Comparison of extractants for plant-available zinc, cadmium, nickel, and copper in contaminated soils

Journal Article · Tue Jul 01 04:00:00 EDT 1980 · Soil Sci. Soc. Am. J.; (United States)

DOI:https://doi.org/10.2136/sssaj1980.03615995004400040023x· OSTI ID:5073285

Haq, A U; Bates, T E; Soon, Y K

The objective of this study was to find a suitable extractant(s) for plant-available metals in metal contaminated soils. Swiss chard (Beta vulgaris L. Fordhook Giant) was grown in greenhouse pots on 46 Ontario soils varying in degree of contamination with metals. The soils had been contaminated with metals to varying degrees over a period of years. After 40 days, the plants were harvested and Zn, Cd, Ni, and Cu concentrations were measured. Each soil was extracted with nine different extractants: aqua regia, 0.01M EDTA, 0.005M DTPA, 0.02M NTA, 0.5N CH/sub 3/COOH, 1N CH/sub 3/COONH/sub 4/, 0.6N HCl + 0.05N AlCl/sub 3/, (COOH)/sub 2/ + (COONH/sub 4/)/sub 2/, and H/sub 2/O. Zinc, cadmium, nickel, and copper concentrations in Swiss chard were correlated with the amounts of soil Zn, Cd, Ni, and Cu removed by each extractant. Of the nine soil extractants, CH/sub 3/COONH/sub 4/ was the best predictor of plant-available Zn if only extractable Zn and soil pH were included as independent variables in a regression equation. Acetic acid was the best extractant for prediction of both plant-available Cd and Ni when soil pH was included in the equation. Attempts to find a suitable soil extractant for plant-available Cu were unsuccessful.

• Research Organization: Univ. of Guelph, Ontario
• OSTI ID: 5073285
• Journal Information: Soil Sci. Soc. Am. J.; (United States), Journal Name: Soil Sci. Soc. Am. J.; (United States) Vol. 44:4; ISSN SSSJD
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AMINO ACIDS
CADMIUM
CARBOXYLIC ACIDS
CHELATING AGENTS
CHEMICAL COMPOSITION
CONTAMINATION
COPPER
EDTA
ELEMENTS
EXTRACTION
FOOD
METALS
NICKEL
ORGANIC ACIDS
ORGANIC COMPOUNDS
PH VALUE
PLANTS
SEPARATION PROCESSES
SOILS
SOLVENT EXTRACTION
TRANSITION ELEMENTS
VEGETABLES
ZINC