Chemistry Reference
In-Depth Information
15.1.8
Phosphate
15.1.8.1
Complexation-solvent extraction preconcentration
Most spectrophotometric methods of phosphates are based on the formation of heterpoly
acid with molybdate. The heteropoly acid formed
Table 15.1
Preconcentration of anionic metal species from non saline water
Metal
Type
of
water
Resin
Medium
Eluting
agent
Detection
limit
Analytical finish
R
AI
Potable Anion exchange
Pyro
catechol
violet
-
-
-
[2
HNO
3
Cd
Non
saline
Dowex 1-X8
HCl or
HBrO
-
Spectrophotometric [2
CH
3
COOH
-
Cd
Non
saline
Amberlite IRA-400 Cyanide
Spectrophotometric [2
2mol L
−1
HNO3
Cd
Non
saline
Biorad 140-1242
A91-X2
8-hydroxy
quinoline
5-sulphonic
acid
<0.2µg
L
−1
AAS
[1
0.1mol L
−1
HCl
Cd
Sea
water
Anion exchange
1 mol L
−1
thiocyanate
2mol L−1
HNO3
-
AAS
[3
Cd
Sea
water
Polyacrylamidoxime
Resin
-
1:1
HClH
2
O
-
AAS
[3
MeOH:HBr aq HNO
3
Cd
Non
saline
and
potable
Dowex 1-X8
AAS
[3
Cd
Sea
water
Single bead anion
exchange
-
-
-
Mass
spectroscopy
[3
12mol L−
1
<0.2µg
L−1
Co
Non
saline
Biorad 140-
quinoline
1242, A91-X2
8-hydroxy
HCl
5-sulphonic
acid
AAS
[1
Co
Non
saline
Dowex A91-X8
HCl-
thiocyanate
HCl
-
Spectrophotometric [3
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