What’s your poison?

Science
What’s your poison?

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Robert Bruce Thompson, author of books on everything from PC Hardware to Astronomy, is working on a new book for Make: the Illustrated Guide to Home Chemistry Experiments. So, we’ve got chemistry on our mind here, which led Dale Dougherty, the Publisher of Make, to ask Robert:

I read a story last week about the alarmingly high levels of mercury found in fish in the top sushi places in Manhattan. Ever since, I’ve been wondering is it possible/feasible/reasonable to test for mercury in fish — a DIY mercury test kit. I doubt you could do this in restaurant so let’s presume that this is a test kit for store-bought fish.

The answer for mercury is a bit complex:

The problems are that mercury is toxic at unbelievably low levels and that it is a cumulative poison, which is to say it isn’t excreted. Accordingly, the allowable levels are set so low that there’s no chance they could be detected by any wet chemistry test with a sample of any reasonable size.

I was pretty sure of my facts, but just to be certain I ran them past organic chemist Dr. Paul Jones. His response was, “Maybe you could use a wet chemistry test if you had an entire 500-pound tuna for your sample, but otherwise you’d have to use instrumental tests.”

Organic chemist Dr. Mary Chervenak points out the Reinsch Test for mercury (which also produces a positive for several other heavy metals). You dissolve the sample in dilute HCl and put a copper strip in the solution. Any mercury present plates out on the copper as a silvery mirror. The trouble is, if enough mercury is present to produce a visible mirror with the Reinsch test, that sample has enough mercury in it to poison everyone in a radius of several blocks.

Robert’s got more details over at his daynotes journal, and a couple of other tests have come to our attention since Dale’s original question. Dale sent a link to a Heavy Metals Test (Robert posted his thoughts on this test in his journal as well), and Popular Science just posted a link to a portable blood test for heavy metals. Have any of you come across some interesting tests for poisons in your body, food, or environment? What results have you had?

From The Maker Store:



Illustrated Guide to Home Chemistry Experiments by Robert Bruce Thompson

Price: $34.99

Pre-order/Buy: Maker store – Link.

For students, DIY hobbyists, and science buffs, who can no longer get real chemistry sets, this one-of-a-kind guide explains how to set up and use a home chemistry lab, with step-by-step instructions for conducting experiments in basic chemistry. Learn how to smelt copper, purify alcohol, synthesize rayon, test for drugs and poisons, and much more. The book includes lessons on how to equip your home chemistry lab, master laboratory skills, and work safely in your lab, along with 17 hands-on chapters that include multiple laboratory sessions.

5 thoughts on “What’s your poison?

  1. crazzy says:

    Two ideas that could work are either a mercury film electrode, though nearly impossible to get for the home lab, or, even more weird, antibodies against lead and an ELISA test with those. It might be possible to create AB against lead in special immunsuppressed mouse strains. Anyway not that practical. Just dont eat too much fish! Many species are endangered anyway…

  2. dext3r says:

    just wondering, does the mercury that plates out on the copper strip change the resistance of the copper? Could you run a super tiny voltage across the plate, read its change in resistance and then run the resulting voltage through an opamp to increase it to readable levels or something? sort of like a digital pH meter? (sorry if im totally wrong)

  3. David Feather says:

    I’m still waiting for the test results to come back on my Kinoki foot patch. Just need to make sure there’s no ASBESTOS in my body, you know. When I find out, I’ll let you all know.

  4. Ben Trovato says:

    Pity that ordering some chemicals will get you on a DHS watchlist or worse…

  5. chemistry experiments says:

    i am going to buy it

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I'm a tinkerer and finally reached the point where I fix more things than I break. When I'm not tinkering, I'm probably editing a book for Maker Media.

View more articles by Brian Jepson

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