Skip to main content
Log in

A study on geochemistry and sources of colloidal fractions in coastal groundwater from different lithologies

  • Published:
Journal of Earth System Science Aims and scope Submit manuscript

Abstract

The study on colloids in groundwater has been gaining great importance in addressing contamination transport. The objective of this study is to determine the size and nature of groundwater colloids and its association with heavy metals. Groundwater samples were collected from two bore wells representing hard rock and sedimentary aquifers in the coastal region during post- and pre-monsoon seasons. The colloids of 1.2, 0.8, 0.45 and 0.22 µm sizes were studied from these samples for mineral assemblages, geochemistry and metals such as Zn, Fe, Mn, Ni, Cu, Cr and Co. The mineral assemblage was studied by X-ray diffraction and the results show predominance of kaolinite in clayey sand formation, in all size fractions. The dominance of muscovite and illite also was observed in larger fractions obtained from the groundwater of charnockite formation. The X-ray fluorescence results of the colloidal fractions show most of the clays have higher SiO2 and lower Al2O3 values. Few size fractions were noted to have a high content of Fe2O3 and MgO indicating the dominant source basic rock compositions. The larger fraction (1.2 µm size) indicated the muscovite, 0.8 µm size fraction showed chlorite composition and the smaller colloidal fractions (0.8 and 0.22 µm) reflected illite composition in the hard rock terrain. However, all the size fractions showed the predominance of kaolinite composition in the groundwater samples collected from sedimentary formation irrespective of the season. The heavy metal analysis result shows that the Fe and Mn were predominant in all the size fractions of both locations and in both seasons. Cr and Co were higher in larger fractions of both locations. In general, it is observed that the sedimentary formation well has higher heavy metal concentration except Co. Hence, the study proves that the metal concentrations present in finer size fraction of colloids also contribute to the transport of contaminants.

Highlights

  • Lithology plays a major role in groundwater colloids chemistry in the coastal aquifer.

  • X-ray diffraction (XRD) and x-ray fluorescence (XRF) results resemble the variation of minerals predominance in different size fractions of groundwater colloids.

  • The heavy metal association with groundwater colloids also vary with respect to different colloidal fractions.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17

Similar content being viewed by others

References

Download references

Author information

Authors and Affiliations

Authors

Contributions

Pradeep Kamaraj and Chidambaram Sabarathinam had conceived the presented idea and decided the structure of this paper. H Seshadhri, Banajarani Panda and Ganesh Nagappan have encouraged this specific aspect and supported sample preparation and the analysis part. Pradeep Kamaraj, Chidambaram Sabarathinam and Banajarani Panda have written the manuscript. Brindha Karthikeyan, Prasanna Mohan Viswanathan and Ramesh Govindaraj reviewed this paper and gave their valuable corrections and suggestions. Pradeep Kamaraj and Chidambaram Sabarathinam carried out all the corrections.

Corresponding author

Correspondence to Pradeep Kamaraj.

Additional information

Communicated by Abhijit Mukherjee

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Kamaraj, P., Sabarathinam, C., Seshadri, H. et al. A study on geochemistry and sources of colloidal fractions in coastal groundwater from different lithologies. J Earth Syst Sci 131, 62 (2022). https://doi.org/10.1007/s12040-022-01812-5

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s12040-022-01812-5

Keywords

Navigation