GB/T 5195.6-2006

This standard specifies the principles, reagents, instruments, samples, analytical procedures, calculation of analytical results, and allowable deviations for determining the phosphorus content in fluorite. This standard includes two methods: the molybdenum blue spectrophotometry, with a measurement range (mass fraction expressed as P): 0.002% to 0.50%; and the ammonium phosphomolybdate reduction spectrophotometry, with a measurement range (mass fraction expressed as P): 0.001% to 0.30%. This standard is applicable to the determination of phosphorus content in fluorite.