Reactivity of silicate–phosphate glasses in soil environment

• Published in: Journal of alloys and compounds Vol. 468; no. 1; pp. 246 - 253
• Main Authors: Waclawska, I., Szumera, M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 22.01.2009; Elsevier
• Subjects: Agronomy. Soil science and plant productions; Amorphous materials; Applied sciences; Biological and medical sciences; Chemical industry and chemicals; Corrosion; Energy-disperse X-ray (EDS); Exact sciences and technology; Fertilisers; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Inductively-coupled plasma atomic emission spectrography (ICP-AES); Industrial chemicals; Liquid–solid reactions; Nitrogen, phosphorus, potassium fertilizations; Phosphorus fertilization; Scanning electron microscopy (SEM); Soil-plant relationships. Soil fertility. Fertilization. Amendments; Energy-disperse X-ray (EDS); Amorphous materials; Inductively-coupled plasma atomic emission spectrography (ICP-AES); Corrosion; Scanning electron microscopy (SEM); Liquid–solid reactions; Phosphates; Amorphous material; Liquid-solid reactions; Material science; Phosphosilicate glasses; Atomic emission spectrometry; Inorganic fertilizer; Phosphate fertilizer; Silicates; Inductive coupling plasma spectrometry; Inorganic element; Inorganic compound; Inorganic material; Soil science; Soil interaction; Chemical reactivity; Soil solution; Soil chemistry; Macronutrient(mineral); Scanning electron microscopy; Solubility; Silicon compound; Soils; Inorganic chemistry; Fertilizer industry; Slow releasing fertilizer; Multiple system; Water glass; Reaction medium; Phosphorus compound; Liquid solid reaction; Energy-dispersive X-ray analysis
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2007.12.093

Mechanism of chemical reactivity of glasses of the K 2O–MgO–CaO–P 2O 5–SiO 2 system, acting as slow release fertilizers in soil solutions was presented. The solubility of glasses in soil and soil simulated solutions were studied by chemical analysis (ICP-AES, EDS) and SEM observations. It has been found that the chemical reactivity of silicate–phosphate glasses in the soil environment comprises: gradual destruction of the internal structure of glass and washing out of the glass components, formation on the glass surface of a layer of metastable solid products and gradual washing out of the components of the surface layer.