Identifying the origin of rock phosphates and phosphorous fertilisers using isotope ratio techniques and heavy metal patterns

摘要: Rock phosphates, the main sources of P-fertilizers, vary considerably in their content radioactive elements such as 238U, 235U and daughters non-radioactive toxic heavy metals Cd, Cr, Co, Pb depending on origin. To minimize risks associated with transfer these hazardous into environment, it is preferable to use rock phosphates from origins characterized by a low elements-content. In this context, reliable method needed which allows identify origin P-fertilizers. study, metal pattern, U/P2O5 Sr/P2O5 well R(234U/238U) R(87Sr/86Sr) are tested means discriminate P-fertilizers regards The application isotope ratio technique „fingerprinting method“ offers possibility geographical While pattern phosphate may change during acid attack applied fertilizer production process, U Sr ratios same almost identical. This property makes measurements powerful tool for fingerprinting raw material used P fertilizers. R(235U/238U) was indicator anthropogenic investigated samples.