Molina Carolina, Manzano Carlos A, Toro A Richard, Leiva G Manuel A
Department of Chemistry, Faculty of Science, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago, Chile.
Department of Chemistry, Faculty of Science, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago, Chile; School of Public Health, San Diego State University, 5500 Campanile Dr., San Diego, CA 92182, United States.
Environ Int. 2023 Mar;173:107866. doi: 10.1016/j.envint.2023.107866. Epub 2023 Mar 7.
Oxidative potential (OP) has gained attention as a parameter that can reveal the ability of different properties of particulate matter (PM) to generate reactive oxygen species (ROS) as one single value. Moreover, OP is also believed to be a predictor of toxicity and hence the health effects of PM. This study evaluated the OP of PM, PM,and PMsamples using dithiothreitol assays in two cities of Chile (Santiago and Chillán). The results showed that the OP was different between cities, PM size fractions, and seasons. Additionally, OP was strongly correlated with certain metals and meteorological variables. Higher mass-normalized OP was observed during cold periods in Chillán and warm periods in Santiago and was associated with PM and PM. On the other hand, volume-normalized OP was higher during winter in both cities and for PM. Additionally, we compared the OP values to the Air Quality Index (AQI) scale and found cases of days that were classified as having "good" air quality (supposed to be less harmful to health) showing extremely high OP values that were similar to those on days that were classified as "unhealthy". Based on these results,we suggest using the OP as a complementary measure to the PM mass concentration because it includes important new information related to PM properties and compositions that could help improvecurrent air quality management tools.
氧化潜力（OP）作为一个参数已受到关注，它能够以单一数值揭示颗粒物（PM）不同特性产生活性氧（ROS）的能力。此外，OP还被认为是毒性的预测指标，因此也是PM对健康影响的预测指标。本研究在智利的两个城市（圣地亚哥和奇廉）使用二硫苏糖醇分析法评估了PM、PM和PM样本的OP。结果表明，不同城市、PM粒径组分和季节之间的OP存在差异。此外，OP与某些金属和气象变量密切相关。在奇廉的寒冷时期以及圣地亚哥的温暖时期观察到较高的质量归一化OP，且与PM和PM相关。另一方面，两个城市在冬季以及对于PM而言，体积归一化OP较高。此外，我们将OP值与空气质量指数（AQI）尺度进行了比较，发现空气质量被归类为“良好”（本应被认为对健康危害较小）的日子里，其OP值极高，与被归类为“不健康”的日子相似。基于这些结果，我们建议将OP用作PM质量浓度的补充指标，因为它包含了与PM特性和成分相关的重要新信息，有助于改进当前的空气质量管理工具。
