Uncertainty Assessment of Phosphorus Content in Organic Fertilizers
Using the ammonium metavanadate-molybdate spectrophotometric method to determine the phosphorus content in organic fertilizers,uncertainty evaluation was conducted for the phosphorus content in organic fertilizers.According to the NY/T 525-2012 standard,key test steps for analyzing phosphorus content in organic fertilizers include preparation of sample solutions,use of standard substances,replicate experiments on samples,and instrument measurement.Uncertainty evaluations were performed separately for these steps,and the combined relative standard uncertainty was determined.The results show that the phosphorus content in organic fertilizers is X=(2.12±0.031)%with a coverage factor k=2.
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