ENVIRONMENTAL chemistry, ACID deposition & the environment, SOIL moisture, DISSOLVED organic matter, RESEARCH methodology, LYSIMETER, and SULFUR in soils
The aim of this study was to explore how acid deposition may affect the concentration and quality of dissolved organic matter (DOM) in soil-water. This was done by a small-scale acidification experiment during two years where 0.5 × 0.5 m² plots were artificially irrigated with water with different sulfuric acid content, and soil-water was sampled using zero-tension lysimeters under the O-horizon. The DOM was characterized using absorbance, fluorescence, and size exclusion chromatography analyses. Our results showed lower mobility of DOM in the high acid treatment. At the same time, there was a significant change in the DOM quality. Soil-water in the high acid treatment exhibited DOM that was less colored, less hydrophobic, less aromatic, and of lower molecular weight, compared to the low acid treatment. This supports the hypothesis that reduction in sulfur deposition is an important driver behind the ongoing brownification of surface waters in many regions. [ABSTRACT FROM AUTHOR]
Focuses on the importance of experiments based on the principles of green chemistry in Oregon. Modern reactions in the organic chemistry lab curriculum; Promotion of green chemistry approach by the American Chemical Society; Description of a benign method for synthesizing tetraphenylporphyrin in the textbook by professor James Hutchison. INSET: Green lab experiments..