Determination of Fluorine Content in Coal by Fluorine Ion Selective Electrode after Sodium Carbonate Alkali Fusion
The fluorine element in coal is the main harmful element,and its content directly affects the quality of coke and the state of coke oven.In this paper,sodium carbonate was used to melt coal samples at 1050℃ for one hour,after which the sample was dissolved by hydrochloric acid at high temperature.Dilute sulfuric acid and dilute sodium hydroxide were used to adjust the acidity to 5.0～5.5.We selected caol standard samples to establish the detection curve,and fluorine ion selective electrode method was used to detect fluorine content in coal samples.The method is quite simple and does not require precipitation separation.The detection curve is established with the equivalent content of reference material reduces matrix interference,and the detection accuracy is good.The relative standard deviation and relative error are less than 1.0％.
coalfluorine ion selective electrode methodalkali fusionfluorinestandard curve method
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