Surface adsorption of organoarsenic roxarsone and arsanilic acid on iron and aluminum oxides

Wan Ru Chen, Ching Hua Huang

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

Aromatic organoarsenicals roxarsone (ROX) and p-arsanilic acid (ASA) are common feed additives for livestock and could be released into the environment via animal manure and agricultural runoff. To evaluate their environmental fate, the adsorption behavior of ROX and ASA was investigated with two common soil metal oxides, goethite (FeOOH) and aluminum oxide (Al 2O 3), under different reactant loading, water pH and competing ion conditions. ROX and ASA exhibit essentially identical adsorption characteristics. FeOOH and Al 2O 3 exhibit similar adsorption trends for both organoarsenicals; however, the adsorption efficiency on the surface site basis was about three times lower for Al 2O 3 than for FeOOH. The adsorption reaction is favorable at neutral and acidic pH. Phosphate and natural organic matter significantly interfere with aromatic arsenical adsorption on both metal oxides, whereas sulfate and nitrate do not. Pre-adsorbed aromatic arsenicals can be quickly but not completely displaced by phosphate, indicating that ion exchange is not the only mechanism governing the adsorption process. The adsorption envelope was successfully modeled by a diffuse double layer surface complexation model, identifying the critical role of di-anionic organoarsenic species in the adsorption. Results of this research can help predict and control the mobility of aromatic arsenicals in the environment.

Original languageEnglish
Pages (from-to)378-385
Number of pages8
JournalJournal of Hazardous Materials
Volume227-228
DOIs
Publication statusPublished - 2012 Aug 15

Fingerprint

Roxarsone
Arsanilic Acid
Aluminum Oxide
aluminum oxide
iron oxide
Adsorption
Iron
adsorption
Aluminum
Oxides
Acids
acid
Arsenicals
Phosphates
Agricultural runoff
Metals
phosphate
ferric oxide
agricultural runoff
Manure

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

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abstract = "Aromatic organoarsenicals roxarsone (ROX) and p-arsanilic acid (ASA) are common feed additives for livestock and could be released into the environment via animal manure and agricultural runoff. To evaluate their environmental fate, the adsorption behavior of ROX and ASA was investigated with two common soil metal oxides, goethite (FeOOH) and aluminum oxide (Al 2O 3), under different reactant loading, water pH and competing ion conditions. ROX and ASA exhibit essentially identical adsorption characteristics. FeOOH and Al 2O 3 exhibit similar adsorption trends for both organoarsenicals; however, the adsorption efficiency on the surface site basis was about three times lower for Al 2O 3 than for FeOOH. The adsorption reaction is favorable at neutral and acidic pH. Phosphate and natural organic matter significantly interfere with aromatic arsenical adsorption on both metal oxides, whereas sulfate and nitrate do not. Pre-adsorbed aromatic arsenicals can be quickly but not completely displaced by phosphate, indicating that ion exchange is not the only mechanism governing the adsorption process. The adsorption envelope was successfully modeled by a diffuse double layer surface complexation model, identifying the critical role of di-anionic organoarsenic species in the adsorption. Results of this research can help predict and control the mobility of aromatic arsenicals in the environment.",
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Surface adsorption of organoarsenic roxarsone and arsanilic acid on iron and aluminum oxides. / Chen, Wan Ru; Huang, Ching Hua.

In: Journal of Hazardous Materials, Vol. 227-228, 15.08.2012, p. 378-385.

Research output: Contribution to journalArticle

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