Nk. Murthy et al., PHOTOMETRIC-DETERMINATION OF DISSOLVED-OXYGEN WITH IRON(II) CACOTHELINE OXALATE BLUE, Fresenius' journal of analytical chemistry, 351(6), 1995, pp. 586-587
Iron (II)-cacotheline-oxalate blue solution is used as reductometric r
eagent for the estimation of dissolved oxygen. By titrating the blue c
omplex solution photometrically, the dis-solved oxygen in water sample
s can be accurately determined in the range of 2 to 8 mg/l. The stoich
iometry of the reaction between dissolved oxygen and the blue complex
was found to be 1 : 0.8 or 5 : 4. The applicability of this method to
distilled water, river water and reservoir water was tested. The Winkl
er's method [1] and its various modifications and adaptations, widely
used for the determination of dissolved oxygen, are laborious and time
consuming. Therefore a new method using iron (II)-cacotheline-oxalate
(ICO) blue solution was developed for this purpose.