Heavy metal release from soils in batch pH{sub stat} experiments

Journal Article · Mon Mar 01 04:00:00 EST 1999 · Soil Science Society of America Journal

DOI:https://doi.org/10.2136/sssaj1999.03615995006300020006x· OSTI ID:678086

Schwarz, A; Wilcke, W; Zech, W ^[1]; Styk, J ^[2]

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1. Univ. of Bayreuth (Germany). Inst. of Soil Science and Soil Geography
2. Soil Fertility Research Inst., Banska Bystrica (Slovakia)

In Slovakia H{sup +} input into soils is increasing because alkaline dust emissions have been reduced since 1990. Their objectives were to examine (i) the metal release in H{sup +} buffer reactions of Slovak soils and (ii) the impact of the proton buffering on heavy metal partitioning. They used 10 soils (pH 7.4-3.6) in a batch pH{sub stat} experiment. Released ions were adsorbed to an ion-exchange resin, while pH was kept constant. After reaction times of 10 min, 30 min, 1, 2, 4, 24, 48, and 96 h, soil and ion-exchange resin were separated and ions were extracted from the resin. After 0, 4, and 96 h, the authors determined metal concentrations in seven fractions. On average, the total release after 96h (in percentage of the total concentration) decreased in the order: Cd (74) > Pb (59) > Cu (29) > Zn (22) > Ni (17) > Cr (3.1), while the initial release rate into solution decreased in the order: Cd > Zn > Ni > Cu > Pb > Cr. After 48 h, only the Cr release rate was lower than that of Cd. Particularly in less acid soils, Pb, Cu, Zn, and Cd released by the dissolution of oxides were adsorbed onto the soil matrix, explaining the slower decrease of the Pb and Cu release rates. The percentages of weakly bound heavy metals decreased more markedly during the titration than those of metals bound to Fe oxides. Increased H{sup +} inputs into Slovak soils will cause enhanced metal release into soil solution.

• Sponsoring Organization: USDOE
• OSTI ID: 678086
• Journal Information: Soil Science Society of America Journal, Journal Name: Soil Science Society of America Journal Journal Issue: 2 Vol. 63; ISSN 0361-5995; ISSN SSSJD4
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
CADMIUM
CHROMIUM
COPPER
LEAD
MONITORING
NICKEL
PH VALUE
SLOVAKIA
SOIL CHEMISTRY
SOILS
ZINC