GFAAS Determination of Copper and Lead Released from Bamboo Leaves with Suspension-Sample Introduction

The sample of bamboo leaves (10.000 0 g) was placed into a 500 mL beaker and 400 mL of water was added, and the mixture was boiled for about 30 min, filtered and concentrated to 200 mL. After centrifugation for 30 min, the supernatant was taken as the water decoction of bambos leaves. The powder of bamboo leaves (0.018 0 g; passing through sieve with bore diameter of 0.075 mm), 3.5 mL of 0.15% (w) agar solution and 1 mL of HNO₃ (2+98) solution were placed into a 10 mL colorimetric tube and then made its volume up to 10 mL with water. The mixture was treated ultrasonically for 15 min to obtain a suspension of bamboo leaves. Copper and lead in the water decoction and the suspension of bamboo leaves were determined separately by graphite furnace atomic absorption spectrometry (GFAAS). The rate of dissolution of copper and lead from bamboo leaves were calculated. It was found that the dissolution rates of copper and lead were 7.37%, 13.34%, respectively. Values of RSDs (n=6) found were all less than 5%.