A Rapid Extractive Spectrophotometric Method for the Determination of Tin with 6-Chloro-3-hydroxy-2-(2′-thienyl)-4-oxo-4H-1-benzopyran

Table 1

The analysis of various samples with the proposed method.

Sample composition
Matrix*	Sn added, g	Sn found**, g
Zn(0.02), Pb(0.01), Cu(0.001)^a	10.0	10.03 ± 0.85
Cu(0.070), Co(0.014)^b	8.0	7.89 ± 0.71
Co(1), Ba(2), U(0.01), Mo(0.020)^c	7.0	6.83 ± 0.58
Cd(2), Fe(0.1), V(0.1)^d	12.0	11.96 ± 0.71
Cr(0.1), Sr(1), Ag(0.5), Zr(0.01)^e	12.0	11.99 ± 0.62
Pb (2), Nb(0.1), Th(0.05) ^f	5.0	5.13 ± 1.63
As(2), Se(3), Ti(0.1)^e	8.0	7.92 ± 0.56
Re(0.01), Ta(0.05), Bi(1)^g	5.0	5.03 ± 0.82
Be(2), Pt(0.01), Ir(0.01)	10.0	9.85 ± 0.41
Gun metal	4.9%^h	4.48% ± 0.72
Tin can	—	0.15%^i

*Amount of metal ion shown in parentheses is in mg. **Average of triplicate analyses; mean ± % RSD. ^a,bCorrespond to kneiss metal and argental, respectively. ^cIn presence of 0.5 mg dithionite. ^dIn presence of 100 mg ascorbic acid. ^eIn presence of 7 mg phosphate. ^fIn presence of 4 mg oxalate. ^gIn presence of 100 mg iodide. ^hCertified value. ⁱConfirmed by SnO₂ method.