Co-occurence and potential chemical competition of phosphorus and silicon in lake sediment

Helinä Hartikainen (Corresponding Author), Marja Pitkänen, Timo Kairesalo, Liisa Tuominen

Research output: Contribution to journalArticleScientificpeer-review

52 Citations (Scopus)

Abstract

Various chemical approaches were used to characterize P and Si in the surface sediment of Lake Vesijärvi, Southern Finland. The dynamic equilibrium between solid and solution P in aerobic and anaerobic sediment was investigated by means of desorption-sorption isotherms. The sediment material was rich in hydrated Al and Fe oxides and, accordingly, had a high P sorption capacity and a very low P concentration (5 μg l−1) in the interstitial water under aerobic conditions. Approximately 25–30% of total P and almost 90% of total Si were bound in mineral lattices, i.e. in a stable form not participating in biological and chemical transformations. Organic P comprised about 20–25% of total P and was mainly in practically insoluble form not extractable by dilute base or acid. Phosphorus participating in sorption-desorption reactions was considered to originate from reserves bound on oxide surfaces. When the oxide bound P reserves were determined by fractionation analysis, a large amount of Si (corresponding to about 30% of biogenic reserves) was also dissolved. Anaerobiosis increased distinctly the occurrence of both elements in the interstitial water. These dissolution patterns suggest that P and Si are bound to the same components and, therefore, compete with each other for the sorption sites. This chemical competition, in turn, may be of importance in the nutrient exchange between solid and solution phase in sediment.
Original languageEnglish
Pages (from-to)2472-2478
Number of pages7
JournalWater Research
Volume30
Issue number10
DOIs
Publication statusPublished - 1996
MoE publication typeNot Eligible

Fingerprint

Chemical potential
silicon
Lakes
lacustrine deposit
Phosphorus
Sorption
Sediments
sorption
phosphorus
Silicon
oxide
Oxides
Desorption
desorption
porewater
sediment
oxic sediment
anaerobiosis
anoxic sediment
Fractionation

Keywords

  • sedimentary phosphorus
  • sedimentary silicon
  • fractionation analysis
  • biogenic silicon
  • phosphorus sorption

Cite this

Hartikainen, Helinä ; Pitkänen, Marja ; Kairesalo, Timo ; Tuominen, Liisa . / Co-occurence and potential chemical competition of phosphorus and silicon in lake sediment. In: Water Research. 1996 ; Vol. 30, No. 10. pp. 2472-2478.
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Co-occurence and potential chemical competition of phosphorus and silicon in lake sediment. / Hartikainen, Helinä (Corresponding Author); Pitkänen, Marja; Kairesalo, Timo; Tuominen, Liisa .

In: Water Research, Vol. 30, No. 10, 1996, p. 2472-2478.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Co-occurence and potential chemical competition of phosphorus and silicon in lake sediment

AU - Hartikainen, Helinä

AU - Pitkänen, Marja

AU - Kairesalo, Timo

AU - Tuominen, Liisa

PY - 1996

Y1 - 1996

N2 - Various chemical approaches were used to characterize P and Si in the surface sediment of Lake Vesijärvi, Southern Finland. The dynamic equilibrium between solid and solution P in aerobic and anaerobic sediment was investigated by means of desorption-sorption isotherms. The sediment material was rich in hydrated Al and Fe oxides and, accordingly, had a high P sorption capacity and a very low P concentration (5 μg l−1) in the interstitial water under aerobic conditions. Approximately 25–30% of total P and almost 90% of total Si were bound in mineral lattices, i.e. in a stable form not participating in biological and chemical transformations. Organic P comprised about 20–25% of total P and was mainly in practically insoluble form not extractable by dilute base or acid. Phosphorus participating in sorption-desorption reactions was considered to originate from reserves bound on oxide surfaces. When the oxide bound P reserves were determined by fractionation analysis, a large amount of Si (corresponding to about 30% of biogenic reserves) was also dissolved. Anaerobiosis increased distinctly the occurrence of both elements in the interstitial water. These dissolution patterns suggest that P and Si are bound to the same components and, therefore, compete with each other for the sorption sites. This chemical competition, in turn, may be of importance in the nutrient exchange between solid and solution phase in sediment.

AB - Various chemical approaches were used to characterize P and Si in the surface sediment of Lake Vesijärvi, Southern Finland. The dynamic equilibrium between solid and solution P in aerobic and anaerobic sediment was investigated by means of desorption-sorption isotherms. The sediment material was rich in hydrated Al and Fe oxides and, accordingly, had a high P sorption capacity and a very low P concentration (5 μg l−1) in the interstitial water under aerobic conditions. Approximately 25–30% of total P and almost 90% of total Si were bound in mineral lattices, i.e. in a stable form not participating in biological and chemical transformations. Organic P comprised about 20–25% of total P and was mainly in practically insoluble form not extractable by dilute base or acid. Phosphorus participating in sorption-desorption reactions was considered to originate from reserves bound on oxide surfaces. When the oxide bound P reserves were determined by fractionation analysis, a large amount of Si (corresponding to about 30% of biogenic reserves) was also dissolved. Anaerobiosis increased distinctly the occurrence of both elements in the interstitial water. These dissolution patterns suggest that P and Si are bound to the same components and, therefore, compete with each other for the sorption sites. This chemical competition, in turn, may be of importance in the nutrient exchange between solid and solution phase in sediment.

KW - sedimentary phosphorus

KW - sedimentary silicon

KW - fractionation analysis

KW - biogenic silicon

KW - phosphorus sorption

U2 - 10.1016/0043-1354(96)00139-X

DO - 10.1016/0043-1354(96)00139-X

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JO - Water Research

JF - Water Research

SN - 0043-1354

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