New method for the study of surface acidity of zeolites by NH3-TPD, using a pH-meter equipped with an ion selective electrode

2006 ◽  
Vol 112 (1-2) ◽  
pp. 13-18 ◽  
Author(s):  
R. Le Van Mao ◽  
N. Al-Yassir ◽  
L. Lu ◽  
N. T. Vu ◽  
A. Fortier
Keyword(s):  
Surface Acidity ◽  
New Method ◽  
Ion Selective Electrode ◽  
Selective Electrode

scholarly journals A New method for ISE construction for methyl orange dyes and using for indirect determination of Amitriptyline Hydrochloried drug

2015 ◽  
Vol 12 (1) ◽  
pp. 188-196
Author(s):  
Baghdad Science Journal
Keyword(s):  
Methyl Orange ◽  
Response Time ◽  
Electrode Surface ◽  
Ion Pair ◽  
New Method ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Internal Solution ◽  
Indirect Determination

A new method for construction ion-selective electrode (ISE) by heating reaction of methyl orange with ammonium reineckate using PVC as plasticizer for determination methyl orange and determination Amitriptyline Hydrochloried drug by formation ion-pair on electrode surface . The characteristics of the electrode and it response as following : internal solution 10-4M , pH (2.5-5) ,temperature (20-30) and response time 2 sec. Calibration response for methyl orange over the concentrationrange 10-3 -10-9 M with R=0.9989 , RSD%=0.1052, D.O.L=0.315X10-9 MEre%=(-0.877- -2.76) , Rec%.=(97.230 -101.711) .

Determination of cupric ion concentrations in marine waters: an improved procedure and comparison with other speciation methods

2016 ◽  
Vol 13 (1) ◽  
pp. 140 ◽  
Author(s):  
Tara N. Tait ◽  
Lisa M. Rabson ◽  
Rachael L. Diamond ◽  
Christopher A. Cooper ◽  
James C. McGeer ◽  
...  
Keyword(s):  
Salt Water ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Calibration Method ◽  
New Method ◽  
Ion Selective Electrode ◽  
Calibration Data ◽  
Selective Electrode ◽  
Ion Concentrations ◽  
Cupric Ion

Environmental context A Cu ion-selective electrode is potentially an excellent tool for cupric ion measurements in salt water, but it is prone to poor reproducibility. We show that dramatic improvements can be obtained by using a Cu ion-selective electrode and a one-point calibration method that corrects for electrode fouling. The method shows promise to be used to collect data on toxic cupric ion concentrations in saltwater environments. Abstract Free Cu is often used as an indicator for potential Cu toxicity. Free ionic Cu2+ was measured using a flow-through ion-selective electrode (ISE). Four different marine samples were collected from various locations and analysed during a fixed-pH Cu titration using an external standard calibration ISE method. Free cupric determinations in the range 10–12 to 10–7molL–1 were consistent with published literature but replicate measures showed up to four orders of magnitude variability. To improve reproducibility, an internal calibration method was developed. The new method was validated using artificial seawater with added tryptophan as the model ligand. The free Cu measured using the improved method showed the same trends as the external calibration data but reproducibility increased to an order of magnitude or better. The potential applicability of this new method was also highlighted in that it matches, in the environmentally and regulatory significant range of total Cu, with a fluorescence quenching method applied to one of the four samples. The ISE data do not agree with free ion concentrations estimated from anodic stripping voltammetry (ASV) though. This suggests that, at least for these samples, ASV responded to a larger fraction of total Cu than simply the inorganic complexes. Caution should be exercised when using ASV as a proxy for bioavailability because the trends in ASV-derived free Cu did not match the free Cu as estimated by ISE. This ability to more reliably measure free Cu is significant for predicting and measuring toxicity on Cu exposure.

A new method for chlorine determination in commercial pet food after decomposition by microwave-induced combustion

2015 ◽  
Vol 7 (10) ◽  
pp. 4315-4320 ◽  
Author(s):  
Marcelo G. Crizel ◽  
Carla A. Hartwig ◽  
Diogo L. R. Novo ◽  
Isis G. Toralles ◽  
Lucas Schmidt ◽  
...  
Keyword(s):  
New Method ◽  
Ion Selective Electrode ◽  
Pet Food ◽  
Selective Electrode

A new method for commercial pet food decomposition using microwave-induced combustion was developed for further determination of chlorine by ion selective electrode.

Titration of sulphates and lead using lead ion selective electrode

1981 ◽  
Vol 46 (2) ◽  
pp. 368-376 ◽  
Author(s):  
Josef Veselý
Keyword(s):  
Ionic Strength ◽  
Electrode Surface ◽  
Salt Content ◽  
Ion Selective Electrode ◽  
Lead Ion ◽  
Selective Electrode ◽  
Limit Of Determination ◽  
Total Salt Content ◽  
Automatic Titration

Titration of sulphates with lead perchlorate employing lead ion selective electrode indication was studied using additions of various organic solvents at different pH' and ionic strength values. As the optimum emerged systems with 60-70% 1,4-dioxane, pH' 5.3-5.6. After dehydration with sodium hydroxide, dioxane must be freed from the electrode surface-oxidizing impurities by their reduction with sodium metal and subsequent distillation. The method was applied to determination of sulphates in mountain spring waters. Units of ppm can be determined; the limit of determination, however, depends considerably on the content of dioxane, total salt content in the sample, and speed of the semi-automatic titration. Lead can be determined with EDTA in concentrations down to c(Pb2+) = 5 . 10-6 mol l-1.

Association of benflurone in aqueous solutions studied by measuring the activity of chloride ions

1986 ◽  
Vol 51 (11) ◽  
pp. 2437-2443
Author(s):  
František Kopecký ◽  
Mária Vojteková ◽  
Milan Pešák
Keyword(s):  
Aqueous Solutions ◽  
Chloride Ions ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Measured Range

The conventional activity of chloride ions was measured by an ion-selective electrode at 25 °C in aqueous solutions of benflurone, i.e. 5-(2-(N,N-dimethylamino)ethoxy)-7-oxo-7H-benzo(c)fluorene hydrochloride, without or with additions of KCl. These results suggest a gradual association of benflurone; the formation of a hetero-associate, (BH+)2Cl-, followed by higher associates was evaluated in the measured range up to 0.1 mol l-1.

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