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International Journal of Analytical Chemistry
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International Journal of Analytical Chemistry
/
2012
/
Article
/
Tab 12
/
Research Article
Spectrophotometric Determination of Iron(II) and Cobalt(II) by Direct, Derivative, and Simultaneous Methods Using 2-Hydroxy-1-Naphthaldehyde-p-Hydroxybenzoichydrazone
Table 12
Determination of cobalt in environmental water samples.
Sample
cobalt (
μ
g mL
−1
)
Added
Found
Recovery (%)
RSD (%)
Tap water (municipality water supply, Anantapur)
0.0
0.32
—
2.5
1.5
1.80
98.90
1.8
3.0
3.35
100.90
3.0
4.5
4.83
100.20
2.2
River water (Penna, Tadipatri.)
0.0
1.52
—
3.0
1.5
3.00
99.34
1.6
3.0
4.55
100.66
2.8
4.5
5.95
98.84
4.0
Drain water (vanaspati industry, Tadipatri.
0.0
3.60
—
1.7
1.5
5.31
104.12
3.2
3.0
6.48
98.18
2.5
4.5
8.07
99.63
3.6