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loopdoend | 7 months ago

Wish there were some way to detect impurities like this at home.

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Joel_Mckay|7 months ago

There are very sensitive indicator drops used for identifying ceramic glazes containing lead on antique porcelain.

There are also handheld scanners that cost more than a car. And yes, people in the community scan every imported toy and or food item they see to start the FDA ban process when necessary. Should buy local when you can anyway. =3

account42|7 months ago

Tumeric isn't something grown locally in most places. And for powder you are pretty much always getting imports.

whiw|7 months ago

I am not a chemist, so take this with a pinch of salt: wouldn't lead chromate + sodium bicarbonate make lead carbonate, a white precipitate? Sodium bicarbonate is likely in your kitchen cupboard already.

adrianN|7 months ago

Pretty hard to see precipitated dust at concentrations in the ppm range.

BenjiWiebe|7 months ago

Not a chemist either but lead oxide is actually more soluble in water than lead chromate, so a double replacement reaction won't favor lead chromate -> lead oxide.

kragen|7 months ago

WP tells me lead chromate's solubility in water is 0.00001720 g/100 mL, so, no, it won't.

whiw|7 months ago

I meant lead carbonate, not lead oxide.

bluGill|7 months ago

I have found lead detection kits. However they are somewhat expensive and I'm not sure how well they work.

Joel_Mckay|7 months ago

Really? Lead test kits are $10 on amazon, and will include several dozen tests. The better kits will include paper to verify the tests still are working (short shelf life in the open.)

The sodium rhodizonate tests usually turn pink in the presence of traces of lead. These tests are intended for testing paints/ceramics, and may have false positives in the presence of zinc or copper etc.

Our local Griefers seem to have strong feelings about this information, but talk with your chemistry teacher if you want to understand the details about testing.

If a credible 3M brand test shows possible contamination, than consider sending a sample into a lab to figure out the details. =3

pfdietz|7 months ago

Hand held x-ray fluorescence spectrometer?

perihelions|7 months ago

I think those cost more than my entire kitchen.

jpmattia|7 months ago

And just like that, there was a mad rush of mass-spectrometer-for-home-use startups.