Analysis of the water quality of Mirim Lagoon through WQI and statistical methods
DOI:
https://doi.org/10.6008/CBPC2179-6858.2021.001.0031Keywords:
Mirim Lagoon, Water quality, Statistical analysis, ANOVA, CorrelationAbstract
Over the years there has been a worrying increase in the degradation of water resources all around the world. In this scenario, created in the USA by the NSF, WQI emerges, as one of the methods used for water quality monitoring, using variables that reflect the changes occurred in the basin region, natural or anthropic. Other methods that can be used for water monitoring are the statistical ones, capable of providing simple interpretations from the analysis of complex data. The present work then sought to analyze the water quality of Lagoa Mirim by calculating the WQI and statistical methods, such as variance and correlation. For this, 9 parameters were analyzed for samples collected at 7 monitoring points in 2015, 2016 and 2017. The results showed the correlation between the monitoring parameters, as well as the correlation of these parameters with the WQI, showing their relevance to the water quality of Mirim Lagoon. As for the IQA, the studied water resource was generally within the acceptable range. When analyzing the variations in the parameters and the IQA considering the monitored months and years as a factor, it can be concluded that these variations occur significantly between these observation factors. This conclusion can be corroborated by the fact that there are many climatic factors that can influence water quality, as well as factors related to agricultural activities in the vicinity of Lagoa Mirim that also have an impact on this water body.
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