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Determination of trace phosphorus in limestone by Ion Exchange-Inductively Coupled Plasma Atomic Emission Spectrometry

Zhang Yang-zu(National ceater for measuring and testing,Shanghai,China Shanghai Institute of testing technology 200233,Shanghai)  
A method was developed for determination of phosphorus in limestone by ICP-AES. Sample material was digested with HF. HNO_3 and HClO_4,After coexisting cation was separated from sample solution through Dowex 50 wx8 Cation-exchange Resin, Sample solution containing phosphorus was determined directly by ICP-AES. The relative standard deviation between sample portions was in 2~3%, the recovery was between 96% to 102%.
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