Determination of total potassium in plants samples by microwave digestion-flame photometry

doi:10.14088/j.cnki.issn0439-8114.2019.10.033

Abstract

Abstract: A new method for the determination of total potassium in plants by microwave digestion-flame photometry was established by optimizing the conditions of digested acid, maximum digestion temperature and retention time of microwave digestion. The results showed that the optimal digestion condition was as follows：6 mL HNO₃+2 mL H₂O₂ acid system, maximum digestion temperature 160 ℃ and retention time 15 min, and the detection limit was 0.002 mg/g. The results of the total potassium content of two plant reference materials determined by the optimal digestion procedure showed that the data was within the range of the certificate standard values. The recovery rates of total potassium contents of rice plant samples tested by the optimal digestion procedure were 97.5%~103.0% and the relative standard deviation was 0.63%~2.27%. The results suggested that this method is suitable for the determination of total potassium in different parts of plants, and the operation is simple and safe, and the result is accurate and reliable.

Key words: microwave digestion, flame photometry, plant, total potassium

CLC Number:

S132

TAO Shu-hua, GONG Hao-ru, CHEN Zu-wu, CHEN Ying-zi, MIAO Xue-xue, WANG Jie-min. Determination of total potassium in plants samples by microwave digestion-flame photometry[J]. HUBEI AGRICULTURAL SCIENCES, 2019, 58(10): 142-145.

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