Determination of potassium and sodium in iron ore by inductively coupled plasma mass spectrometry
In this paper,inductively coupled plasma mass spectrometry(ICP-MS)for the determination of potassium and sodium in iron ore was studied.Compared with conventional detection methods,this method has a lower detection limit.The parameters of digestion,the influence of reagent purity,the amount of acid added,plasma power,atomizer flow and sampling depth were optimized,and the method was evaluated by interference experiment,detection limit,precision and recovery experiment.The results show that the optimal dissolution conditions are as follows:the digestion temperature reaches 210℃and the holding time exceeds 20 min.The nitric acid,hydrochloric acid and hydrofluoric acid used in the dissolution process need to be purified.The optimal amount of acid added is 2.0 mL hydrofluoric acid,0.5 mL hydrofluoric acid and 1.0 mL nitric acid.The optimal analysis conditions are:plasma power of 900 W,atomizing gas flow rate of 1.00 L/min,sampling depth of 150×102 µm.The detection limits of potassium and sodium were 1.02 μg/L and 1.53 μg/L,and the detection limits were 4.40 μg/L and 5.10 μg/L.The recoveries were between 90%and 110%,and the precision(RSD)was<5%.
inductively coupled plasma mass spectrometryiron orepotassiumsodium
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