HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Makris, K. C. Articles by Datta, R. Search for Related Content PubMed Articles by Makris, K. C. Articles by Datta, R. Agricola Articles by Makris, K. C. Articles by Datta, R. Related Collections Mixed Wastes Remediation Organic Compounds Ground Water Quality

TECHNICAL REPORTS

Waste Management

Controlling the Fate of Roxarsone and Inorganic Arsenic in Poultry Litter

^a Environmental Geochemistry Lab., Univ. of Texas at San Antonio, TX 78249
^b Dep. of Chemistry, Univ. of Texas at San Antonio, TX, 78249

^* Corresponding author (konstantinos.makris{at}utsa.edu).

Received for publication August 6, 2007. A growing body of literature reports 3-nitro-4-hydroxyphenylarsonic acid (roxarsone) degradation in poultry litter (PL) to the more toxic inorganic arsenic (As). Aluminum-based drinking-water treatment residuals (WTR) present a low-cost amendment technology to reduce As availability in PL, similar to the use of alum to reduce phosphorus availability. Batch experiments investigated the effectiveness of WTR in removing roxarsone and inorganic As species from PL aqueous suspensions. Incubation experiments with WTR-amended PL evaluated the effects of WTR application rates (2.5–15% by weight) and incubation time (up to 32 d) at two incubation temperatures (23 and 35°C) on As availability in PL. Batch PL aqueous experiments showed the high affinity of As(V), As(III), dimethylarsinic acid (DMA), monomethylarsonic acid (MMA), and roxarsone for the WTR. The 10% WTR amendment rate decreased As availability in PL by half of that of the unamended (no WTR) PL-incubated samples. The reduction in dissolved As concentrations during incubation of WTR-amended PL samples was kinetically limited, being complete within 13 d. Parallel reductions in roxarsone, As(V), and DMA concentrations were observed with liquid chromatography–inductively coupled plasma mass spectrometry, whereas As(III) and MMA concentrations were always <5% of dissolved As. Incubation temperature did not significantly (p > 0.05) influence dissolved As concentrations in the WTR-amended PL. Potential formation of a copper-containing roxarsone metabolite was considered in PL aqueous suspensions with the aid of electrospray mass spectrometry. Further experiments in the field are necessary to ensure that sorbed As is stable in WTR-amended PL.

Abbreviations: CID, collision-induced dissociation • d-H₂O, deionized H₂O • DMA, dimethylarsinic acid • ES-MS, electrospray ionization mass spectrometry • GFAAS, graphite furnace atomic absorption spectroscopy • LC-ICPMS, liquid chromatography–inductively coupled plasma mass spectrometry • MMA, monomethylarsonic acid • PL, poultry litter • WTR, water-treatment residuals