Hydrochemistry and stable isotopes (18O and 2H) characteristics of groundwater in Lokoja and its environs, central Nigeria
Autor: | Moshood N. Tijani, Rufai Ayuba, Daniel D. Snow |
---|---|
Rok vydání: | 2019 |
Předmět: |
Global and Planetary Change
Irrigation Ion exchange δ18O Stable isotope ratio 0208 environmental biotechnology Soil Science Geology Weathering 02 engineering and technology Groundwater recharge 010501 environmental sciences 01 natural sciences Pollution 020801 environmental engineering Environmental chemistry Silicate minerals Environmental Chemistry Groundwater 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology |
Zdroj: | Environmental Earth Sciences. 78 |
ISSN: | 1866-6299 1866-6280 |
DOI: | 10.1007/s12665-019-8582-8 |
Popis: | To determine hydrochemical and stable isotope characteristics of groundwater in Lokoja and its environs, 39 samples were collected, analyzed and interpreted. The results of the analyses revealed that pH of the water samples of the area ranged from 5.9 to 8.4 indicating neutral water except few slightly acidic samples. TDS varied between 44 and 1273 mg/L but were generally Ca2+ > Mg2+ > K+ with average values of 48.5 mg/L, 29.4 mg/L, 15.3 mg/L and 13.0 mg/L, respectively; while that of anions are HCO3− > Cl− > SO42− > NO3− with average values of 143.3 mg/L, 59.5 mg/L, 35.8 mg/L and 18.3 mg/L, respectively. Groundwater is generally suitable for drinking purposes as most samples fell within the “excellent water” and “good water” categories, while the quality for irrigation ranged from suitable to unsuitable. Five hydrochemical facies were determined: CaHCO3, mixed CaMgCl, NaCl, CaNaHCO3 and NaHCO3 water types. Several processes such as reverse ion exchange, weathering of silicate minerals and rock–water interactions were main mechanisms controlling ionic constituents of groundwater of the study area. In addition, the results of stable isotopes analyses showed considerable variations, ranging between − 3.9 and − 1.2% with an average of − 2.7% for δ18O and − 23.9% and 11.7% with a mean of 16.9% for δ2H. The plot of δ2H vs δ18O of groundwater system in the study area along global meteoritic water line indicated recent meteoritic recharge. However, all of the samples plotted deviated appreciable from global MWL except a sample from sandstone bedrock that was plotted along the line as defined by this equation: δ D = 8 δ 18O + 10. The deviation was a consequence of kinetic evaporative effect as well as rock–water interaction and carbondioxide exchange effects. |
Databáze: | OpenAIRE |
Externí odkaz: |
načítá se...