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- W2986099504 abstract "Abstract A simple, rapid, green and non-destructive 19F time-domain nuclear magnetic resonance (TD NMR) method for fluorine determination directly in the powder of cattle mineral supplements is presented. The measurements were performed in a 0.49 T (18.76 MHz for 19F) spectrometer using a 10 mm probe with 10 μs dead time. Standard samples from 0 to 21,700 mg kg −1F were prepared diluting the appropriate amount of BaF2 in the salts Na2CO3: NaCl (1:1 w/w) that are normally used in the mineral supplements. The intensity of the free induction signal (FID), measured at 10 μs after 90° pulse and the fluorine content was used in an univariate model, with a limit of detection of 388 mg kg−1F. A partial least square model was also built using all FID data points and Fluorine content and yield a standard error of validation of 199 mg kg−1F. Accuracy was assessed by addition / recovery tests the analysis for two mineral supplements for cattle with trueness from 81 to 120%. Therefore, this is a green (non-chemical waste), simple (minimal sample preparation), fast (20 min) alternative method for determination of F in cattle mineral supplements." @default.
- W2986099504 created "2019-11-22" @default.
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- W2986099504 date "2020-03-01" @default.
- W2986099504 modified "2023-10-18" @default.
- W2986099504 title "A simple, rapid, green and non-destructive 19F time-domain NMR method for directly fluorine determination in powder of mineral supplements for cattle" @default.
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- W2986099504 doi "https://doi.org/10.1016/j.microc.2019.104416" @default.
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