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International Journal of Analytical Chemistry
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International Journal of Analytical Chemistry
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2012
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Article
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Tab 4
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Research Article
Spectrophotometric Determination of Iron(II) and Cobalt(II) by Direct, Derivative, and Simultaneous Methods Using 2-Hydroxy-1-Naphthaldehyde-p-Hydroxybenzoichydrazone
Table 4
Tolerance limits of some cations in derivative methods.
Foreign ion
Tolerance limit (in folds)
Direct method
First derivative
Second derivative
Third derivative
Ag(I)
14
18
35
22
Hg(II)
11
20
40
30
U(VI)
11
12
25
18
Mn(II)
7
20
16
20
Th(IV)
5
10
16
20
In(III)
7
28
48
34
Au(III)
4
35
55
28
Sn(II)
<1
8
15
22
Co(II)
<1
interfere
7
15
Ni(II)
<1
interfere
5
10
Cu(II)
<1
5
12
10