Abstract

Experiments were carried out on fluorine leaching from rocks (alkaline agpaitic granite, dacite, and feldspar–quartz aleurite with 0.005 M solutions of acetic, tartaric, citric, and oxalic acids. The previously revealed decrease of fluorine leaching with organic acids compared to distilled water under an acidity increase within the 6.3–3.5 range of pH values was confirmed. In terms of leaching ability related to distilled water, the organic acids constitute a series: oxalic > citric > acetic ~ tartaric. It has been proposed that a decrease of pH values causes the sorption of fluorides resulting from the substitution of adsorbed hydroxyl ions. In view of this, the less intense fluorine leaching in acids compared to distilled water might be ascribed to sorption immobilization of fluoride ions on a solid phase. A positive correlation between the levels of leached fluorine and magnesium points to the existence of some general but undetermined mechanism of the transition of these elements from minerals into aquatic solutions.

中文翻译：

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岩石中氟的有机酸浸出模式

摘要

实验是用0.005 M的乙酸，酒石酸，柠檬酸和草酸溶液从岩石（碱性块石花岗岩，钠铁矿和长石-石英辉石中浸出氟）进行的，以前发现与蒸馏水相比，用有机​​酸浸出的氟减少了在酸度在pH值6.3-3.5范围内增加的情况下，已经证实，从与蒸馏水有关的浸出能力来看，有机酸构成了一系列：草酸>柠檬酸>乙酸〜酒石酸。因此，与蒸馏水相比，酸中氟的浸出强度较弱，这可能归因于氟离子在固相上的吸附固定。氟和镁的浸出水平之间呈正相关关系，表明这些元素从矿物质转变为水溶溶液存在一些普遍但尚未确定的机制。