Electro-migration of nitrate in sandy soil

Naglaa Eid, Walid Elshorbagy, Dennis Larson, Donald C Slack

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Migration of nitrate to groundwater has become a serious threat in many agricultural areas. This paper presents the results of experimental laboratory tests studying the nitrate gradient developed in response to an electrical potential. Two systems were tested; the first had no flow (closed system) and the second had flow opposite to the direction of the electrical current. A solution of sodium nitrate in sandy soil was used in both systems. The tests showed that the electro-kinetic process effectively concentrated and retained nitrate close to the anode. The movement of NO3/- through the soil column was significantly influenced by the development of a pH gradient. Statistical analysis was performed to determine best-fit equations relating the nitrate gradient to the electrical input and pH gradient. A simple one-dimensional finite difference model was used to predict the pH gradient developed during the electro-kinetic process. The experimental measurements closely agreed with the predicted spatial and temporal distribution of the nitrate gradient for both closed and open system configurations. (C) 2000 Elsevier Science B.V.

Original languageEnglish (US)
Pages (from-to)133-149
Number of pages17
JournalJournal of Hazardous Materials
Volume79
Issue number1-2
DOIs
StatePublished - Dec 1 2000

Fingerprint

Electromigration
Nitrates
sandy soil
Soil
Proton-Motive Force
nitrate
Soils
Kinetics
Open systems
Groundwater
kinetics
soil column
Statistical methods
Anodes
Electrodes
temporal distribution
statistical analysis
agricultural land
Sodium
sodium

Keywords

  • Electro-kinetics
  • Electro-migration
  • Nitrate migration
  • pH gradient

ASJC Scopus subject areas

  • Chemical Health and Safety
  • Process Chemistry and Technology
  • Safety, Risk, Reliability and Quality
  • Environmental Engineering

Cite this

Electro-migration of nitrate in sandy soil. / Eid, Naglaa; Elshorbagy, Walid; Larson, Dennis; Slack, Donald C.

In: Journal of Hazardous Materials, Vol. 79, No. 1-2, 01.12.2000, p. 133-149.

Research output: Contribution to journalArticle

Eid, Naglaa ; Elshorbagy, Walid ; Larson, Dennis ; Slack, Donald C. / Electro-migration of nitrate in sandy soil. In: Journal of Hazardous Materials. 2000 ; Vol. 79, No. 1-2. pp. 133-149.
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