The Mexican Caribbean contributes significantly to Mexico's gross national product. The number of tourists declined from 16.7 million in 2019 to 8.8 million in 2020 due to the COVID-19 pandemic, with a rapid recovery of 13.5 million in 2021. Wastewater discharge is the primary contamination source associated with the tourism sector's demand for goods and services. Water quality could improve due to fewer tourists arriving during the COVID-19 sanitary emergency. This study aimed to quantify ammonium concentrations at eleven locations to evaluate water quality during the sanitary restriction due to the pandemic in the Mexican Caribbean. The ammonium concentrations were 85 % (Nov-2019), 89 % (Feb-2020), and 86 % (Feb-2021) higher than in Nov-2020, where six of the eleven sampled stations were below the detection limit (0.15 μM). Lower ammonium concentrations coincide with the sanitary restriction period and a decrease in affluent tourists.

中文翻译：

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墨西哥加勒比地区与 COVID-19 大流行相关的铵消耗

墨西哥加勒比地区对墨西哥国民生产总值的贡献巨大。由于COVID-19大流行，游客人数从2019年的1670万人次下降至2020年的880万人次，2021年迅速恢复至1350万人次。废水排放是与旅游业对商品和服务的需求相关的主要污染源。由于新冠肺炎 (COVID-19) 卫生紧急情况期间抵达的游客减少，水质可能会有所改善。本研究旨在量化 11 个地点的铵浓度，以评估墨西哥加勒比地区因疫情而实施卫生限制期间的水质。铵浓度比 2020 年 11 月高出 85%（2019 年 11 月）、89%（2020 年 2 月）和 86%（2021 年 2 月），其中 11 个采样站中有 6 个低于检测限（0.15 μM） ）。较低的铵浓度与卫生限制期和富裕游客的减少同时发生。