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葡萄糖酸盐,草甘和酸盐. 了解它们在矿物表面的吸附趋势

Mariana Gentile¹, Carina Luengo¹, Juan Xiong²

¹INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina.

The Science of the total environment

|September 24, 2025

概括

酸盐,草甘 (GLY) 和葡萄酸盐 (GLU) 除草剂在石上具有不同的吸附作用. 吸附强度取决于分子结构,酸盐吸附最多,GLU吸附最少,影响环境命运.

科学领域:

环境化学环境化学
土壤科学土壤科学
农业化学品农业化学品农业化学品

背景情况:

转基因作物,主要在美国,巴西和阿根廷,利用草甘 (GLY) 和酸 (GLU) 等除草剂.
广泛使用除草剂引发了环境问题,因为它们的有机性质和与土壤矿物质的潜在相互作用.
了解矿物表面的除草剂吸附对于评估其环境命运至关重要.

研究的目的:

为了研究和比较酸盐,GLY和GLU在广的pH范围 (2-12) 上在石上的吸附行为.
阐明分子结构,化学性质 (基本性,pKa) 和吸附亲和力之间的关系.
为预测含化合物的环境行为建立一个通用框架.

主要方法:

吸附异热量被用来量化酸盐,GLY和GLU在石上的吸附量.
使用减弱总反射率-里埃变换红外光谱 (ATR-FTIR) 来分析表面相互作用.
密度函数理论 (DFT) 的计算为穆利肯电荷和电子性质提供了洞察力.

主要成果:

在所有测试的pH值中,吸附趋势始终显示酸盐 > GLY >> GLU.
葡萄酸盐 (GLU) 仅在pH 2时表现出显著的吸附,在更高的pH值时吸附是可以忽略不计的.
吸附与PO组的基本性,P-OH组的pKa值和Mulliken电荷有很强的相关性,支持基于结构的吸附模型.

结论:

在石上有机化合物的吸附是由基本氧的数量和 (PO) 基的基度决定的.
通用吸附趋势PO(OH) 3 > PO(OH) 2R > PO(OH) RR ́为环境命运提供了一个预测框架.
这项研究提供了关于除草剂,杀虫剂和营养素的土壤相互作用的基本见解.

关键词:

哥斯提人哥斯提人是一个哥斯提人.杀草剂是一种除草剂.化合物是一种化合物.污染问题污染问题复杂的表面复杂的表面.

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The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

Factors Affecting Solubility

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide: