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We are having an outdoor night for the teens in our area and will be dooing ski dooing etc. but the snow is begining to melt and we are looking for some other things to do with them outdoors, don't have to be too long...

Suppose I have a sample of soil. What can I do with it to determine how much (concentration) Mercury is in it? Is there a color indicator strip for Mercury like there is to measure pH? Or do I have to use a fancy machine like a spectrometer...? thanks