Laboratorio de Química Analítica, Facultad de Agronomía y Agroindustrias, Universidad Nacional de Santiago del Estero, Santiago del Estero, Argentina.
Departamento de Ciencias Analíticas, Facultad de Ciencias, Universidad Nacional de Educación a Distancia, Madrid, Spain.
Environ Pollut. 2018 May;236:265-272. doi: 10.1016/j.envpol.2018.01.062. Epub 2018 Feb 2.
Santiago del Estero is a province located in northwestern Argentina. The Dulce River is used for irrigation through a vast network of channels and ditches, including the San Martin Canal (SMC), which crosses the capital city of Santiago del Estero. This canal's water is used for drinking, as well as recreational use for the general population. However, this river has been seriously polluted for several decades. The present study focuses on the identification and the quantification of the water pollution levels of total phenols in the SMC according to the seasonal periods. Water samples from various areas of the canal in different months of the year, extending from December to September, were collected for analysis. Additionally, the concentration of total dissolved solids (TDS), chlorides, sulphates, nitrites and organic matter, as well as water hardness and alkalinity, were analysed in order to conduct a more complete study of the contamination of this area. The results showed a worrying total phenol concentration that exceeded the limit set by Argentine legislation for drinking water, as well as water for recreational use (5 μg/L). The total phenol (TP) concentration was directly determined by a molecular absorption spectroscopy method based on a new flow injection analysis system (FIA). Under the selected experimental conditions, the detection and quantification limits were 0.0490 and 0.1633 μg/mL, respectively. The developed method provides a number of improvements related to the speed of analysis, the restricted consumption of the reagents and sample volumes and the unnecessary sample treatment that contribute to environmentally friendly analytical chemistry. The results showed that TP make a significant contribution in the SMC pollution, especially during the months of April (400 ± 110 μg/L) and September (240 ± 20 μg/L). A high sulphate concentration that was higher than the limit allowed by the legislation was also found.
圣地亚哥-德尔埃斯特罗省位于阿根廷西北部。杜尔塞河（Dulce River）通过一个庞大的渠道和沟渠网络用于灌溉，其中包括穿过圣地亚哥-德尔埃斯特罗省会城市的圣马丁运河（SMC）。这条运河的水不仅用于饮用，也供大众休闲使用。然而，几十年来，这条河一直受到严重污染。本研究根据季节性时间段，重点关注 SMC 中总酚的水污染水平的识别和量化。在一年中的不同月份，从 12 月到 9 月，从运河的各个区域采集水样进行分析。此外，还分析了总溶解固体（TDS）、氯化物、硫酸盐、亚硝酸盐和有机物的浓度，以及水的硬度和碱度，以对该地区的污染进行更全面的研究。结果显示，总酚的浓度令人担忧，超过了阿根廷饮用水和休闲用水的规定限值（5μg/L）。总酚（TP）浓度是通过基于新的流动注射分析系统（FIA）的分子吸收光谱法直接测定的。在选定的实验条件下，检测限和定量限分别为 0.0490 和 0.1633μg/mL。所开发的方法在分析速度、试剂和样品体积的有限消耗以及不必要的样品处理方面提供了多项改进，有助于环保分析化学。结果表明，TP 对 SMC 的污染有很大的贡献，特别是在 4 月（400±110μg/L）和 9 月（240±20μg/L）。还发现硫酸盐浓度很高，超过了法规允许的限值。
