Determination of S-hydroxyquinoline-5-sulphonic acid

1958 ◽  
Vol 23 (9) ◽  
pp. 1803-1805
Author(s):  
V. Velich
Keyword(s):  
Sulphonic Acid

scholarly journals Spectrophotometric Determination of Toxic Elements (Cadmium) in Aqueous Media

2011 ◽  
pp. 1-12 ◽  
Author(s):  
MR Ullah ◽  
M Enamul Haque
Keyword(s):  
Sodium Salt ◽  
Biological Samples ◽  
Chemical Engineering ◽  
Sulphonic Acid ◽  
Alizarin Red S ◽  
Standard Reference Materials ◽  
Complexing Agents ◽  
Alizarin Red ◽  
Acid Sodium Salt

Trace amount of toxic element (Cadmium) was determined by spectrophotometer method using 1, 2-dihydroxy anthraquinone-3-sulphonic acid, sodium salt. (Alizarin red S) as a new spectrophotometer reagent. Alizarin red S reacts in slightly acidic solution (0.005 - 0.05M H2SO4) with cadmium to give a deep greenish yellow chelate which has an absorption maximum at 422 nm. The reaction is instantaneous and absorbance remains stable for over 24hrs. The average molar absorption co-efficient and sandell's sensitivity were found to be 2.24 103L mol-1 cm-1 and 20 ng cm 2 of Cd respectively. Linear calibration graphs were obtained for 0.1 - 40μg mL-1 of Cd. The stoichiometric composition of the chelate is 1 : 2 (Cd : Alizarin red S). Large excess of over 50 cations, anions, and some common complexing agents (e.g EDTA, oxalate, citrate phosphate, thio-urea, SCN-) do not interfere in the determination. The method was successfully used in the determination of cadmium in Several Standard Reference Materials (alloys, steels and water) as well as in some environmental waters (In land and surface), biological samples (human blood and urine), soil samples and complex synthetic mixtures. The method has high precision and accuracy. (S = ±0.01 for 0.5 μg mL-1. Keywords spectrophotometry; cadmium determination; 1, 2-dihydroxy anthraquinone-3-sulphonic acid; sodium salt (Alizarin red S); alloy; steel; environmental; biological; samples; soil samplesDOI: 10.3329/jce.v25i0.7233Journal of Chemical Engineering, IEB Vol. ChE. 25, No. 1, December 2010 pp.1-12

Analysis of mixtures of 4-nitrotoluene-2-sulphonic acid and 4,4'-dinitrostilbene-2,2'-disulphonic acid by tast polarography, differential pulse polarography and thin layer chromatography

1985 ◽  
Vol 50 (8) ◽  
pp. 1673-1684
Author(s):  
Jiří Barek ◽  
Ivo Daňhel
Keyword(s):  
Thin Layer ◽  
Differential Pulse ◽  
Sulphonic Acid ◽  
Polarographic Determination ◽  
Differential Pulse Polarography ◽  
Pulse Polarography ◽  
Tetramethylammonium Bromide ◽  
Disulphonic Acid ◽  
Layer Chromatography

Conditions are sought for the determination of 4-nitrotoluene-2-sulphonic acid (I) and 4,4'-dinitrostilbene-2,2'-disulphonic acid (II) by TAST polarography within the concentration range of 10-2 - 10-6 mol l-1 and by differential pulse polarography (DPP) within the concentration range of 10-3 - 10-8 mol l-1. DPP is applied to the determination of these substances after the thin layer chromatographic separation of their mixtures. Methods are also worked out for their analysis without prior separation, based either on the combined DPP determination of I and the TAST polarographic determination of the sum of I and II in sulphuric acid solutions, or on the DPP determination of the C=C bond in II and the TAST polarographic determination of the sum of the two substances in tetramethylammonium bromide solutions.

1,2-Naphthoquinone-4-Sulphonic Acid Sodium Salt (NQS) as an Analytical Reagent for the Determination of Pharmaceutical Amine by Spectrophotometry

2012 ◽  
Vol 47 (3) ◽  
pp. 219-232 ◽  
Author(s):  
Abdalla Ahmed Elbashir ◽  
Abir Abdalla Ahmed ◽  
Shazalia M. Ali Ahmed ◽  
Hassan Y. Aboul-Enein
Keyword(s):  
Sodium Salt ◽  
Sulphonic Acid ◽  
Acid Sodium Salt ◽  
Analytical Reagent
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