A study was made on the linearity of tin calibration.
Two calibration ranges were evaluated since tin may occur
in most foods at low levels (several mg/kg), but may also
occur at higher concentrations (several hundred mg/kg) in
acidic products, e.g. fruit juices. The first range was
between 0 and 1000 ppb and gave an R2>0.9992, while the
higher range was between 0 and 15 ppm with R2>0.9995.