Determination of Hydrogen Fluoride in Air in the Progress of Phosphate Fertilizer Production by Ion-Chromatography

DX-120 Ion-Chromatographic system was used to determine hydrogen fluoride in air in the progress of phosphate fertilizer production with the condition of a mixed solution of 3.5 mmol/LNa2CO3 and 1.0 mmol/LNaHCO3 as eluent,a velocity of flow at 1.2 mL/min,25 μL reagent,2000 Psi instrument pressure and a temperature of 10～25 ℃.The detection limit was 10 μg/L,the precision experiment result showed that the RSD were 2.54 %,1.15 %,2.07 %,2.37 %,1.98 % respectively when the hydrogen fluoride of consistency were 0.10,0.50,1.00,1.50,2.00 mg/L respectively.And the rates of recovery were 96.0 % ～102.0 %.This method was proved to be accurate,simple,rapid and the disturbance of the other anion and chlorine ion can be avoided.It was also considered as an ideal method to determine the hydrogen chloride in the air.