Tin in canned fruit juice:

Availability of fruit juice in tinned cans is becoming increasingly common though it is also marketed in cartons. Since tin is likely to be leached in acidic medium of juice the contents of could get contaminated. Therefore its determination is quite important to ascertain the contamination, if any. Sn could be determined successfully through graphite furnace atomic absorption spectrophotometry (GFAAS). In a classic determination, the juice solution is prepared in dil HCl and boiled till it becomes clear. In case the solution is still turbid or colloidal then it is centrifuged and only supernatant is taken for analysis. Since the concentration of Sn within juice is likely to be very low, standards are prepared within the concentration range 25-100 ppb together with acid as blank. The measurement is made at a wavelength of 224.6 nm.