酸处理对木灰中钾、钙、硅的溶解度和化学形态的影响

IF 1.9 4区农林科学 Q3 ENVIRONMENTAL SCIENCES

Soil Science and Plant Nutrition Pub Date : 2023-07-04 DOI:10.1080/00380768.2023.2230228

S. Takeuchi, Kosei Yamashita, Y. Hashimoto

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引用次数: 0

摘要

摘要本研究研究了稀释硫酸或磷酸溶液处理木灰中植物营养元素(K、Ca、Si)的溶解度与化学形态的关系。将稀释后的酸溶液加入电厂粉煤灰(FA)中，分析未经处理和经酸处理的FA的K、Ca和Si含量。用x射线衍射(XRD)对未处理和酸处理的FAs进行了晶相鉴定，用x射线吸收近边结构(XANES)光谱对Si的种类进行了测定。硫酸和磷酸处理对钾在FA中的溶解度没有影响。这些酸的加入降低了FA中的水溶性K和柠檬酸可溶性K。与未处理FA相比，经磷酸处理FA的水溶性Ca含量变化不显著，但经硫酸处理FA的水溶性Ca含量增加了65倍。结果表明，未经处理的FA中的主要Ca种CaCO3通过硫酸处理转化为同长岩和石膏。与未处理FA相比，酸处理FA中盐酸可溶性Si含量降低。相比之下，NaOH-soluble Si fraction(一种选择性提取硅胶的方法)在磷酸处理的FA中明显增加。XANES分析结果表明，10-30%硫酸或10-30%磷酸处理的FA样品的Si聚合度低于未处理的FA样品，这与Si在FA中的溶解度增加大致相符。然而,FA 30%硫酸处理可溶性硅尽管较低聚合度低于英足总,这是归因于博士这些结果表明较低溶解度的变化如果酸洗FA是影响聚合度和减少博士从肥料使用的角度FA,硫酸酸洗灰,由水溶性钙和柠檬酸可溶性钙、适用于Ca肥料,磷酸处理后的灰分具有较高的碱溶性硅，适合作硅肥

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Changes in solubility and chemical speciation of potassium, calcium, and silicon in wood ash by acid treatment

ABSTRACT This study investigated the relationship between the solubility and the chemical speciation of plant nutritional elements (K, Ca, and Si) in wood ash treated with a dilute solution of sulfuric acid or phosphoric acid. The diluted acid solutions were added to fly ash (FA) collected from a power plant, and the untreated and acid-treated FAs were analyzed for their contents of K, Ca, and Si. The crystalline phases of the untreated and acid-treated FAs were identified using X-ray diffraction (XRD), and the Si species were determined using X-ray absorption near-edge structure (XANES) spectroscopy. Sulfuric acid and phosphoric acid treatments did not affect the solubility of K in FA. Water soluble and citrate soluble K in FA were decreased by the addition of these acids. The water soluble Ca content in FA treated with phosphoric acid did not show a significant change compared to that in the untreated FA, but it increased up to 65 times in FA treated with sulfuric acid. It is suggested that CaCO3, which was the main Ca species in the untreated FA, was transformed into syngenite and gypsum by the sulfuric acid treatment. Hydrochloric acid soluble Si in the acid-treated FA decreased compared to that in the untreated FA. In contrast, the NaOH-soluble Si fraction, a method for selectively extracting silica gel, increased especially in the phosphoric acid-treated FA. The results of XANES analysis showed that the FA samples treated with 10–30% sulfuric acid or 10–30% phosphoric acid had a lower degree of Si polymerization than the untreated FA, which corresponded generally to the increased Si solubility in FAs. However, FA treated with 30% sulfuric acid had lower soluble Si despite a lower degree of polymerization than FA, which was attributed to a lower pH. These results suggest that the change in solubility of Si in the acid-treated FA was influenced by the degree of polymerization and the decrease in pH. From the viewpoint of a fertilizer use of FA, sulfuric acid-treated ash, which consists of both water soluble Ca and citrate soluble Ca, is suitable for Ca fertilizer, and phosphoric acid-treated ash, which has high NaOH-soluble Si, is suitable for Si fertilizer

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来源期刊

Soil Science and Plant Nutrition 农林科学-农艺学

CiteScore

4.80

自引率

15.00%

发文量

审稿时长

18-36 weeks

期刊介绍： Soil Science and Plant Nutrition is the official English journal of the Japanese Society of Soil Science and Plant Nutrition (JSSSPN), and publishes original research and reviews in soil physics, chemistry and mineralogy; soil biology; plant nutrition; soil genesis, classification and survey; soil fertility; fertilizers and soil amendments; environment; socio cultural soil science. The Journal publishes full length papers, short papers, and reviews.