2.5. Calibration procedure
For spectrofluorimetric determination of tin in aqueous solu-
tion, a series of 13 standard solutions of tin were measured by
following the procedure under Section 2.3. The calibration graph
was found to be linear in the ranges of 0.01–0.8gml
−1. The
equation for calibration graph isF = 2.12 + 128.33C(r = 0.9991),
where F is the fluorescence intensity (in arbitrary units) and C
is the concentration of tin expressed in gml
−1.