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Preparation of modified mineralized fulvic acid for inhibition of crystallization of calcium phosphate

Quanxian Hua, Zihan Nie, Yinhui Luo, Xianming Feng, Baoming Wang, Jianwei Tang, and Yong Liu

School of Chemical Engineering, National Center for Research and Popularization On Calcium, Magnesium, Phosphate and Compound Fertilizer Technology, Zhengzhou University, Zhengzhou, China



Received: 2 June 2021  Accepted: 1 September 2021


Precipitation of calcium phosphate leads to pipeline blockage during irrigation with water-soluble fertilizer. To address this problem, mineralized fulvic acid, which has good biological compatibility and high-water solubility, was modified to improve solubility of calcium phosphate. Mineralized fulvic acid was used with potassium persulfate (K2S2O8), as initiator, and acrylic acid, as the graft monomer, to synthesize a modified mineralized fulvic acid that was investigated as a solubilizing agent for anti-scaling and dispersing properties of calcium phosphate. Optimum process conditions used an initiator dosage of 20% and monomer ratio of 1:1. The carboxyl group content of modified mineralized fulvic acid was significantly increased compared with unmodified mineralized fulvic acid under these reaction conditions. The modified mineralized fulvic acid product easily chelated with calcium ions, which significantly increased dispersibility of calcium phosphate in solution and effectively inhibited its precipitation. The anti-scaling of calcium phosphate reached 97.14%. The results proved that MMFA significantly enhanced the complexation of calcium ions and greatly improved resistance to solubilizing and dispersion of calcium phosphate.

Graphic abstract

Keywords: Modified mineralized fulvic acid; Calcium phosphate; Complexation performance; Anti-scaling properties; Dispersibility

Full paper is available at

DOI: 10.1007/s11696-021-01855-w


Chemical Papers 76 (1) 203–211 (2022)

Monday, May 27, 2024

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