E-WASTE RESEARCH at Jackson State University

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TCLP Test of E-waste Components

Dynamic Leaching Test of E-waste Components

Landfill Simulation Test

Biotoxicity Test of Materials in Crystal Liquid Displays

Treatment of E-waste for Safe Disposal




The Toxicity Characteristic Leaching Procedure (TCLP) is a standard method of U.S. EPA for testing whether or not a waste is hazardous. In this test, the samples were size-reduced to pass a 9.5-mm sieve, mixed with the extraction fluid at a liquid-to-solid ratio of 20:1 on weight basis, and agitated in a rotary extractor at 30 rpm and 22oC for a period of 18 hours. After the agitation, the samples were filtered through a 0.6 to 0.8 mm glass-fiber filter. The filtrate, defined as TCLP extract, was analyzed for contaminant concentrations. The extraction fluid #1 with a pH of 4.93 was used for most the E-waste samples.

The objectives of this study were: (1) to examine the existence and contents of toxic substances in different E-waste components, (2) to determine the leaching toxicity characteristics of toxicants in the components by the TCLP method, and (3) to identify the components which could fail the TCLP test and cause environmental hazards when being discarded or co-disposed with municipal wastes in landfills.

The samples on which the TCLP test was performed included desktop personal computers (PCs), notebook PCs, and cellular phones. The samples were separated into different component groups such as the casing, the printed wire board (PWB), and the display for the TCLP test.


E-waste samples for TCLP Test






                     Size Reduction                                               Agitation




                       Filtration                                                    Analysis