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1“… prepared aqua regia (mixture of concentrated nitric acid and hydrochloric acid 1:3 ratio). 0.5 g of each…”
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2by Amir Hiszam, Aizzul Najmi“… respectively. All of the samples taken were analyse by using Aqua Regia method at 3:1 ratio chemical component…”
Published 2017
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3by Abu Bakar, Zulkiflli“… were digested using aqua regia and were determined by using atomic absorption spectrometer (AAS…”
Published 2012
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