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Some phosphate rock deposits have very high levels of cadmium. Phosphate fertilizers derived from high Cd rocks can have up to 100 ppm cadmium.
by pfdietz 2y ago
Some phosphate rock deposits have very high levels of cadmium. Phosphate fertilizers derived from high Cd rocks can have up to 100 ppm cadmium.
- compass_copium 2y agoThis is much cleaner--35 /ppb/. Really irresponsible and bad journalism.
- perihelions 2y ago- "up to 100 ppm cadmium" This is remarkable, and leads to me question what numbers this article is reporting. Their cadmium figures are parts-per-billion—ranging 30–45 μg/L. That seems impossibly low for something that's mostly phosphate; i.e., the EU's inorganic fertilizer standard[0] is 60 mg/kg, and they call 20 mg/kg "low-cadmium". This would appear to be several order of magnitudes lower cadmium than "low-cadmium" fertilizer. That doesn't sound very plausible, does it? Given their common component. OP's using μg/L. What is a "liter" in the denominator? That'd be an odd unit for measuring a dry powder. Is it liters of the solvent they dissolved the sample in, before running the mass spec? Was it intended to be reported as a a quantitative measurement, at all? (Was there maybe a communication error between the lab technician and the journalist?) [0] https://www.europarl.europa.eu/news/en/press-room/20181119IPR19407/fertilisers-cadmium-parliament-and-council-negotiators-reach-provisional-deal https://www.europarl.europa.eu/news/en/press-room/20181119IP... (Fertilisers/cadmium: Parliament and Council negotiators reach provisional deal")