Stable, Sensitive Linear Starch Indicator Solution for Iodimetry

1953 ◽  
Vol 25 (6) ◽  
pp. 984-985 ◽  
Author(s):  
J. L. Lambert
Keyword(s):  
Indicator Solution

scholarly journals SELECTIVE MERCURIMETRIC TITRATION ASSAY OF CHLORIDE CONCENTRATION IN THE WATER OF GREEN COCONUTS USING NOVEL INDICATOR SYSTEM

2017 ◽  
Vol 9 (3) ◽  
pp. 268
Author(s):  
Shivaji Rangnath Labhade
Keyword(s):  
Statistical Treatment ◽  
Chloride Concentration ◽  
Potassium Thiocyanate ◽  
Indicator System ◽  
Coconut Water ◽  
Stoichiometric Ratio ◽  
Indicator Solution ◽  
End Point ◽  
Red Color

Objective: A selective mercurimetric titration procedure is proposed for the assay of chloride concentration in the water of green coconut using mercury(II) nitrate [(Hg(NO3)2] reagent and iron(III) nitrate [Fe(NO3)3] with synthetically prepared mercury(II) thiocyanate [Hg(SCN)2] indicator system.Methods: An indicator solution was prepared by titrating Hg(NO3)2 against potassium thiocyanate (KSCN) till a red color end point using Fe(NO3)3. Then a known amount of Hg(NO3)2 was added to indicator solution and titrated against the water of green coconut till the original red color reappeared.Results: The concentration of chloride present in the volume of coconut water utilized in between these two end points was found to be reacting in the 2:1 stoichiometric ratio with the Hg(NO3)2 taken in the second step of the titration. The statistical treatment of the experimental data obtained by using standard solutions of sodium chloride (NaCl) indicates that the procedure is precise and accurate. The phosphate, sulfate, organic compounds and inorganic minerals present in the coconut water did not interfere with the measurement of chloride by this procedure. Both the cationic mineral value (was also determined by complexometric titration) and chloride concentration in the coconut water were found to be decreased with the development of the coconuts.Conclusion: The proposed procedure of determination of chloride concentration in the water of green coconut is simple, reliable and inexpensive. This procedure is excellent for determination of chloride in the acidic solution without precise adjustment of the pH for detection of the end point. Owing to the homogenous reaction condition no titration errors those are commonly encountered by co-precipitation in the argentometric assay of chloride. 

Cobalt not detected in contemporary US consumer paint colorants by cobalt indicator solution or X-ray fluorescence spectroscopy

2018 ◽  
Vol 78 (5) ◽  
pp. 355-356 ◽  
Author(s):  
Dathan Hamann ◽  
Carsten R. Hamann ◽  
Patrick Kishi ◽  
Torkil Menné ◽  
Jacob P. Thyssen
Keyword(s):  
Fluorescence Spectroscopy ◽  
Indicator Solution ◽  
X Ray

The rainbow reaction: pH and universal indicator solution

1993 ◽  
Vol 70 (5) ◽  
pp. 406
Author(s):  
Howard Moore ◽  
Elizabeth B. Moore
Keyword(s):  
Indicator Solution ◽  
Universal Indicator

scholarly journals High-sensitive colour indicator of absorbed dose of epithermal neutrons radiation

2022 ◽  
Vol 2155 (1) ◽  
pp. 012032
Author(s):  
G A Kulabdullaev ◽  
A A Kim ◽  
G T Djuraeva ◽  
A F Nebesniy ◽  
G A Abdullaeva ◽  
...  
Keyword(s):  
Absorbed Dose ◽  
High Sensitivity ◽  
Neutron Radiation ◽  
Arsenazo Iii ◽  
Indicator Solution ◽  
Tissue Equivalent ◽  
Epithermal Neutrons ◽  
Delayed Measurement ◽  
Artificial Illumination ◽  
Error Of Measurement

Abstract In our study, the high-sensitivity colour indicator of the absorbed dose of radiation of epithermal neutrons with energy 0 to 10 keV for dosimetry of low-energy neutrons was developed. We had been developed an indicator on the basis of the dye solution of arsenazo III and gadopentetic acid, allowing precisely define of absorbed dose in the range 2 to 103 Gy. The properties of arsenazo III as metallic indicator, which changes colour after binding of free ions of metals, were used. Colour of the indicator solution before irradiation and after it is stable enough in time at storage in the dark, at artificial illumination or at scattered sunlight. The developed indicator, consisting of a solution of arsenazo III and gadopentetic acid, allows estimating the absorbed dose of epithermal neutron irradiation with good accuracy and reduces the error of measurement related to changing colour of dye under the influence of other factors (light, temperature etc.) Dosimeter is tissue-equivalent and possesses a high-sensitivity neutron radiation due to the content of gadolinium in solution, which has great neutron capture cross-section. The developed dosimeter persists spectrophotometric characteristics after irradiaion within few weeks that allows to use it for measurement of the absorbed dose, both in real time mode and with the delayed measurement within few weeks.

scholarly journals Determination of Ammonium Concentration in Post-Process Waters from Underground Coal Gasification

2016 ◽  
Vol 21 (1-2) ◽  
pp. 107-116
Author(s):  
Malwina Cykowska ◽  
Małgorzata Bebek ◽  
Aleksandra Strugała-Wilczek
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Coal Gasification ◽  
Ammonium Concentration ◽  
Hard Coal ◽  
Underground Coal Gasification ◽  
Permeable Membrane ◽  
Indicator Solution ◽  
Validation Parameters

AbstractA flow injection analysis method for spectrophotometric determination of ammonium in waters produced during underground coal gasification (UCG) of lignite and hard coal was described. The analysis of UCG water samples is very difficult because of their very complicated matrix and colour. Due to a huge content of organic and inorganic substances and intensive colour of samples (sometimes yellow, quite often dark brown or even black), most analytical methods are not suitable for practical application. Flow injection analysis (FIA) is based on diffusion of ammonia through a hydrophobic gas permeable membrane from an alkaline solution stream into an acid-base indicator solution stream. Diffused ammonia causes a colour change of indicator solution, and ammonia is subsequently quantified spectrophotometrically at 590 nm wavelength. The reliability of the results provided by applied method was evaluated by checking validation parameters like accuracy and precision. Accuracy was evaluated by recovery studies using multiple standard addition method. Precision as repeatability was expressed as a coefficient of variation (CV).

scholarly journals Note. A starch indicator solution

The Analyst ◽  
1922 ◽  
Vol 47 (553) ◽  
pp. 166
Author(s):  
William J. Painter
Keyword(s):  
Indicator Solution

scholarly journals Improved Diffusion Methods for Nitrogen and 15Nitrogen Analysis of Kjeldahl Digests

2000 ◽  
Vol 83 (5) ◽  
pp. 1039-1046 ◽  
Author(s):  
W Bart Stevens ◽  
Richard L Mulvaney ◽  
Saeed A Khan ◽  
Robert G Hoeft
Keyword(s):  
Ambient Temperature ◽  
Isotope Ratio ◽  
Steam Distillation ◽  
Soil Samples ◽  
Chemical Plant ◽  
Deionized Water ◽  
Indicator Solution ◽  
Shell Vial ◽  
Improve Reliability

Abstract Simple methods are described that permit the use of either H3BO3 indicator solution or acidified filter disks to collect NH3 liberated by treatment of Kjeldahl digests with NaOH. These methods incorporate modifications to improve reliability, analytical capacity, and convenience. A semimicro digest was diluted to 25 mL with deionized water, and a 10 mL aliquot, containing up to 4 mg N (150 μg N for diffusions into acidified disks), was transferred to a shell vial, which was placed inside a 473 mL (1 pint) Mason jar containing 10 mL 10N NaOH. The NH3 liberated by overturning the vial was collected after 12 to 48 h at ambient temperature, or after 4 h at 45 to 50°C on a hotplate, for quantitative and/or isotope-ratio analyses. With either H3BO3 indicator solution or acidified filter disks, recovery of diffused N was quantitative. Isotope-ratio analyses of diffused N from 15N-labeled chemical, plant, and soil samples were within 3% of analyses using steam distillation.

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