Chemistry Reference
In-Depth Information
extract anions. Soils are leached with water and Dowex 50-X4 resin added to the aqueous
extract which is then passed through a Sep-Pak C
18
cartridge and the eluate then passed
through the ion chromatographic column. The best separation of these ions was obtained
using a 5×10
−4
mol L
−1
potassium hydrogen phthalate solution in 2% methanol at pH 4.9.
A reverse phase system was employed. Retention times were 5.5, 7.9, 12.6 and 18min for
Table 12.9
Ion chromatography of anions
Anions
Eluent
Column
Type of sample
Detector
Ref.
AsO
4
3−
/SO
3
2
-
-
Environmental
waters
-
[36]
PO
4
3−
-
-
Sea
-
[37]
CN
1−
, S
1−
,
OCl
1−
-
-
Ground waters
-
[38]
SO
3
2−
/S
2
O
3
2-
4.8mmol L
−1
NaHCO
3
then
6.9mmol L
−1
elution NaHCO
3
−
/0.86mmol L
−1
Na
2
CO
3
Gradient
Not stated
-
[14]
NO
3
1−
/SO
4
2−
-
-
Non saline
-
[39]
F
1−
/o
−
PO
4
3−
/Br
1−
-
-
River
-
[17]
Cl
1−
/NO
3
1−
/SO
4
2−
-
-
Pure waters
-
[40]
CO
3
2−
/HCO
3
1−
-
Zipax Sax and
Westcan
-
Electrical
conductivity and uv
[41]
SiO
3
2−
(22µg
L
−1
)
-
-
Non saline
-
[42]
SO
4
2−
(50p
mole)
5-sulpho-
isophthalic acid
Nucleosil SB
anion
exchange
Freshwater
sediment Pure
water
Radio ion
chromatography
[43]
Misc, anions
-
resin
Non saline
conductiometric
[3]
NO
2
1−
/NO
3
1−
-
Polystyrene
Non saline
divinyl benzene
copolymer
-
[44]
NO
2
1−,
Br
1−,
NO
3
1−
, SO
4
2−
, I
1−
SCN
1−
-
Na
naphthalene
trisulphonate
Non saline
Spectrophotometric [45]
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