scholarly journals Detection of Bromide Ions in Water Samples with a Nanomolar Detection Limit using a Potentiometric Ion-selective Electrode

2019 ◽  
pp. 1601-1609 ◽  
Author(s):  
Lijuan Kou ◽  
Keyword(s):  
Detection Limit ◽  
Water Samples ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Nanomolar Detection ◽  
Bromide Ions

scholarly journals A chalcohalide glass/alloy based Ag+ ion - selective electrode with nanomolar detection limit

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Lei Li ◽  
Haiwei Yin ◽  
Yang Wang ◽  
Jianhua Zheng ◽  
Huidan Zeng ◽  
...  
Keyword(s):  
Detection Limit ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Nanomolar Detection ◽  
Glass Alloy

scholarly journals Ionic Liquid-Multiwalled Carbon Nanotubes Nanocomposite Based All Solid State Ion-Selective Electrode for the Determination of Copper in Water Samples

Water ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 2869
Author(s):  
Cecylia Wardak ◽  
Karolina Pietrzak ◽  
Małgorzata Grabarczyk
Keyword(s):  
Carbon Nanotubes ◽  
Ionic Liquid ◽  
Solid State ◽  
Multiwalled Carbon Nanotubes ◽  
Water Samples ◽  
Limit Of Detection ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Multiwalled Carbon ◽  
Copper Determination

A new copper sensitive all solid-state ion-selective electrode was prepared using multiwalled carbon nanotubes-ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate) nanocomposite as an additional membrane component. The effect of nanocomposite content in the membrane on the electrode parameters was investigated. The study compares, among others, detection limits, sensitivity, and the linearity ranges of calibration curves. Content 6 wt.% was considered optimal for obtaining an electrode with a Nernstian response of 29.8 mV/decade. An electrode with an optimal nanocomposite content in the membrane showed a lower limit of detection, a wider linear range and pH range, as well as better selectivity and potential stability compared to the unmodified electrode. It was successfully applied for copper determination in real water samples.

scholarly journals Fluoride Variations in Rivers on the Slopes of Mount Meru in Tanzania

2018 ◽  
Vol 2018 ◽  
pp. 1-18 ◽  
Author(s):  
Aldo J. Kitalika ◽  
Revocatus L. Machunda ◽  
Hans C. Komakech ◽  
Karoli N. Njau
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Laboratory Experiments ◽  
Fluoride Concentration ◽  
Ion Selective Electrode ◽  
World Health ◽  
Wet Season ◽  
Selective Electrode ◽  
Fluoride Ions ◽  
The World

This study reports the variations of fluoride ions in rivers on the slopes of Mount Meru in the northern part of Tanzania. More than 318 water samples were collected from Temi, Nduruma, Tengeru, and Maji ya Chai Rivers in both wet (mid-March and April) and dry (August) seasons. The samples were analyzed for fluoride levels using Ion Selective Electrode (ISE). The minimum and maximum average fluoride levels in the wet season were 0.24±0.03 mg/l and 65.20±0.03 mg/l, respectively, whereas the average lowest and highest levels in the dry season were 1.02±0.02 mg/l and 69.01±0.03 mg/l, respectively. Tengeru River had the lowest fluoride levels in both seasons, whereas Maji ya Chai recorded the highest fluoride levels in both seasons. The headwater of all rivers with the exception of Maji ya Chai met the World Health Organization’s (WHO) maximum acceptable fluoride levels of 1.50 mg/l and the downstream environment qualified for Tanzania Bureau of Standards (TBS) maximum permissible fluoride concentration in drinking water of 4.00 mg/l. Also, the laboratory experiments showed that fluoride containing rocks exposed to pH above 7.6 display high leaching of F− in solution which gradually increased with the increase in pH, indicating that dissolution of fluoride in water is a function of pH.

Analysis for Chloride Ion in High Purity Water and Heavy Water of Pressurized Reactors and Cooling Systems by Ion Selective Electrode

1977 ◽  
Vol 60 (3) ◽  
pp. 625-627
Author(s):  
Ivan Sekerka ◽  
Josef F Lechner ◽  
Les Harrison
Keyword(s):  
Heavy Water ◽  
High Purity ◽  
Water Samples ◽  
Chloride Ion ◽  
Ion Selective Electrode ◽  
Steam Generators ◽  
Selective Electrode ◽  
Cooling Systems ◽  
Reliable Determination ◽  
Standard Solutions

Abstract A rapid, simple, sensitive, and reliable determination of parts per billion (ppb) levels of chloride ion is described for high purity water or heavy water of pressurized and high temperature reactors, steam generators, and cooling systems by mercurous chloride-mercuric sulfide ion selective electrode. The method has been applied to heavy water samples of CANDU-type nuclear reactors as well as to the water of conventional steam generators. The manual method consists of treating 100 ml aliquots of standard solutions and water samples with 1 ml 2M HNO3. A calibration curve is constructed from the millivolt readings obtained in the standard solutions, and chloride ion concentration of the samples is determined by comparing the mv reading of the sample with the calibration graph. The automated and computerized version provides all operations automatically, together with a direct printout of the concentration and indexing. The electrode displays near-Nernstian response for the range 0.05–3.500 ppm chloride and can be used for concentrations as low as 0.02 ppm. Comparative tests and coefficients of variation are highly satisfactory.

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