Chemistry Reference
In-Depth Information
TABLE 8.7 (continued)
Determination of Iron, Cobalt, and Nickel at Carbon Paste Electrodes and Sensors: Survey of Methods and Selected Studies
Type of CPE
(Modiier)
Technique
(Mode)
Measuring Principles
(Method Sequences)
Linearity Range
(LOD;
t
ACC
/
t
R
)
Ion, Species
Sample(s)
Other Speciication (Remarks)
Ref(s)
Ni
2+
C/PO.(DMG)
PSA.(chem..
ox.)
accum..by.chelating.with.
modif.;.redn..+.reoxidn..by.
O
2
.(diss..in.soln.)
0.01-3.mg.mL
−1
.
(8.ng.mL
−1
)
Model.solns.
DMG:.dimethylglyoxime
incl..study.on.chem..oxidn.
[684]
Ni
2+
,.Co
2+
C/SO.[+MF].
DMG,.
in situ
)
DPCSV
accum..by.chelating.with.
NN.or.DMG,.adsorption;.
cathodic.redn.
1.×.10
−8
−1.×.10
−6
.M.
Co.(5.×.10
−9
.M;.
10.min)
Sea.water.
(sampled.in.
100-1500.m.
depth)
s.e.:.AmB.+.TEA.(pH.9);.
analyses under.expedition.
conditions.at.ship
[812]
Ni
2+
,.Co
2+
C/PO.(
Cyclam
.
& ders.)
CSV
accum..by.ion-inclusion
MEx.+.cathodic.redn.
(4.×.10
−8
.M;.5.min)
Model.solns.
modif(s).:.azacrown.ether.compds.
s.e.:.(a).0.1.M.KCl,.b).0.1.M.KOH;.
test.on.simult..detn..of.Co
2+
[2312]
Ni
2+
C/PO.(DMG)
POT.(dir.)
compl..with.modif.
Equilibrium.potential
5.×.10
−7
−0.001.M
Steel.sample
High.stability.of.CMCPE;.spec..
dissolved.in.HNO
3
.and.buffered
[2313]
Ni
2+
C/Nj.(DCPAB)
POT.(dir.)
compl..with.modif.
Equilibrium.potential
3-6000.ppm
CRMs.(alloys)
modif.:.4-(3,5-dichloro-2-pyridyl-
1,3-diamino.benzene;.titr..with.
EDTA.in.6.M.HCl.or.2.M.NaOH
[2314]
Ni
2+
C/Nj.(
Dowex
50 W
)
AdSV
o.c..accum..by.ion-pairing
redn..+.reoxidn.
5-6000.μg.L
−1
.(1.μg.
L
−1
,.12.min)
Tap.and.mineral.
waters
s.e.:.0.005.M.HCl.(pH.3);.interfs..
from.Hg
II
.and.Ag
+
[1734]
Ni
2+
C/SO.+.MF.
(
DMG, in situ
)
DPCSV,.
CCSA
Ads..accum..by.chelating
redn..(cathodic.or.
I
CONST
)
(5.×.10
−7
.M;.60.s)
Crude.oil.
digested.
(as spiked.
sample)
Coupled.with.MWD;.high.acidity.
buffered.with.30%.NH
3
.(to.pH.9)
[627]
Ni
2+
C/PO.(DMG)
DPCSV,.
AD.(HA)
accum..via.chelating.+.
adsorption;.cathodic.redn.
5.×.10
−9
−5.×.10
−7
.M.
(3.×.10
−9
.M;.
25.min)
Commercial.
ethanol.fuel
DMG:.dimethyl.glyoxime;.modif..
added.in.paste;.compared.to.AAS
[1361]
Ni
2+
s-CPE/C/Wx.
(AMTS.+.
DMG,.
in situ
)
CV,.
DPCSV
accum..via.adsorption.(as.
Ni
II
-AMT)/MEx.+.DMG;.
deposition/cathodic.redn.
8.×.10
−9
−1.×.10
−6
.M.
(2.×.10
−9
.M;.
20.min)
Commercial.
ethanol.fuel
Solid-like.CPE.ctng..parafin.
wax (stable.in.EtOH);.AMTZ-S:.
amino-thiazole-functionalized.
silica
[1838]
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