Geospatial Groundwater Quality Assessment and Identification of Polluted Risky Regions in Jamui District of Bihar with Special Reference to Uranium and Fluoride Concentration
Subhash Prasad Singh1*
and Palash Kumar Dutta1
http://dx.doi.org/10.12944/CWE.15.3.30
Groundwater Quality; Radiological Parameter; Risky Regions; Spatial Pollution
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Singh S. P, Dutta P. K. Geospatial Groundwater Quality Assessment and Identification of Polluted Risky Regions in Jamui District of Bihar with Special Reference to Uranium and Fluoride Concentration. Curr World Environ 2020;15(3).
DOI:http://dx.doi.org/10.12944/CWE.15.3.30Copy the following to cite this URL:
Singh S. P, Dutta P. K. Geospatial Groundwater Quality Assessment and Identification of Polluted Risky Regions in Jamui District of Bihar with Special Reference to Uranium and Fluoride Concentration. Curr World Environ 2020;15(3). Available From:https://bit.ly/2HtUkhC
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Groundwater地球表面的水存在下订单吗re spaces of the sediments and in the fracture of rock formation. Precipitation infiltrates below the ground surface into the aquifers causing groundwater. Water percolates downward after having saturated soil zone.Rain can cause the water table to rise whereas continuous extraction of ground water can cause the level to fall.Since groundwater is part of the hydrologic cycle, contaminants in other parts of the cycle, such as the atmosphere or bodies of surface water, can eventually be transferred into our groundwater supplies. Pollutants released to the ground due to surface activities such as ill agricultural practices, domestic / industrial waste disposal, mining, etc. and making their way down into underground water specially in shallow aquifers particularly in the permeable unconsolidated deposits cause groundwater contamination1.
Drinking contaminated groundwater can have serious health effects.Approximately one third of the world’s population use groundwater for drinking2. More than 80% of India’s population depends on groundwater for drinking and irrigation purposes. About 22% groundwater in India is either dried up or in the overexploited or critical categories as per the report of ‘Dynamic Ground Water Resources of India3.’A decrease in availability and quality of fresh water and a significant increase in demand for groundwater cause problems related to environmental sustainability4,5. The impacts of anthropogenic activities, the interaction of surface water and groundwater, rock water interaction and over-extraction of groundwater lead to deterioration of water quality6for drinking purposes in term of physical, chemical and radiological characteristics. A lot of attention has been drawn in the past in Jamui district due to fluoride contamination in ground water and its toxicity in human body7. There are various pathways of fluoride to enter in the groundwater8out of which interaction of fluoride containing mineral with aquifer water is the prominent one. The fluoride hazard mainly includes dental fluorosis or skeletal or non-skeletal fluorosis resulted from excess exposure9. A naturally occurring radionuclideUraniumis increasingly becoming a concern for people on the globethese days for its radioactivity, toxicity and its carcinogenic potency10-15.It is found in all matrices of environment such as rocks, soil, air, surface / underground water, in fauna and flora in varying amounts. Uranium contaminant in water is either geogenic or man-made16. It can find its way into drinking water when groundwater or rainwater dissolves mineral that contains uranium17,18.Access to safe drinking water has become a challenge in developing countries in the context of growing population and increasing water contamination18-25.
Groundwater pollution potential in the study zone has been assessed by means ofproper data analysis ofwater quality parameters such as pH, TDS, conductance, DO, ORP, salinity, alkalinity, hardness, calcium, magnesium, iron, uranium, carbonate, bicarbonate, fluoride, chloride, sulphate, nitrate, phosphate, etc as per standard protocol. Recorded data from ongoing monitoring program, hydro geological and geographical information, published studies, and environmental impact assessments are the important factors for evaluation of water quality. The Fig.1 shows location of Jamui district26in Bihar (India).
 |
Figure 1:Location of Jamui district Click here to view figure |
Study area27
Material and Method
Sampling and Measurement of In-Situ Parameters
 |
Figure 2: Depth of Aquifer Click here to view figure |
pH, temperature, total dissolved solids (TDS), electrical conductivity (EC), dissolved oxygen (DO), salinity, oxidation reduction potential (ORP) etc. were measured using field instruments immediately after the sample was collected. One litre water sample was collected in a neck to neck filled bottle for analysis of U, F-, Cl-. NO3-, SO42-and PO43-. Duplicate acidified sample (1ml of Conc. HNO3for 500 ml of water) was also collected from each sampling site.
Sample Analysis in the laboratory
Major cations and anions were analyzed in the collected water samples at the chemistry lab of A N College, Patna. LED Fluorimeter LF-2a (Quantalase, Indore) was used to measure uranium concentration as per BARC Standard Protocol for National Uranium Project (NUP)29. Fluoride concentration was measured using Ion Selective method. SO42-, PO43-and NO3-, total hardness, total alkalinity and Cl-were analysed as per standard protocol for NUP29and APHA30.
Result
The descriptive statistical analysis of uranium and associated water quality parameter of groundwater in the study area during pre-monsoon and post-monsoon is shown in table-1.
Table 1: Descriptive statistical analysis of Uranium and associated water quality parameterParameters |
Pre-monsoon |
Post-monsoon |
BIS31limits (Desirable – Permissible) |
||||||
Min |
Max |
Average |
Median |
Min |
Max |
Average |
Median |
||
pH |
6.5 |
8.86 |
7.55 |
7.4 |
6.36 |
8.01 |
7.04 |
6.99 |
6.5 – 8.5 |
TDS (ppm) |
72 |
1134 |
393.67 |
324 |
91 |
1240 |
355.33 |
237 |
500ppm – 2000ppm |
EC (µS/cm) |
134 |
1985 |
724.29 |
603 |
162 |
2310 |
646.35 |
422 |
- |
Salinity (ppm) |
30 |
1130 |
391.813 |
320 |
100 |
1390 |
367.826 |
210 |
|
ORP (mV) |
-253 |
44 |
-32.11 |
-19 |
-44 |
40 |
5.52 |
7.0 |
- |
Temp. (oC) |
23.6 |
33 |
28.75 |
29 |
24.6 |
29.1 |
26.66 |
26.5 |
- |
DO (ppm) |
2.9 |
14.9 |
6.22 |
6.3 |
3.5 |
5.7 |
4.58 |
4.6 |
- |
F-(ppm) |
0.1 |
5.14 |
1.053 |
0.79 |
0.13 |
3.6 |
0.97 |
0.72 |
1ppm - 1.5ppm |
Cl-(ppm) |
7.09 |
255.24 |
46.01 |
28.36 |
10.64 |
287.15 |
65.81 |
39.0 |
250ppm – 1000ppm |
NO3-(ppm) |
0.5 |
12.3 |
4.53 |
4.2 |
0.5 |
8.90 |
3.68 |
3.90 |
45ppm – 100ppm |
SO42-(ppm) |
1.0 |
115.47 |
17.77 |
8.14 |
2.06 |
165.08 |
27.70 |
12.98 |
200ppm – 400ppm |
PO43-(ppm) |
0.1 |
2.01 |
0.15 |
0.1 |
0.33 |
0.74 |
0.41 |
0.37 |
- |
U (ppb) |
0.50 |
20.07 |
4.89 |
1.60 |
0.50 |
29.45 |
8.02 |
3.90 |
60 (AERB32) |
Total Hardness (ppm) |
30 |
615 |
221.32 |
185 |
45 |
695 |
204.56 |
140 |
300ppm-600ppm |
Ca Hardness (ppm) |
15 |
430 |
102.86 |
80 |
35 |
550 |
156.30 |
105 |
- |
Mg Hardness (ppm) |
10 |
480 |
118.46 |
95 |
10 |
145 |
48.26 |
40 |
- |
Total Alkalinity (ppm) |
5 |
110 |
41.26 |
35 |
10 |
105 |
46.74 |
40 |
200ppm – 600ppm |
Bicarbonate (mg of CaCO3) |
5 |
110 |
41.26 |
35 |
10 |
105 |
46.74 |
40 |
|
pH, EC, TDS, Salinity and ORP in the water samples were found to vary in the range of 6.5-8.86, 6.36-8.01; 134-1985µS/cm, 162-2310µS/cm; 72ppm-1134ppm, 91ppm-1240ppm; 30ppm-1130 ppm, 100ppm-1390ppm and -253mV to 44mV, -44mV to 40mV respectively during pre- and post- monsoon. The stated values fall almost within the permissible limit of BIS.
Distribution of fluoride concentration in water samples during pre- & post- monsoon is addressed by fig. 3 & fig.4
 |
Figure 3: Fluoride distribution (Pre-monsoon) Click here to view figure |
 |
Figure 4: Fluoride distribution (Post-monsoon) Click here to view figure |
氟浓度变化在0.1便士pm-5.14ppm with the median value of 0.79ppm and 0.13ppm-3.6ppm with the median value of 0.72ppm during pre- & post-monsoon respectively. The values of fluoride concentration exceed the permissible limit of BIS and WHO33in some of the analyzed samples
 |
Figure 5: Distribution of Uranium (Pre-monsoon) Click here to view figure |
 |
Figure 6: Distribution of Uranium (Post-monsoon) Click here to view figure |
Thedistribution of Uranium during pre- & post monsoon is shown by fig.5 & fig.6. Uranium level in analyzed water samples varies in the range of <0.5-20.07ppb and <0.5-29.45ppb with a median value of 1.6ppb and 3.9ppb respectively in pre- & post-monsoon. Rest of the chemical parameters is found to be well within the permissible limit of BIS.
Discussion
Alkaline nature of groundwater was recorded irrespective of the aquifer sampled. The cations and anions dissolved are well within ±5% of normalized inorganic charge balance.Elevation of fluoride concentration in16.48% water samples during pre-monsoon and in 20.87% water samples during post-monsoonfrom aquifers of varying depth has been observed higher than WHO and BIS limits. It is indicative of water rock interaction. The sources of human exposure to the increased concentration of fluoride34-36in drinking water have drastically increased. In view of the cases of fluoride toxicity37, it is urgently needed to be addressed in the study area.
Spatial statistics was used to identify the uranium hotspot38in groundwater in the study area during pre- & post-monsoon as represented through fig.7 & fig.8. At some places as is evident from the figure, it is in borderline and need constant monitoring. Fluctuation of uranium concentration has been found in water samples from aquifers of different depth.
 |
Figure 7:Hot spot of uranium (pre- monsoon) Click here to view figure |
 |
Figure 8: Hot spot of uranium (post-monsoon) Click here to view figure |
Pearson correlation has been established among analyzed parameters during pre- and post-monsoon (table-2 & table-3).
 |
Table 2: Pearson correlation (Pre-monsoon) Click here to view table |
 |
Table 3: Pearson correlation (Post-monsoon) Click here to view table |
A positive correlation of fluoride with pH, total dissolved solid, electrical conductance, salinity, uranium and total alkalinity was observed39during pre-and post- monsoon. Strong correlation of uranium has been observed with TDS, EC, salinity, total hardness, total alkalinity, fluoride, chloride and sulphate. However, there is negligible correlation between uranium with phosphate. Likely, no correlation has been observed between fluoride and chloride.
Conclusion
Current finding involves the area where general water quality is found to be suitable but some important parameters such as pH and fluoride concentration exceeded the permissible limit of BIS and WHO at several places. Fluoride concentration in 16.48% water samples during pre-monsoon and in 20.87% water samples during post-monsoon were found higher than BIS and WHO acceptable limit of 1ppm-1.5ppm.Elevated fluoride level has been observed in varying aquifers of different depth which may be caused to water-rock interactions.It draws the attention of the authorities to supply de-fluoridated water to the residents for drinking purposes. However, uranium level in analyzed water samples were well within the safe standard limit of WHO, US EPA40and AERB along with other associated water quality parameters during pre- and post-.monsoon but at some places it is in borderline and need constant monitoring.这些结果可能为c提供有用的信息ontrol of groundwater pollution and its management in the study area with the time.是我的连续评估参数portant for future perspective and awareness41,42.Educating the users and defluorinating the groundwater before consumption are essentially importantfor the resident.43,44Implementation of rainwater harvesting schemes in the affected area may be a resilient and sustainable solution for dilution of elevated ionic concentration in water for drinking and irrigation purposes. Use of rainwater capture by check dams and other small system following simple treatment of coagulation, flocculation, filtration and chemical treatment may prove the ultimate economical solution for the fluoride menace in the study area based on the principal of “Prevention is better than cure” because of having good quality of surface water in the study zone.
Acknowlegdement
The authors are thankful to the residents of the study area for providing assistance in collecting the samples. The present work is a part of the research project funded by BRNS, DAE, Government of India, (GoI) vide NRFCC Letter no 36(4)/14/37/2015-BRNS/10046 dated 2nd May 2016. Hence, the financial support from the BRNS is acknowledged. Special thanks goes to Dr Ajay Kumar, Health Physics Division, BARC, Mumbai along with the member of TSC-4, NRFCC, BRNS, HPD, HS & E Group, BARC and NUP team members for their continual support.
Conflict of Interest
Author has no conflict of interest in this article.
Funding Sources
The author got no financial assistance from any government or non- government organization.
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