Climate change coupled with inappropriate burning practices has increased large-scale wildfires in Brazilian tropical savannahs (Cerrado). Considering that the effects of ash from wildfires on water parameters are scarcely known in tropical savannahs, this study investigated the chemical changes caused by ash in the soft water, commonly used for bioassays. To this end, ash samples were collected immediately following a fire in a Cerrado area (Federal District, Brazil) and put into water (1:10 ash:soft-water m/v) to check physical parameters under laboratory conditions. Major water-extractable elements (K⁺, SO₄²⁻, Ca²⁺_, PO₄³⁻, Na⁺, Mg²⁺) from ash strongly altered water quality parameters: elevated total dissolved solids and conductivity levels as well as an increase in pH and decrease in dissolved oxygen concentration were reported over the course of the experiment (15 days) compared to control conditions. Our results point out relevant solubilized compounds from ashes which may potentially impact water quality in post-fire scenarios.

气候变化加上不适当的燃烧做法增加了巴西热带大草原（塞拉多）的大规模野火。考虑到野火产生的灰烬对热带大草原中水参数的影响鲜为人知，本研究调查了软水中灰烬引起的化学变化，常用于生物测定。为此，在塞拉多地区（巴西联邦区）发生火灾后立即收集灰分样品并将其放入水中（灰分：软水m/v为1:10 ）以在实验室条件下检查物理参数。主要的水可萃取元素（K ⁺、SO ₄ ^{2 -}、Ca ²⁺ _、 PO ₄³⁻ , Na ⁺ , Mg ²⁺ ) 来自灰烬的水质参数强烈改变：在实验过程中（15 天）报告了总溶解固体和电导率水平升高以及 pH 值升高和溶解氧浓度降低与对照条件相比。我们的结果指出来自灰烬的相关溶解化合​​物可能会影响火灾后的水质。