Dataset on the spatial distribution of groundwater quality for pH, EC, TH, Ca2+, Mg2+, HCO3- . F-, and NO3- and in Dodoma, Singida, and Tabora regions located in central Tanzania

Published: 16 March 2023| Version 2 | DOI: 10.17632/4j8npwgvmv.2


A total of 64 water samples were collected in all. 22 samples from Dodoma and Singida and 20 samples from Tabora. All samples were collected from boreholes that are publicly accessible. Data collection covered a total distance of 1,344 km, which was divided into east-west along B129, B6, and B143 roads and north-south along A104, B141, and B6 roads. GPS coordinates of sample collection sites were recorded using a Garmin Nuvi 255w GPS receiver. All samples were collected within a three-day period in the month of August of 2020. pH, temperature, and EC were measured on site. The levels of TH, HCO3-, NO3-, and F- were determined within 24 hours of sample collection. The samples were kept in a 1 L polythene plastic bottle washed with distilled and sample. This dataset shows the parameters of pH, EC, TH, Ca2+, Mg2+, HCO3- NO3-, F-, and NO3-


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pH and EC measurements were done using a pH meter from Hanna Instruments (HI98130). The phenol disulfonic method and Cary 60 Uv-Vis spectrophotometer from Agilent Technologies were used to determine the concentration of NO3-. Determination of F- was done using a The SPADNS method and Hach DR900 Handheld Colorimeter (DR/890 Colorimeter). TH and HCO3- were determined using titration methods. TH as CaCO3 was determined using EDTA and Eriochrome Black T (EBT) indicator. HCO3- was determined using 0.05 M of H2SO4 and POP (Phenolphthalein) followed by MO (Methyl orange) indicators.