A New Spectrophotometric Method for Hydrogen Sulphide Through Electrolytically Generated Mn(III) With O-Tolidine
A simple, sensitive and economical spectrophotometric method for the determination of hydrogen sulphide is developed. The method is based on a redox reaction in that Mn(III) generated electrolytically is taken in excess, which is oxidizing a known but a less quantity of hydrogen sulphide and the unr...
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| Language: | English |
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Wiley
2008-01-01
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| Series: | E-Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2008/730258 |
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| author | M. S. Suresha Mansour S. Abdul Galil Mahadevaiah M. A. Sathish M. S. Yogendra Kumar G. Nagendrappa |
| author_facet | M. S. Suresha Mansour S. Abdul Galil Mahadevaiah M. A. Sathish M. S. Yogendra Kumar G. Nagendrappa |
| author_sort | M. S. Suresha |
| collection | DOAJ |
| description | A simple, sensitive and economical spectrophotometric method for the determination of hydrogen sulphide is developed. The method is based on a redox reaction in that Mn(III) generated electrolytically is taken in excess, which is oxidizing a known but a less quantity of hydrogen sulphide and the unreacted oxidant will oxidize further o-tolidine to produce an orange yellow quinonediimine absorbing cation (λ max. 455 nm). Therefore, in principle, the decrease in color intensity of the absorbing system is proportional to the concentration of hydrogen sulphide. The stoichiometry between Mn(III) and o-tolidine and stability constant of the complex were determined by Job's continuous method, the corresponding values were found to be 2:1 and 1.42X105 Lmol-1. The system was obeying Lambert-Beer's law in the range 0.2-1.4 μg mL-1 of hydrogen sulphide. Molar absorptivity, correlation coefficient and Sandell's sensitivity values were also calculated and found to be 4.2062X103 L mol-1 cm-1, 0.999 and 0.0012 μg cm-2 respectively. The method was employed for the determination of hydrogen sulphide in water samples. The results obtained were reproducible with acceptable standard deviation 0.01-0.068 and relative standard deviation, less than 3.21%. For a comparison, hydrogen sulphide present in water samples were also determined separately following the methylene blue official method. The results of the proposed method compare well with the official method. |
| format | Article |
| id | doaj-art-da9815d037dd4c8ca9a4b1ad6836c2c5 |
| institution | Kabale University |
| issn | 0973-4945 2090-9810 |
| language | English |
| publishDate | 2008-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | E-Journal of Chemistry |
| spelling | doaj-art-da9815d037dd4c8ca9a4b1ad6836c2c52025-02-03T01:10:12ZengWileyE-Journal of Chemistry0973-49452090-98102008-01-0151939910.1155/2008/730258A New Spectrophotometric Method for Hydrogen Sulphide Through Electrolytically Generated Mn(III) With O-TolidineM. S. Suresha0Mansour S. Abdul Galil1Mahadevaiah2M. A. Sathish3M. S. Yogendra Kumar4G. Nagendrappa5Department of Studies in Chemistry, University of Mysore, Mysore 570006, IndiaDepartment of Studies in Chemistry, University of Mysore, Mysore 570006, IndiaDepartment of Studies in Chemistry, University of Mysore, Mysore 570006, IndiaDepartment of Studies in Chemistry, University of Mysore, Mysore 570006, IndiaDepartment of Studies in Chemistry, University of Mysore, Mysore 570006, IndiaDepartment of Studies in Chemistry, University of Mysore, Mysore 570006, IndiaA simple, sensitive and economical spectrophotometric method for the determination of hydrogen sulphide is developed. The method is based on a redox reaction in that Mn(III) generated electrolytically is taken in excess, which is oxidizing a known but a less quantity of hydrogen sulphide and the unreacted oxidant will oxidize further o-tolidine to produce an orange yellow quinonediimine absorbing cation (λ max. 455 nm). Therefore, in principle, the decrease in color intensity of the absorbing system is proportional to the concentration of hydrogen sulphide. The stoichiometry between Mn(III) and o-tolidine and stability constant of the complex were determined by Job's continuous method, the corresponding values were found to be 2:1 and 1.42X105 Lmol-1. The system was obeying Lambert-Beer's law in the range 0.2-1.4 μg mL-1 of hydrogen sulphide. Molar absorptivity, correlation coefficient and Sandell's sensitivity values were also calculated and found to be 4.2062X103 L mol-1 cm-1, 0.999 and 0.0012 μg cm-2 respectively. The method was employed for the determination of hydrogen sulphide in water samples. The results obtained were reproducible with acceptable standard deviation 0.01-0.068 and relative standard deviation, less than 3.21%. For a comparison, hydrogen sulphide present in water samples were also determined separately following the methylene blue official method. The results of the proposed method compare well with the official method.http://dx.doi.org/10.1155/2008/730258 |
| spellingShingle | M. S. Suresha Mansour S. Abdul Galil Mahadevaiah M. A. Sathish M. S. Yogendra Kumar G. Nagendrappa A New Spectrophotometric Method for Hydrogen Sulphide Through Electrolytically Generated Mn(III) With O-Tolidine E-Journal of Chemistry |
| title | A New Spectrophotometric Method for Hydrogen Sulphide Through Electrolytically Generated Mn(III) With O-Tolidine |
| title_full | A New Spectrophotometric Method for Hydrogen Sulphide Through Electrolytically Generated Mn(III) With O-Tolidine |
| title_fullStr | A New Spectrophotometric Method for Hydrogen Sulphide Through Electrolytically Generated Mn(III) With O-Tolidine |
| title_full_unstemmed | A New Spectrophotometric Method for Hydrogen Sulphide Through Electrolytically Generated Mn(III) With O-Tolidine |
| title_short | A New Spectrophotometric Method for Hydrogen Sulphide Through Electrolytically Generated Mn(III) With O-Tolidine |
| title_sort | new spectrophotometric method for hydrogen sulphide through electrolytically generated mn iii with o tolidine |
| url | http://dx.doi.org/10.1155/2008/730258 |
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