01920naa a2200217 a 450000100080000000500110000800800410001902200140006002400380007410000170011224501780012926000090030752011640031665300260148065300270150665300350153365300430156870000210161170000190163277300510165121216512024-12-11       2020    bl uuuu     u00u1 u    #d  a0026-065X7 a10.1016/j.microc.2019.1044162DOI1 aBABOS, D. V.  aA simple, rapid, green and non-destructive 19F time-domain NMR method for directly fluorine determination in powder of mineral supplements for cattle.h[electronic resource]  c2020  aA simple, rapid, green and non-destructive 19 F 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 19 F) spectrometer using a 10 mm probe with 10 μs dead time. Standard samples from 0 to 21,700 mg kg −1 F were prepared diluting the appropriate amount of BaF2 in the salts Na 2CO 3 : 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 −1 F. 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 −1 F. 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.  aDirect solid analysis  aFluorine determination  aMineral supplements for cattle  aTime domain nuclear magnetic resonance1 aGARCIA, R. H. S.1 aCOLNAGO, L. A.  tMicrochemical Journalgn.153, a. 104416, 2020.