Background

Measurement of phosphorus (P₂O₅) and potassium (K₂O) by empirical calibration is demonstrated. Fundamental Parameters (FP) is also demonstrated to include the screening of minor elements when no or only a few reference standards are available for calibration using Rigaku Matching Library. The primary nutrients in fertilizers are nitrogen, phosphorus and potassium, NPK. While XRF does not measure the nitrogen, it is an ideal tool to measure and control the proper levels of phosphorus (as P₂O₅) and potassium (as K₂O) in the production of fertilizers. Using a one-time calibration the measurement is direct and simple using a 1 or 2 minute measurement time or even shorting allowing for high sample throughput and batch analysis. The Rigaku NEX QC Series are ideal systems for at-line quality control checks, in the QC lab and for researchers alike. Use standalone models with touchscreen interface or add the PC-based QuantEZ software for more detailed analysis using Fundamental Parameters.