Characterization of Atmospheric Processes of Brevetoxins in Sea Spray Aerosols from Red Tide Events
Characterization of Atmospheric Processes of Brevetoxins in Sea Spray Aerosols from Red Tide Events
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赤潮事件海浪气溶胶中短尾藻毒素的大气过程特征
DOI：
10.1021/acs.est.1c05740
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发表时间：
2022
影响因子：
11.4
通讯作者：
Yu, Zechen
中科院分区：
文献类型：
--
作者：
Sem, Karen;Jang, Myoseon;Pierce, Richard;Blum, Patricia;Yu, Zechen
大气过程可以影响海洋喷雾气溶胶（SSA）中有害毒素的寿命。本研究的特点是在不同的环境条件下，短毒素（BTx）在SSA的降解。在佛罗里达Manasota的短凯伦藻水华期间收集的海水样品被雾化到一个大型室外光化学室中，以模拟雾化毒素的大气氧化，然后在有或无阳光和/或O3的情况下老化。在老化过程中，使用颗粒-液体取样器收集气溶胶样品。使用酶联免疫吸附试验（ELISA）和高效液相色谱/串联质谱法测定其BTx浓度。ELISA法测得BTx臭氧分解速率常数为5.74 ± 0.21 × 103 M ~（-1）s ~（-1）。在20 ppb O3存在下，87.5% BTx的相应衰变寿命为7.08 ± 0.26 h，表明气溶胶化的BTx在SSA沉积前仍可在夜间长距离传播。在SSA中的BTx浓度下降更迅速，在阳光的存在下，比在其情况下，由于氧化与光化学产生的OH自由基。
Atmospheric processes can affect the longevity of harmful toxins in sea spray aerosols (SSA). This study characterized the degradation of brevetoxin (BTx) in SSA under different environmental conditions. The samples of seawater collected during aKarenia brevisbloom in Manasota, Florida, were nebulized into a large outdoor photochemical chamber to mimic the atmospheric oxidation of aerosolized toxins and then aged in the presence or absence of sunlight and/or O3. Aerosol samples were collected during the aging process using a Particle-Into-Liquid Sampler. Their BTx concentrations were measured using an enzyme-linked immuno-sorbent assay (ELISA) and high-performance liquid chromatography/tandem mass spectroscopy. The BTx ozonolysis rate constant measured by ELISA was 5.74 ± 0.21 × 103M–1s–1. The corresponding lifetime for decay of 87.5% BTx in the presence of 20 ppb of O3was 7.08 ± 0.26 h, suggesting that aerosolized BTx can still travel long distances at night before SSA deposition. BTx concentrations in SSA decreased more rapidly in the presence of sunlight than in its absence due to oxidation with photochemically produced OH radicals.