What is the time limit for filtering the TCLP leachates after completing the tumbling?
There is no time limit specified in the TCLP method for the filtration of the leachate after tumbling. However, the lack of a specification should not be perceived as permission to delay filtration. The method assumes that the filtration will be conducted as soon as practical after the completion of the tumbling (e.g., within 2 hours). If you are running a number of samples, it may take only a short while to filter all of the leachates, but you should not delay this filtration any longer than necessary (e.g., do not wait a day, but start the filtrations as soon as the tumbling is complete and proceed through all of the samples). Additionally, for samples that are difficult to filter, the samples may be centrifuged and then the supernates can be quickly filtered.