Arsenic determination and arsenic, lead and copper content of Missouri soils
Colorimetric methods for determining arsenic content of plant, soil, and solution samples were examined. The method used provides quantitative estimates of arsenic in plants, soils, and solutions when 5..mu..g/g or more arsenic was present in soil or plant tissue, or 0.250 ..mu..g/ml solution. The lower detection limit was 0.5 ..mu..g/g for plant tissue and soils, and 0.1 ..mu..g/ml solution. Wet oxidation of samples using nitric and perchloric acids was compared and found to be more reliable than dry ashing using a slurry of magnesium oxide-magnesium nitrate as a method of solubilizing the As from plant and soil samples. Arsenic, lead, and copper levels were determined in soils from several orchards and former potato fields in Missouri and compared to naturally occurring levels. No copper accumulation was found in any of the samples tested. The potato fields were free of arsenic and lead contamination. In the orchard soils, lead and arsenic was concentrated in the top foot and varied from very high to naturally occurring levels. The Bray tests for available phosphorus were high by 0.8 to 14.8% due to arsenic interference on soils from the arsenic contaminated fields. Platinum electrodes were buried at depths of 7.5, 15, 30, and 60 cm in a Mexico soil that had been treated with 100 ppm As and various amounts of sugar, sewage sludge nitrogen, and water. Reed canary grass was planted after the treatments had been added. One half of the plots were treated wth 7.5 cm water per week, while the other half did not receive any water. The Eh and pH were measured weekly throughout the growing season, and periodically during the rest of the year. The Reed canary grass was harvested six times during the growing season, and the yield increased with increased nitrogen application. The amount of arsenic in the plant tissue was measured, and found to decrease toward later stages of the growing season.
- OSTI ID:
- 6483907
- Resource Relation:
- Other Information: Research Bulletin 1020; Related Information: Research Bulletin 1020
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ARSENIC
ABSORPTION SPECTROSCOPY
COPPER
GRASS
QUANTITATIVE CHEMICAL ANALYSIS
LEAD
SOILS
BIOLOGICAL ACCUMULATION
MISSOURI
SOIL CHEMISTRY
CHEMICAL ANALYSIS
CHEMISTRY
ELEMENTS
FEDERAL REGION VII
METALS
NORTH AMERICA
PLANTS
SEMIMETALS
SPECTROSCOPY
TRANSITION ELEMENTS
USA
510200* - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)