Arsenic stability in contaminated soils

Journal Article · Thu Jan 01 04:00:00 EST 1976 · Soil Sci. Soc. Am. J.; (United States)

DOI:https://doi.org/10.2136/sssaj1976.03615995004000060017x· OSTI ID:7110323

Hess, R E; Blanchar, R W

Various Al, Ca, Fe, Mn, and Pb arsenate compounds were formed and their solubility products determined. The amount of arsenate in solution for each of the compounds could be predicted as follows: AlAsO/sub 4/ . 2H/sub 2/O(pAsO/sub 4/ = 24.51--3pH), FeAsO/sub 4/ . 2H/sub 2/O or Fe(OH)/sub 3/ . FeAsO/sub 4/(pAsO/sub 4/ = 26.07--3pH), Ca/sub 3/(AsO/sub 4/)/sub 2/ . 14H/sub 2/O(pAsO/sub 4/ = 9.29--1.5pCa), Pb/sub 3/(AsO/sub 4/)/sub 2/ . 4H/sub 2/O(pAsO/sub 4/ = 19.75--1.5pPb), and Mn/sub 3/(AsO/sub 4/)/sub 2/(pAsO/sub 4/ = 35.6--12.8Eh--2.3pH), or (pAsO/sub 4/ = 47.3--25.3Eh--3pH), with either Mn/sub 2/O/sub 3/ or MnO/sub 2/. Samples from Sharpsburg and Menfro soils were equilibrated for 7 days at 25/sup 0/C with dilute HCl and NaOH. Aluminum, Fe, Ca, Mn, Pb, and As contents and pH and E (platinum) were determined on the solution portions. The values of pAl + 3pOH, pAl + pAsO/sub 4/, pFe + 3pOH, pFe + pAsO/sub 4/, 3pCa + 2pAsO/sub 4/, 3pMn + 2pAsO/sub 4/, and 3pPb + 2pAsO/sub 4/ were computed for each soil. The values of the ion products indicated that equilibrium solutions from both soils were undersaturated with respect to Al, Fe, and Ca and that Pb and Mn arsenate were stable in the Menfro and Sharpsburg soils.

• Research Organization: Univ. of California, Riverside
• OSTI ID: 7110323
• Journal Information: Soil Sci. Soc. Am. J.; (United States), Journal Name: Soil Sci. Soc. Am. J.; (United States) Vol. 40:6; ISSN SSSJD
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALKALINE EARTH METALS
ALUMINIUM
ARSENATES
ARSENIC
ARSENIC COMPOUNDS
CALCIUM
CHALCOGENIDES
CHARGED PARTICLES
ELEMENTS
IONS
IRON
LAND POLLUTION
LEAD
MANGANESE
MANGANESE COMPOUNDS
MANGANESE OXIDES
METALS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
POLLUTION
SEMIMETALS
SOILS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS