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

Figure 3

Mole ratio method of CHTB and Sn(II). Curve A: 435 nm, Curve B: 410 nm, and Curve C: 450 nm.