PROPOSAL GROUNDWATER QUALITY INDEX FOR IRRIGATION IN RURAL LAND, EASTERN AMAZON, BRAZIL
Proposição do índice de qualidade da água subterrânea Para irrigação em ambiente rural, amazônia oriental, Brasil
DOI:
https://doi.org/10.6008/CBPC2179-6858.2022.007.0013Keywords:
Agriculture, heavy metals, salinity, water qualityAbstract
The research proposes the implementation of the Water Quality Index for Irrigation from an underground source, in order to assess the quality of the Apéu River microbasin in rural areas. 88 water samples were collected from September 2018 to August 2019 in a rural area of the municipality of Castanhal-PA. To assess water quality, SAR and EC were used with a reference value corresponding to 0.7 dS m-1. The physicochemical variables evaluated were pH, DO, TDS, EC, SAL, and the metals Al, Fe, Ba, K, Ca, Mg, Na, Zn. Furthermore, the WQI for irrigation was determined through an equation that relates the standardized value of the variable analyzed with the number of characteristics assessed, where the proposed method of IWQI allowed to satisfactorily classifying the quality of water for irrigation. Although different waters qualities was observed, the predominance was of excellent quality.
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