Abstract
A rapid photometric metod for the determination of fluoride in micas is described. After separating interfering ions, the fluorine is determined by measuring the absorbancy of ferric thiocyanate which has been faded by the fluoride ion. The procedure is more simple and more rapid than the gravimetric method of analysis for fluorine. The weight of sample needed for analysis is only a tenth of that required for the gravimetric method. The method is applicable for the solution with the concentration range of 0.11.0 mg F- in 100 ml. The error found is 2% for 1.0 mg F-, and 20% for 0.1 mg F-.
