21/30437192 DC

This standard 21/30437192 DC BS EN 17685-1. Earthworks. Chemical tests is classified in these ICS categories:

• 13.080.99 Other standards related to soil quality
• 93.020 Earthworks. Excavations. Foundation construction. Underground works

This document describes a method for the determination of the loss on ignition (w_LOI) of fine, intermediate, composite and coarse soils, organic soils and anthropogenic materials (according to
EN 16907‑2 ) after ignition under air at 550°C.

The loss of mass suffered by these materials at 550 °C is usually due to the release of volatile compounds, water (absorbed, crystalized or structural) and gases from decomposition of organic matter and inorganic substances such as sulfur, sulphides or hydroxides (e.g. H₂O, CO₂, SO₂).

A method is given in Annex B in order to estimate the organic matter content (C_OM) from the value of w_LOI for clayed soils.