TY - JOUR
T1 - Simultaneous determination of lead and cadmium by stripping voltammetry using in-situ mercury film glassy carbon electrode coated with nafion-macrocyclic ester
AU - Lara, Jesid
AU - Torres, Juan F.
AU - Beltrán, Olimpo García
AU - Nagles, Edgar
AU - Hurtado, John
PY - 2017/8/1
Y1 - 2017/8/1
N2 -
This work report a sensitive and selective anodic stripping method for the simultaneous determination of Pb(II) and Cd(II) using (3,10,18,25-tetraoxapentacyclo [25.3.1.1
12,16
.0
4,9
.0
19,24
] dotriaconta1(31),4(9),5,7,12(32),13,15,19,21,23,27,29-dodecaene-2,11,17,26-tetrone) macrocyclic ester (L). Anodic peak currents were increased from 1.16 to 31.48 μA for Pb(II) and 0.22 to 6.68 μA for Cd(II) when the in-situ mercury film electrode was modified with nafion and (L). Moreover, potentials separation values for Cd-Pb shift from 150 to 190 mV. Optimal parameters such as: pH; L concentration (C
L
), mercury concentration (C
Hg
), accumulation potential (E
ACC
) and accumulation time (t
ACC
) were pH 4.0 for Pb(II) and 5.0 for Cd(II) using phosphate buffer solution (PBS), CL 12.0 mmol L
-1
, C
Hg
28.0 mg L
-1
, E
ACC
-1
.0 V and tACC 60. Detection limits (DoL) were 0.085 and 0.80 μg L
-1
for Pb(II) and Cd(II) respectively. The relative standard deviation (RSD) for seven measurements of Pb(II) and Cd(II) 9.0 μg L
-1
were of 2.5 and 2.0% respectively. The method was validated by ICP multi-element standard solution IX (Merck) containing As, Be, Cd, Cr(VI), Hg, Ni, Pb, Se and Tl 100 mg L
-1
. Finally, useful of the modified electrode was developed in the analysis of Pb(II) and Cd(II) using tap water samples.
AB -
This work report a sensitive and selective anodic stripping method for the simultaneous determination of Pb(II) and Cd(II) using (3,10,18,25-tetraoxapentacyclo [25.3.1.1
12,16
.0
4,9
.0
19,24
] dotriaconta1(31),4(9),5,7,12(32),13,15,19,21,23,27,29-dodecaene-2,11,17,26-tetrone) macrocyclic ester (L). Anodic peak currents were increased from 1.16 to 31.48 μA for Pb(II) and 0.22 to 6.68 μA for Cd(II) when the in-situ mercury film electrode was modified with nafion and (L). Moreover, potentials separation values for Cd-Pb shift from 150 to 190 mV. Optimal parameters such as: pH; L concentration (C
L
), mercury concentration (C
Hg
), accumulation potential (E
ACC
) and accumulation time (t
ACC
) were pH 4.0 for Pb(II) and 5.0 for Cd(II) using phosphate buffer solution (PBS), CL 12.0 mmol L
-1
, C
Hg
28.0 mg L
-1
, E
ACC
-1
.0 V and tACC 60. Detection limits (DoL) were 0.085 and 0.80 μg L
-1
for Pb(II) and Cd(II) respectively. The relative standard deviation (RSD) for seven measurements of Pb(II) and Cd(II) 9.0 μg L
-1
were of 2.5 and 2.0% respectively. The method was validated by ICP multi-element standard solution IX (Merck) containing As, Be, Cd, Cr(VI), Hg, Ni, Pb, Se and Tl 100 mg L
-1
. Finally, useful of the modified electrode was developed in the analysis of Pb(II) and Cd(II) using tap water samples.
KW - Cadmium
KW - Lead
KW - Macrocyclic ester
KW - Modified electrode
KW - Stripping voltammetry
UR - http://www.scopus.com/inward/record.url?scp=85028464198&partnerID=8YFLogxK
U2 - 10.20964/2017.08.65
DO - 10.20964/2017.08.65
M3 - Artículo
AN - SCOPUS:85028464198
VL - 12
SP - 6920
EP - 6929
JO - International Journal of Electrochemical Science
JF - International Journal of Electrochemical Science
SN - 1452-3981
IS - 8
ER -