Arid and semi-arid cities are of especial interest due to the high amount of dusts that are deposited daily. Dust particles contain heavy metals that are considered potentially toxic elements (PTEs). High concentrations of PTEs in dust particles can result in risks to human health. Few studies have documented accumulation rates of atmospheric deposition and the influence of the North American Monsoon (NAM) in the movement of PTEs. Precipitation and urban runoff derived from the NAM play an important role in the deposition and resuspension of PTEs on urban surfaces. In this work, we quantified spatial and temporal patterns of Zn, Pb and Cu in an urban-rural gradient using ion-exchange resin (IER) collectors. Three monitoring periods were chosen and the samplings were carried out during the dry and rainy season in a city influenced by the NAM. Results from the IER collectors during the first monitoring period estimated 4.6 gZnha 15 wk, 3.3 gPbha15 wk and 3.7 gCuha15 wk. During the second period, the deposition rates were 5.6 gZnha 37 wk, 1.1 gPbha 37 wk and 1.5 gCuha 37 wk. Finally, in the third period 7.0 gZn ha17 wk, 0.6 gPbha 17 wk and 0.9 gCuha 17 wk were found. The central area of the city exhibited the highest deposition rates of PTEs influenced by precipitation and flood areas. Results of this work demonstrate the importance of the NAM in the movement of PTEs caused by precipitation and winds that promote the movement of particles in an urban area.

中文翻译：

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墨西哥西北部半干旱城市城市灰尘中锌、铅和铜的季节性定量

由于每天沉积的灰尘量很大，干旱和半干旱城市尤其受到关注。灰尘颗粒含有被视为潜在有毒元素 (PTE) 的重金属。灰尘颗粒中高浓度的 PTE 会对人体健康造成风险。很少有研究记录大气沉降的累积速率以及北美季风 (NAM) 对 PTE 运动的影响。NAM 产生的降水和城市径流对于 PTE 在城市表面的沉积和再悬浮发挥着重要作用。在这项工作中，我们使用离子交换树脂 (IER) 收集器量化了城乡梯度中 Zn、Pb 和 Cu 的空间和时间模式。选择了三个监测周期，并在受NAM影响的城市的旱季和雨季进行了采样。IER 收集者在第一个监测期间的结果估计为 15 周 4.6 gZnha、15 周 3.3 gPbha 和 15 周 3.7 gCuha。在第二阶段，沉积速率为5.6 gZnha 37 wk、1.1 gPbha 37 wk 和1.5 gCuha 37 wk。最后，在第三阶段发现了 7.0 gZn ha17 wk、0.6 gPbha 17 wk 和 0.9 gCuha 17 wk。受降水和洪涝区影响，城市中心区PTE沉积率最高。这项工作的结果证明了 NAM 在由降水和风引起的 PTE 移动中的重要性，这些 PTE 会促进城市地区颗粒物的移动。