Determination of Arsenic and Lead in Tipping Paper with Atomic Absorption Spectrometry

The methods for determining arsenic and lead in tipping paper with hydride generator atomic absorption spectroscopy or graphite furnace atomic absorption spectrometry were established. The results showed that: 1) the optimal determining condition for lead was: concentration of HNO₃ in sample was 1.0% (v/v) and added with matrix improver; 2) the optimal condition for arsenic determination was: concentrations of HNO₃ was 0.05mol/L and that of NaBH₄ was 2.0% (g/g) in sample, concentration of HCl in carrying solution was 5.0% (v/v); and 3) the recoveries of arsenic and lead were in the range of 96.0%-103.0% with RSD≤6.65%.