Study of Dissolved Iron in Some ground Water Samples of Rajnandgaon Region of Madhya Pradesh Using N-Hydroxyamidine and Thiocyanate

Abstract

Ground water delivered by some bore wells of Rajnandgaon area
are slightly turbid, having slow sedimentation causing reddish
precipitate. Ten such spots were selected for the collection of ground
water samples through borewells. These water samples have been
characterised in terms of pH, total dissolved solid, total hardnesss
and iron concentration. A new method has been developed for determination
of iron(III) using N-hydroxy-N-o-chlorophenyl-N'-(3-
methyl) phenyl p-toluimidine hydrochloride in presence of
thiocyanate. The orange-red complex is easily extractable in benzene
and suitable for spectrophotometric determination. The
coloured system obeys Beer's law in the range.  0.4-0.4 ppm. The
ternary complex shows maximum absorbance at 460 nm having its
molar absorptivity to be 12000 ± 50 1 mole^-1. The method is free
from interference of many common ions. The pH values of the
selected samples are within permissible limit (6.8-8.3). TDS is in
the range 130-900 ppm and total hardness 330-1130 ppm. The iron
content was found to be in the range 0.1-3.0 ppm.