CEN/TS 14405:2004

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Equipment and reagents
   5.1 General
6 Sample pre-treatment
   6.1 General
   6.2 Sample preparation
   6.3 Test portion
   6.4 Determination of dry residue
7 Procedure
   7.1 Temperature
   7.2 Preparation
   7.3 Packing of the column
   7.4 Start-up of the test
   7.5 Collection of additional eluate fractions
   7.6 Further preparation of the eluates for analysis
   7.7 Blank test
8 Calculations
9 Test report
10 Test performance
Annex A (informative) Illustration of the column and
                      accompanying equipment
Annex B (informative) Suggestions for packing the column,
                      water saturation and establishment
                      and checking of equilibrium
                      conditions
   B.1 General
   B.2 Guidelines on column filling and packing
   B.3 Water saturation
   B.4 Equilibration and checking of equilibrium conditions
Annex C (informative) Background for the choices made in
                      developing this percolation test
   C.1 Introduction
   C.2 Particle size/particle size distribution
   C.3 Column dimensions
   C.4 Flow mode (up-flow/down-flow)
   C.5 Flow rate of the leachant
   C.6 L/S ratio and eluate fractions collected/duration of
       the test
   C.7 Nature of the leachant
   C.8 Temperature
   C.9 Beneficial use of the test results
Bibliography

This Technical Specification is applicable to determine the leaching behaviour of inorganic constituents fromgranular waste (without or with size reduction (see 6.2)). The waste body is subjected to percolation with wateras a function of liquid to solid ratio under specified percolation conditions. The waste is leached underhydraulically dynamic conditions. The method is a once-through column leaching test and the test resultsestablish the distinction between different release patterns, for instance wash-out and release under theinfluence of interaction with the matrix, when approaching local equilibrium between waste and leachant.NOTE 1 The mentioned specified percolation conditions are arbitrary and are not simulating a specific scenario.NOTE 2 Waste materials that show a saturated hydraulic conductivity between 10-7 m/s and 10-8 m/s can be subjected to this test, but it can be difficult to maintain the imposed flow rate. If a waste shows a saturated hydraulic conductivity below 10 -8m/s, the test should not be carried out. (See C.5 for a definition of �hydraulic conductivity�.)NOTE 3 This procedure is generally not applicable to biologically degrading materials and materials reacting with the leachant, leading, for example, to excessive gas emission or excessive heat release.NOTE 4 This procedure is applicable to materials showing solidification in the column, if the final hydraulic conductivity is within the specified range (see NOTE 1).