超声提取—离子选择电极法测定化肥样品中的氟

doi:10.11720/wtyht.2023.1150

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Abstract

As shown by the geochemical survey of national land quality, the land with excess fluorine in China covers an area of about 315 000 km². As an element closely related to human health, fluorine has received wide attention and has been studied. Especially in recent years, the high-fluorine fertilizers used in agricultural activities have become a potential source of fluorine in soils. Moreover, the circulation and migration patterns of fluorine in soils, animals, and plants are yet to be further investigated. To prepare for a new round of national soil survey and modern health-related geological survey, it is necessary to develop a method to accurately determine the fluorine content in chemical fertilizers. Through experiments, this study compared four methods for sample decomposition, namely the extraction methods based on HCl boiling, NaOH molten water, and the Na₂O₂ molten water and the HCl ultrasonic extraction method at room temperature. The results show that the optimal method for sample pretreatment is to extract and decompose samples using ultrasound and HCl at room temperature, adjust the acidity using NaOH-H₂SO₄, and take sodium citrate as the ion buffering agent. Through investigation, the ultrasonic extraction time and temperature were determined to be 20 min and 20 ℃, respectively. The main quality parameters of the method were determined under the optimal sample pretreatment conditions, including the limit of detection of 1.63×10^-6, the precision of 0.98%, and the recovery rate of 91%~108%. The results of this study show that the pretreatment of this method is simple, fast, and easy to operate. With the mode of establishing standard curves in sections, the quality parameters determined can fully meet the requirements for the analysis of chemical fertilizers.

Key words： ion selective electrode method fluorine chemical fertilizer ultrasonic extraction

Received: 30 March 2022 Published: 05 July 2023

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	X830.2

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	Articles by authors
	Bin LIU
	Jin-Li XU
	Xue-Miao DU
	Rui-Ling TANG
	Peng-Peng ZHANG
	Jin-Feng BAI
	Lin-Song YU
	Fang WAN

Cite this article:

Bin LIU,Jin-Li XU,Xue-Miao DU, et al. Determination of fluorine content in chemical fertilizer samples using the ultrasonic extraction-ion selective electrode method[J]. Geophysical and Geochemical Exploration, 2023, 47(3): 775-781.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1150 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I3/775

Comparison of fluorine content in different melting methods

Comparison of fluorine extraction under different ultrasonic conditions

Recovery rate of different types of chemical fertilizers

Comparison of determination results between this artical method and national standard method

Comparison of fluorine content of various types of chemical fertilizers

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