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Effects of de-icing chemicals sodium chloride and potassium formate on cadmium solubility in a coarse mineral soil
- Source :
- The Science of the total environment. 366(2-3)
- Publication Year :
- 2005
-
Abstract
- Excessive use of sodium chloride (NaCl) as de-icing chemical causes environmental problems, such as elevated chloride concentrations in groundwater. On vulnerable sites, this can be avoided by using alternative organic de-icing chemicals, such as potassium formate (KHCOO). The environmental impacts of KCHOO are, however, not well known. This study reports the potential effects of NaCl and KCHOO on mechanisms controlling the mobility of cadmium (Cd) in roadside soils as a result of vehicular traffic. Changes in the solubility of Cd in a coarse mineral soil treated with these two de-icing chemicals were studied in a 50-day incubation experiment under four different moisture and temperature combinations and an initial soil Cd concentration of 3 mg kg − 1 . After incubation, the distribution of soil Cd into different fractions was analyzed using a sequential extraction method. Soil pH and soil redox potential were recorded and the occurrence of Cd–Cl complexes in the soil was estimated using published stability constants. During incubation, KCHOO lowered the soil redox potential, but this was not accompanied by a decrease in the sorption capacity of oxides and the release of oxide-bound Cd into soil solution. On the other hand, elevated pH (from 4.3 to 6.7–8.5) in the formate treatments increased the sorption of Cd onto the oxide surfaces (up to 80% of total sorbed Cd). In the NaCl treatments, cation competition and formation of Cd–Cl complexes increased the water-soluble Cd fraction. Consequently, the amount of bioavailable Cd was 3.5 times smaller in the KCHOO than in the NaCl treatments.
- Subjects :
- Environmental Engineering
Formates
Sodium
Inorganic chemistry
chemistry.chemical_element
Transportation
010501 environmental sciences
Sodium Chloride
complex mixtures
01 natural sciences
Chloride
chemistry.chemical_compound
Soil pH
medicine
Environmental Chemistry
Soil Pollutants
Solubility
Waste Management and Disposal
Soil Microbiology
0105 earth and related environmental sciences
Cadmium
Ice
Sorption
04 agricultural and veterinary sciences
Hydrogen-Ion Concentration
Pollution
Soil contamination
6. Clean water
Potassium formate
chemistry
Environmental chemistry
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
Oxidation-Reduction
medicine.drug
Subjects
Details
- ISSN :
- 00489697
- Volume :
- 366
- Issue :
- 2-3
- Database :
- OpenAIRE
- Journal :
- The Science of the total environment
- Accession number :
- edsair.doi.dedup.....40ef6f7a1e0f6f37d8377f564597b617