Ultrasound-assisted Extraction of Cr, K, Na, Pb, and Zn in NPK Fertilizers and Determination by FAAS and FAES

作者：Lourdes Angela Ma F O^*; Mimura Aparecida M S; Sousa Rafael A; Silva Julio C J

来源：Atomic Spectroscopy, 2016, 37(3): 120-124.

DOI：10.46770/as.2016.03.006

The use of ultrasound radiation for the extraction of Cr, K, Na, Pb, and Zn in NPK fertilizer samples was investigated, and their determination by flame atomic absorption (FAAS) and emission spectrometry (FAES). Extraction was performed using 0.05 g of sample, 5.0 mL of HNO3+HCl (50% v/v), and six steps of sonication (20 minutes) in an ultrasound bath, followed by homogenization with a vortex mixer (1 minute). The LOD and LOQ values ranged from 0.6 and 1.8 mg kg(-1) and from 3.1 to 6.1 mg kg(-1), respectively. The method showed adequate precision (RSD < 5%) and accuracy (recoveries between 90 and 103%). The proposed method requires only small amounts of sample and reagents. All sample pretreatment is carried out in one single flask which avoids sample contamination and analyte loss. The analyte concentrations in the samples were found to be below the maximum limits as established by Brazilian legislation.

• 出版日期2016-6