Chemistry Reference
In-Depth Information
2.101.3
Anodic stripping voltammetry
Differential pulse anodic stripping voltammetry has been used [869] to detect
thiosulphate, a potential substrate for sulphuric acid forming thiobacilli. The method was
selective for thiosulphate in the presence of hydrogen sulphide, sulphite, polysulphide
and elemental sulphur. Reproducible results were obtained for thiosulphate
concentrations of 3-5mg L
−1
.
2.101.4
Ion chromatography
The application of this technique is discussed under multianion analysis in section 12.2.5.
2.101.5
High performance liquid chromatography
The application of this technique is discussed under multianion analysis in section
13.1.1.3.
2.101.6
Micelle chromatography
The application of this technique is discussed under multianion analysis in section
13.5.1.3.
2.101.7
Preconcentration
The application of preconcentration is discussed in section 15.1.12.
2.102
Titanate
2.102.1
Spectrophotometric methods
Titanates have been determined spectrophotometrically in water extracts by a method
based on reaction with N-p-methoxyphenyl-2 furo-hydroxamic acid which forms a
golden yellow colour with an absorption maximum at 385nm with titanium(V). In this
method [870] the titanate is reduced to titanium(III) with stannous chloride and then
extracted with
N-p
-methoxy-phenyl-1-2-furohydroxamic acid in chloroform. The
chloroform extract was then evaluated spectrophotometrically. Beer's law is obeyed over
the range 0.5-10mg L
−1
titanate and 1.7mg L
−1
of titanium could be detected.
The following ions did not interfere when present at 50 times the concentration of
titanate: Cu
2+
, Co
2+
, Zn
2+
, Hg
2+
, Ag
+
, Cd
2+
, UO
2
2+
, V
4+
, Fe
2+
, Fe
3+
, Al
3+
, La
3+
, Sc
3
+,
Ga
3+
, Th
4+
, halides, acetate, carbonate, nitrate, oxalate.
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