The short version
Potassium dichromate is a hexavalent-chromium compound - the carcinogen of "Erin Brockovich" fame, lethal to cells at low doses. A Russian team dosed a culture of living microalgae with it, then added shungite to the same water. The shungite didn't just reduce the harm; it effectively erased it.
What they did
The test organism was
Scenedesmus quadricauda, a common green microalga used as a toxicity sensor. They ran three conditions: algae alone, algae + dichromate (3 mg/l), and algae + dichromate + shungite (100 g/l).
"при комбинированном воздействии бихромата калия и шунгита на популяцию Scenedesmus quadricauda токсическое действие бихромата калия снимается"
"under combined exposure of potassium dichromate and shungite, the toxic effect of the potassium dichromate is removed."
The result
- Dichromate alone: progressive cell death over the experiment
- Dichromate + shungite: living cells held at 98-99% for the whole run
In other words, the shungite pulled enough of the chromium out of solution (and/or neutralised its reactive damage) that the algae carried on almost as if the poison wasn't there.
Why it's worth knowing
It's one thing to show a sorbent lowers a metal concentration in a beaker. It's another to show living cells survive the dose because the mineral was present. This is a biological end-point - survival - not just a chemistry reading.
Sources
- Dallakyan G.A., Pogosyan S.I., Ipatova V.I., Ageeva I.V. (2014), "Инактивация токсического действия бихромата калия шунгитом на развитие микроводорослей", Токсикологический вестник:
cyberleninka.ru
