The concentrations of heavy metals, namely, Cd, Cr, Pb, Cu, Zn, As, Ba, and Ni, in raw material were tested through microwave- assisted acid digestion (MW-AD) on an oven(ETHOS 1, Milestone Inc.). Firstly, 0.3 g of ash sample was weighed and placed in a pressure-resistant PTFE kettle. Then, 5 mL of HNO3, 4 mL of HCl, and 3 mL of HF was added into the kettle. The mixture of ash and acids was kept under room temperature for 0.5 hour, and
The concentrations of heavy metals, namely, Cd, Cr, Pb, Cu, Zn, As, Ba, and Ni, in raw material were tested through microwave- assisted acid digestion (MW-AD) on an oven(ETHOS 1, Milestone Inc.). Firstly, 0.3 g of ash sample was weighed and placed in a pressure-resistant PTFE kettle. Then, 5 mL of HNO3, 4 mL of HCl, and 3 mL of HF was added into the kettle. The mixture of ash and acids was kept under room temperature for 0.5 hour, and
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