Verification of the test method for determination of boron in NPK blending fertilizer using inductively coupled plasma-optical emission spectrometry (ICP-OES)

Verification of the test method for determining boron (B) in NPK blending fertilizer using Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) at PT. Pupuk Kalimantan Timur has been conducted. Determination of B in NPK fertilizer refers to the Testing Methods for Fertilizers Incorporated Administrative Agency Food and Agricultural Materials Inspection Center (FAMIC 2016). The optimum parameters of the analytical performance method were performed. The results of the research are good, showed with the linearity value (R2) were 0.9997, the limit of detection (LOD) was 0.83 mg/L and the limit of quantification (LOQ) was 0.88 mg/L. The precision is shown as percentage of coefficient of variance (% CV) < 2/3 CV Horwitz values and the accuracy of this method is shown by a recovery percentage was 97-105%. Based on the results of research it can be concluded that the verification of the test method (FAMIC 2016) has been verified and can be used for routine analysis at the Quality Testing Laboratory of PT. Pupuk Kalimantan Timur.