Authors :
R. Saran; N.K. Baishaya
Volume/Issue :
Volume 6 - 2021, Issue 4 - April
Google Scholar :
http://bitly.ws/9nMw
Scribd :
https://bit.ly/3o4donv
Abstract :
A novel micellar sensitized
spectrophotometric method has been developed in the
present work for the determination of nickel in varying
geological matrices such as aluminum alloys, stainless
steel, manganese nodule and others. The method utilizes
the reaction of 5- (2’– carboxyphenyl) azoxine with
nickel in aqueous medium at pH 5.2-6.1 to form a winered colored complex. The reaction is sensitized by Triton
X-100, a non-ionic surfactant. Triton X-100, micellar
sensitization of the reaction results in five times
enhanced molar absorptivity enabling the determination
of an amount as low as 1 ppm of nickel in rock samples
within a relative standard deviation of ±1.2% and
enhanced stability of the complex from 4 hours to at least
40 hours. Extraction of the complex is avoided making
the procedure simple, rapid and easy in operation. The
molar absorptivity and Sandell’s sensitivity of the
complex are 1.15.105
1.mol-1
.cm-1
and 0.51 ng.cm-2
at λmax
557nm, respectively. The limit of determination 5 ppb in
solution is far better than the detection limit by ICPOES (10 ppb) at the most favored nickel line 231.60 nm.
The method was applied to the determination of nickel in
aluminum alloys, stainless steel, manganese nodule and
other geological materials.
Keywords :
Spectrophotometry, nickel, triton X-100, 5- (2’ – carboxyphenyl) azoxine, micellar sensitization, aluminum alloys, stainless steel, manganese nodule, geological samples, ICP-OES, determination limit.
A novel micellar sensitized
spectrophotometric method has been developed in the
present work for the determination of nickel in varying
geological matrices such as aluminum alloys, stainless
steel, manganese nodule and others. The method utilizes
the reaction of 5- (2’– carboxyphenyl) azoxine with
nickel in aqueous medium at pH 5.2-6.1 to form a winered colored complex. The reaction is sensitized by Triton
X-100, a non-ionic surfactant. Triton X-100, micellar
sensitization of the reaction results in five times
enhanced molar absorptivity enabling the determination
of an amount as low as 1 ppm of nickel in rock samples
within a relative standard deviation of ±1.2% and
enhanced stability of the complex from 4 hours to at least
40 hours. Extraction of the complex is avoided making
the procedure simple, rapid and easy in operation. The
molar absorptivity and Sandell’s sensitivity of the
complex are 1.15.105
1.mol-1
.cm-1
and 0.51 ng.cm-2
at λmax
557nm, respectively. The limit of determination 5 ppb in
solution is far better than the detection limit by ICPOES (10 ppb) at the most favored nickel line 231.60 nm.
The method was applied to the determination of nickel in
aluminum alloys, stainless steel, manganese nodule and
other geological materials.
Keywords :
Spectrophotometry, nickel, triton X-100, 5- (2’ – carboxyphenyl) azoxine, micellar sensitization, aluminum alloys, stainless steel, manganese nodule, geological samples, ICP-OES, determination limit.
