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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.12 [2005] >
IJCT Vol.12(5) [September 2005] >
| Title: | Spectrophotometric determination of dissolved oxygen in water |
| Authors: | Narayana, B
Mathew, Mendalin
Cherian, Tom
Pasha, Chand |
| Keywords: | Dissolved oxygen determination
spectrophotometry
azure B |
| Issue Date: | Sep-2005 |
| Publisher: | CSIR |
| IPC Code: | G01J3/00 |
| Abstract: | A
simple, rapid and sensitive spectrophotometric method has been developed for
the determination of dissolved oxygen (DO) in river water samples. The method
is based on the reaction of dissolved oxygen with manganous sulphate in
alkaline iodide-azide solution and the liberation of iodine by manganese
dioxide. The liberated iodine bleaches the violet colour of azure B which is
measured at 644 nm. The decrease in absorbance is directly proportional to
dissolved oxygen concentration and obeys Beer’s law in the range 0.2-1.4  gmL-1. The molar
absorptivity, Sandell’s sensitivity, detection limit and quantitation limit of
the method were found to be 5.86  104 Lmol-1 cm-1, 3.66 10-3 g/cm2, 0.030 and 0.090
gmL-1,
respectively |
| Page(s): | 593-595 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.12(5) [September 2005]
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