1170 J. Chin. Chem. Soc., Vol. 52, No. 6, 2005
Liu et al.
Table 5. Analytical results of cadmium determination in natural waters by the proposed
method (mg·L-1)
Sample
Known value
Found
R.S.D (%)
Recovery (%)
Mineral water
0.50
1.00
0.50
1.00
0.50
1.00
0.49 ± 0.01
0.99 ± 0.02
0.51 ± 0.01
1.01 ± 0.01
0.53 ± 0.03
1.04 ± 0.02
1.85
2.16
3.11
1.58
2.63
1.75
098
099
102
101
106
104
Tap water
River water
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Determination of cadmium in mineral, tap and river
water
The proposed method was applied to the analysis of
mineral water, tap water and river water samples. Natural wa-
ter samples were filtered through 0.45 mm membrane filters.
1 mL sample solution was placed into a calibrated tube con-
taining 0.6 mL b-CDP-DHPH (1 ´ 10-4 mol/L), 2.0 mL am-
monia-ammonium acetate buffer solution (pH = 10.0) and 3.0
mL of dimethylformamide. The final volume was made up to
10.0 mL with secondary distilled water. The solution was
mixed and equilibrated at room temperature for 20 min. The
relative fluorescence intensity of the b-CDP-DHPH-Cd2+
complex was measured within 0.33-4 h at an emission wave-
length of 442.0 nm in a 1 cm quartz cell, keeping the excita-
tion wavelength maximum at 368.0 nm. The results are pre-
sented in Table 5. The obtained recovery varied from 98 to
106% showing that the method was very good in determina-
tion of cadmium in mineral water, tap water and river water.
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Received March 1, 2005.
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