supports, and molecular sieves of various shapes and sizes, including fines.
What is LOI of cement?
In the cement industry, use of the term Loss on Ignition (LOI) normally refers to a mass loss in a sample heated to up to a maximum of 1,000 °C. The cement industry utilizes the LOI method to determine the water content and/or carbonation in the cement as these reduce the quality.
What does LOI measure?
Loss on ignition (LOI) is one of the most widely used methods for measuring organic matter content in soils but does not have a universal standard protocol. A large number of factors may influence its accuracy, such as furnace type, sample mass, duration and temperature of ignition and clay content of samples.
What is LOI in sand?
Loss on Ignition (LOI)—AFS 5100-00-S Loss on ignition determines the total amount of combustible material in the green sand. The green sand sample is fired at 1,800F until it reaches a constant weight. The quantity of gas forming materials in the green sand will affect casting results.
What is LOI test?
The Limiting Oxygen Index (LOI) test is a widely used research and quality control tool for determining the relative flammability of polymeric materials.
What is loss on ignition method?
The Loss-on-Ignition method (LOI) is widely used for estimating organic matter in soils and lake sediments. The weight losses observed at temperatures above 400°C can be mostly ascribed to the destruction of soil organic matter (SOM) and structural water losses from clay minerals (Hoogsteen et al.
Why is loss on ignition important?
The percentage weight lost on ignition gives a crude measure of the organic content of the sediment. Generally, percentage loss on ignition values show an inverse relationship with percentage dry weight values.
Why LOI is important in determination of the composition of a sample?
Dean (1974) evaluated the method and concluded that LOI provides a fast and inexpensive means of determining carbonate and organic contents of clay-poor calcareous sediments and rocks with precision and accuracy comparable to other, more sophisticated geochemical methods.
What is LOI value?
The LOI is a fire reaction property used to quantify the flammability of organic polymers and composite materials. The LOI is defined as the minimum percentage of oxygen needed to sustain flaming combustion.