Wildfires: Identification of a new suite of aromatic polycarboxylic acids in ash and surface water.
Wildfires: Identification of a new suite of aromatic polycarboxylic acids in ash and surface water.
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野火：在灰烬和地表水中鉴定出一套新的芳香族多羧酸。
DOI：
10.1016/j.scitotenv.2020.144661
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
F. Rosario‐Ortiz
中科院分区：
文献类型：
--
作者：
I. Ferrer;E. Thurman;J. Zweigenbaum;S. Murphy;J. Webster;F. Rosario‐Ortiz
分析了在四个不同地理位置(加利福尼亚州、科罗拉多州、堪萨斯州和艾伯塔省)野火后收集的火山灰和地表水样本。灰样用去离子水浸出，渗滤液用固相萃取浓缩，用液相色谱/飞行时间质谱仪进行分析。此外，从加利福尼亚州和科罗拉多州最近受到火灾影响的分水岭收集了三个地表水样本和一个蒸渗仪水样，并以类似的方式进行了分析。首次在垃圾渗滤液和水样中发现了一组含有两个和三个羧基的苯多羧酸(BPCA)及其相应的异构体。还发现了一种吡啶羧酸(PCA)，即3，5-吡啶二酸。此外，推测还鉴定了其他羧化芳香酸：喹啉、萘和苯并呋喃甲酸羧酸盐。野火灰烬、受控木灰和火灾后地表水样本表明，燃烧的木质材料、地表植物材料和加热的o层土壤有机质都对径流中的BPCAs和PCAs有贡献。这项研究是第一次在野火灰烬和地表水样本中鉴定出这套芳香酸。这些数据对野火溶解有机物的性质做出了重要贡献，有助于更好地了解野火对水质和饮用水水源的影响。
Ash and surface water samples collected after wildfires in four different geographical locations (California, Colorado, Kansas and Alberta) were analyzed. The ash samples were leached with deionized water, and leachates were concentrated by solid phase extraction and analyzed by liquid chromatography/time-of-flight mass spectrometry. In addition, three surface water samples and a lysimeter water sample were collected from watersheds recently affected by fire in California and Colorado, and analyzed in similar fashion. A suite of benzene polycarboxylic acids (BPCAs), with two and three carboxyl groups and their corresponding isomers were identified for the first time in both ash leachates and water samples. Also found was a pyridine carboxylic acid (PCA), 3,5-pyridine dicarboxylic acid. Furthermore, putative identifications were made for other carboxylated aromatic acids: quinolinic, naphthalenic, and benzofuranoic acid carboxylates. The wildfire ashes, a controlled wood ash, and post-fire surface water samples suggest that burned woody material, along with surface plant-material and heated o-horizon soil organic matter, contribute to both BPCAs and PCAs in runoff. This study is the first of its kind to identify this suite of aromatic acids in wildfire ash and surface water samples. These data make an important contribution to the nature of dissolved organic matter from wildfire and are useful to better understand the impact of wildfire on water quality and drinking water sources.