Well, we're talking about very small effects here at the lower levels of exposure. The impact on any one child would be impossible to discern - there ~may~ be a risk at a population level, but that's a more complex issue
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Replying to @GidMK
Population level? So meaning the long term toxicity becoming something that actually has effect on our genes and changes our dna structure generations down the line? Like viruses can do?
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Replying to @LiveIdiotFree
Nope. Meaning the effect on individuals is basically undetectable, you have to look at entire populations to discern an effect. Worst case, individual kids might be losing a fraction of an IQ point if that at low doses
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Replying to @GidMK
How would a epidemiological study detect a small IQ drop, unless by comparison to a prior generation, correct?
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Replying to @BGLTHMND
Nope, you'd compare between exposed and unexposed people, IQ changes between generations anyway
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Replying to @GidMK
I guess I was assuming that there would be no statistically significant population of unexposed.
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Replying to @BGLTHMND
Usually there are levels of exposure, and as with anything the dose makes the poison
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So now we're looking at an infant who is it reasonable to say has over exposure to heavy metals in their environment entering their body in basically all ways possible?
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Replying to @LiveIdiotFree @BGLTHMND
Nah the exposure limits usually take into account multiple sources of exposure, that's why they're so conservative. Remember, we're talking a few parts per billion a day/week as the maximum dose here
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Hmmm. Ok so its all about the amount at the time of exposure. Not exposure to little bits here and there...
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Pretty much. I mean, formaldehyde can easily kill you, but there's formaldehyde in pears! Just not enough to be a problem
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Right but why is it a concern when these things get into our water for instance... Is that just sensationalized for media?
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Replying to @LiveIdiotFree @BGLTHMND
Partly. The detection limits are set for a reason - if you find amounts above the detection limit, it's a problem. Even then, might not actually cause harm, but it's something that the health authority will have to check out
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