Investigation on Water Dissolution of ThCl4 Based Glass Using Dynamic Ion Selective Electrode Method

1991 ◽  
Vol 32-33 ◽  
pp. 273-278
Author(s):  
Y. Dai ◽  
Hong Hu ◽  
F.X. Gan
1984 ◽  
Vol 56 (14) ◽  
pp. 2919-2920 ◽  
Author(s):  
Brent A. Fulton ◽  
Clifton E. Meloan ◽  
Michael D. Wichman ◽  
Robert C. Fry

Author(s):  
Heba Kashour ◽  
Lina Soubh

In this study, two analytical methods were used to determinate the protein, the ammonia ion selective electrode method and dye binding method using orange G and the spectrophotometer at λmax 478 nm by determining the linearity, accuracy, precision, limit of detection and limit of quantitation of each. In comparison, the dye binding method was chosen for its accuracy, repeatability, sensitivity (LOD, LOQ) and speed of performance. After that, it was applied to samples of prepared plain yogurt to study effect of different properties (source, heat treatment and type) of used milk on protein content of plain yogurt.


2018 ◽  
Vol 3 (3) ◽  
pp. 193
Author(s):  
Husain Sosidi ◽  
Buchari Buchari ◽  
Indra Noviandri

<p>The phenyl-3-methyl-4-benzoyl-5-pyrazolone (HPMBP) synthesized and characterized as ionophore in potentiometric analysis of ion selective electrode method (ISE) with polytetrafluoroethylene (PTFE) as the supporting phase. The pH and concentration of the ionic strength adjuster (ISA) were varied to know at the optimum pH and concentration of the ion-selective electrode (ESI) KNO<sub>3</sub>, thus potential Nd<sup>3+</sup> gives the best performance. Before use the PTFE membrane was immersed in a chloroform-HPMBP solution of 1.5-2.0% w/v for 24 h. The pH variation of the buffer solution was adjusted to the pH range of 2-10 using HCl and NaOH solutions, whereas the concentration of KNO<sub>3</sub> varies from 10<sup>-1</sup> to 10<sup>-3</sup> M. The concentration range of Nd<sup>3+</sup> is between 10<sup>-2</sup> and 10<sup>-7</sup> M. The electrode potential measurement results (E<sub>Nd</sub>) obtained the best performance value at pH 4 with KNO<sub>3</sub> concentration of 10<sup>-2</sup> M, sensitivity (S) 18.39 ± 1.2 mV/decade and response time less than 23 s.</p>


1975 ◽  
Vol 58 (3) ◽  
pp. 477-481 ◽  
Author(s):  
Laszlo Torma

Abstract A rapid and precise method for the determination of fluoride in feeds employs HC1 extraction of the sample. Acetate buffer and sodium citrate are added to control pH and ionic strength. The amount of fluoride is calculated from a standard curve after measuring the potentials of standard and sample solutions. Eight collaborators participated in the study of the method. Statistical values on 3 pairs of samples were calculated. The standard deviation, precision, coefficient of variation, and bias, respectively, were: Pair 1, 0.005071, 0.001763, 3.09, 0.0034; Pair 2, 0.037122, 0.006475, 1.82, 0.0258; Pair 3, 0.034587, 0.013021, 2.63, 0.0227. The results from the proposed method agreed favorably with the values obtained by using the official final action AOAC method, 7.089. The average and standard deviation, respectively, for individual samples by the proposed method were: Sample 3, 0.049, 0.0029; Sample 4, 0.059, 0.0021; Sample 5, 0.334, 0.0114; Sample 6, 0.341, 0.0101; Sample 7, 0.511, 0.0219; Sample 8, 0.492, 0.0237. By the official method the values were: Sample 3, 0.049, 0.0041; Sample 4, 0.058, 0.0029; Sample 5, 0.334, 0.0055; Sample 6, 0.331, 0.0082; Sample 7, 0.517, 0.0183; Sample 8, 0.499, 0.0175. The ion selective electrode method has been adopted as official first action.


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