Subsamples of the ground materials were
digested with ultra-pure HNO3 (5 ml) and 30 percent H2O2 (2 ml) using a
microwave (Mars-5, CEM Corp., USA) and the total Cd concentration was determined using an ICP-MS (ICP-MS 7700, Agilent Technologies, Santa Clara, CA, USA)
Subsamples of the ground materials were
digested with ultra-pure HNO3 (5 ml) and 30 percent H2O2 (2 ml) using a
microwave (Mars-5, CEM Corp., USA) and the total Cd concentration was determined using an ICP-MS (ICP-MS 7700, Agilent Technologies, Santa Clara, CA, USA)
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