Ion-selective electrodes in potentiometric titrations; a new method for processing and evaluating titration data

2015 ◽  
Vol 888 ◽  
pp. 36-43 ◽  
Author(s):  
Kim Granholm ◽  
Tomasz Sokalski ◽  
Andrzej Lewenstam ◽  
Ari Ivaska
Keyword(s):  
New Method ◽  
Ion Selective Electrodes ◽  
Potentiometric Titrations ◽  
Titration Data

scholarly journals Turmeric Powder as a Natural Heavy Metal Chelating Agent: Surface Characterisation

2017 ◽  
Vol 60 (1) ◽  
pp. 1-8
Author(s):  
Amtul Qayoom ◽  
Syed Arif Kazmi ◽  
Saeeda Nadir Ali
Keyword(s):  
Binding Sites ◽  
Chelating Agent ◽  
Spectroscopic Studies ◽  
Surface Characterisation ◽  
Energy Dispersion Spectroscopy ◽  
Oh Groups ◽  
Potentiometric Titrations ◽  
Metal Chelating ◽  
Infra Red ◽  
Titration Data

The present study was conducted to investigate surface properties of turmeric in order to evaluateits detoxification potential and ability to sequester toxic metals ions. Scanning Electron Microscopy (SEM),Energy Dispersion Spectroscopy (EDS), Infra-Red (IR) spectroscopy and potentiometric titrations wereemployed for characterisation of the surface of turmeric powder. Spectroscopic studies revealed that thesurface of turmeric powder was porous mainly composed of polymeric -OH , -NH , -CH2 , -COO and-OH groups of polysaccharides. From potentiometric titrations and modelling of batch titration data, it wasfound that surface of the turmeric contains at least four binding sites with pKa values 3.56 (pK1), 4.83(pK2), 7.68 (pK3) and 10.4 (pK4). Turmeric powder contains highest concentration of amino and hydroxylgroups for the pK4 values i.e., 0.55 mmol/ g. The total binding sites concentration for turmeric powderwas 1.2 mmol/ g.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

A new method for the determination of nitrates

1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  
New Method
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