Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 19, 2002
Publication Date: August 20, 2002
Technical Abstract: Phosphate fertilizers enrich soil Cd, and the Cd:Zn ratio is much higher than soil Cd. Normally Zn inhibits plant uptake of Cd, and plant Zn inhibits absorption of plant Cd by animals. Thus fertilizer Cd has appeared to comprise higher risk than other Cd sources. On the other hand, recent research has shown that Zn, Fe and Ca malnutrition induced by subsistence rice consumption caused humans to absorb more food Cd than other populations who obtain more bioavailable Zn, Fe and Ca from other foods. Further, paddy rice rejects soil Zn but accumulates Cd, opposite the response of other crops. Thus, although Cd in phosphate fertilizer should comprise higher risk to humans than other Cd sources, dietary Cd bioavailability and risk is much lower for groups other than subsistence rice consumers. Implications of these new understandings of environmental Cd risks to consumers will be discussed.