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H
2
PO
4
−
3.6
Mg
2+
9.0
NO
2
-
3.8
NO
3
5.0
SO
4
<
2
14.2
Source: Reproduced with permission from the American Chemical Society [2]
Apparatus
Ion chromatographic system consisting of a Toyo Soda Model HLC-6DL ion
chromatograph [62]. A Toyo Soda Model CM-8 conductivity detector with a range of
5µs cm
−1
. The sample loop volume was 0.1ml and a flow rate of 1.0ml min
−1
was
employed. The separation column, 4.6mm id 50mm long, made of Teflon, was packed
with porous silica based anion exchanger of TSK gel 1C-Anion SW (Toyo Soda, particle
size 5±1 µm capacity 0.1mequiv g
−1
. The column and the conductivity detector was
maintained at 27±1°C.
EDTA eluent (1mi mol L
−1
) was prepared by dissolving ethylene diaminetetraacetic
acid disodium salt in deionised water and adjusting to pH 6.0 with 0.1mol L
−1
sodium
hydroxide.
T
able 12.20 shows the retention times of chloride, phosphate (H
2
PO), nitrite, nitrate,
sulphate, calcium and magnesium. All of these ions were eluted within 15min. The
calibration curves of these ions by peak height measurements were linear up to the
concentration of 20mg L
−1
. The detection limits defined as the concentration
corresponding to twice the
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