Penentuan Kadar Kalium pada Pupuk NPK dengan Spektrofotometri Serapan Atom di Balai Besar Perbenihan dan Proteksi Tanaman Perkebunan (BBPPTP) Medan

Abstract

Analysis of Potassium levels in Sodium, Phosphorus, Potassium (NPK) fertilizers using atomic absorption spectrophotometry at the Center for Plantation Seeds and Plant Protection (BBPPTP) Medan. With the aim of knowing the percentage of total K2O content and requirements for Potassium content of Sodium, Phosphorus, Potassium (NPK) fertilizer according to SNI quality standards. Weighed 0.250 g of Sodium, Phosphorus, Potassium (NPK) fertilizer powder, put into a 100 mL measuring flask, added 10 mL of 25% HCl, heated on a hot plate until completely dissolved and boiled for 15 minutes, then diluted using ion-free water, after it cooled volume was determined to the mark of 100 mL, homogenized. Left overnight, filtered using filter paper, then pipetted 1 mL of the filtrate into a test tube then added 9 mL of deionized water, then stirred using a vortex until homogeneous. Then analyzed using Atomic Absorption Spectrophotometry with the K series as a comparison. The value of total K2O content in Nitrogen, Phosphorus, Potassium (NPK) fertilizers was obtained an average of 14.39% - 16.32%. The K value levels in the analyzed Nitrogen, Phosphorus, Potassium (NPK) fertilizers meet the quality standards of SNI 2803:2010, namely the minimum K content is set at 8%.