Species and potential sources of phosphorus in groundwater in and around Mataram City, Lombok Island, Indonesia

Seiichiro Ioka, Shin ichi Onodera, Mitsuyo Saito, Anna Rusydi, Hendra Bakti, Sachi A. Wakasa

Research output: Contribution to journalArticlepeer-review

Abstract

Geochemical evaluation of the species and potential sources of P in groundwater in and around Mataram City, Lombok Island, Indonesia can aid in the initial research on evaluating the fate of P when detailed geological information is unavailable. The results of ion chromatography and inductively coupled plasma-optical emission spectroscopy show that the concentrations of PO43– and total dissolved P (TDP) in groundwater range from approximately 0.1 to 8.5 mg l–1 and from 0.04 to 2.95 mg l–1, respectively. Dissolved inorganic P accounted for 86%, on average, of the TDP concentration, and PO43– represented the predominant P species in this groundwater. The potential sources for most of this dissolved PO43–, according to indices developed based on the PHREEQC software and groundwater quality data, could be the dissolution of hydroxyapatite and/or vivianite minerals. However, the potential sources of dissolved PO43– in groundwater with a TDP concentration of ≥ 1 mg l–1 is likely to be the reduction of Fe(III)–(hydro)oxides, the initial decomposition of organic matter, or the dissolution of carbonate-rich fluorapatite considering the Fe2+, dissolved organic carbon, Ca2+ and F concentrations measured. In addition, as several groundwater samples had a TDP concentration of ≤ 1 mg l–1 and comparatively high concentration of NO3, other potential sources of dissolved PO43– in this groundwater could be anthropogenic.

Original languageEnglish
Article number27
JournalSN Applied Sciences
Volume3
Issue number1
DOIs
Publication statusPublished - Jan 2021

Keywords

  • Geochemical analysis
  • Groundwater
  • Indonesia
  • Phosphorus

ASJC Scopus subject areas

  • Engineering(all)
  • Environmental Science(all)
  • Materials Science(all)
  • Physics and Astronomy(all)
  • Chemical Engineering(all)
  • Earth and Planetary Sciences(all)

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