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| 001 | 441221 | ||
| 005 | 20250729150459.0 | ||
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| 100 | 1 | _ | |a Vogel, Christian |0 P:(DE-H253)PIP1083501 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Chromium (VI) in phosphorus fertilizers determined with the diffusive gradients in thin-films (DGT) technique |
| 260 | _ | _ | |a Heidelberg |c 2020 |b Springer |
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| 520 | _ | _ | |a Phosphorus (P) fertilizers from secondary resources became increasingly important in the last years. However, these novel P-fertilizers can also contain toxic pollutants such as chromium in its hexavalent state (Cr(VI)). This hazardous form of chromium is therefore regulated with low limit values for agricultural products even though the correct determination of Cr(VI) in these fertilizers may be hampered by redox processes, leading to false results. Thus, we applied the novel diffusive gradients in thin-films (DGT) technique for Cr(VI) in fertilizers and compared the results with the standard wet chemical extraction method (German norm DIN EN 15192) and Cr K-edge X-ray absorption near-edge structure (XANES) spectroscopy. We determined an overall good correlation between the wet chemical extraction and the DGT method. DGT was very sensitive and for most tested materials selective for the analysis of Cr(VI) in P-fertilizers. However, hardly soluble Cr(VI) compounds cannot be detected with the DGT method since only mobile Cr(VI) is analyzed. Furthermore, Cr K-edge XANES spectroscopy showed that the DGT binding layer also adsorbs small amounts of mobile Cr(III) so that Cr(VI) values are overestimated. Since certain types of the P-fertilizers contain mobile Cr(III) or partly immobile Cr(VI), it is necessary to optimize the DGT binding layers to avoid aforementioned over- or underestimation. Furthermore, our investigations showed that the Cr K-edge XANES spectroscopy technique is unsuitable to determine small amounts of Cr(VI) in fertilizers (below approx. 1% of Cr(VI) in relation to total Cr). |
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| 700 | 1 | _ | |a Hoffmann, Marie C. |0 P:(DE-H253)PIP1086412 |b 1 |
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| 700 | 1 | _ | |a Adam, Christian |0 P:(DE-H253)PIP1083510 |b 5 |
| 773 | _ | _ | |a 10.1007/s11356-020-08761-w |g Vol. 27, no. 19, p. 24320 - 24328 |0 PERI:(DE-600)2014192-0 |n 19 |p 24320 - 24328 |t Environmental science and pollution research |v 27 |y 2020 |x 1614-7499 |
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