Abstract
In an amendment to the Japanese leaching test (JLT13), several important modifications have been adapted to improve the accuracy of analytical data. From the viewpoint of metal analysis, the change made in the filtration method (use of membrane filter) is the most important point affecting the analytical results of the leaching test. In the present paper, the effect of the filter material on the analytical results of the leaching test was first examined using different types of filter paper (glass fiber filter, mixed-cellulose ester type membrane filter, and hydrophilic PTFE type membrane filter) in leaching tests for incineration fly ash, sewage sludge and sewage sludge incineration ash. As a result, leachate containing a large amount of organic matter (sewage sludge), had hardly been filtered with hydrophilic PTFE type membrane filter, and some metals showed significantly low concentrations in the PTFE-filtered leachate. In addition, some severe interferences in the application of inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS) are described for multi element analysis of waste materials including leachate samples.
