การศึกษาพฤติกรรมในระดับห้องปฏิบัติการและจำลองลักษณะการชะละลายและการเคลื่อนที่ของไนเตรทในระบบชั้นน้ำใต้ดินอิ่มตัว

• Main Author: รัชพล พิพิธสมบัติ
• Other Authors: อักษรา พฤทธิวิทยา
• Format: Theses and Dissertations
• Language: Thai
• Published: จุฬาลงกรณ์มหาวิทยาลัย 2010
• Subjects: ดิน > ปริมาณไนเตรต; Nitrates; Groundwater > Nitrate content; Soils > Nitrate contentน้ำใต้ดิน > ปริมาณไนเตรต; ไนเตรต
• Online Access: https://digiverse.chula.ac.th/Info/item/dc:43681
• Institution: Chulalongkorn University

Nitrate, from both natural and human activities, is a common soil and groundwater contaminant. The immediate health effect is methemoglobinemia (Blue-Baby-Syndrome) in which the reduction of nitrate in the digestive tract by nitrate-reducing bacteria and nitrite combines with the hemoglobin that carries oxygen forming methemoglobin which cannot carry oxygen. Severe nitrate enrichment in soil and shallow groundwater aquifers in Suphanburi was discovered owing to the intensive farming with excess fertilization. This research emphasizes to explore and study contaminated of nitrate in soil and unsaturated groundwater aquifers that has latency in leached and contaminated in groundwater in study area. The possibility of nitrate leachate and transport into soil water in 14 samples representing 3 porous media groups from the study area (mainly near agricultural fields) was analyzed for NO3- -N and examined by laboratory-scaled column transport experiments. The results indicted that significant amounts of NO3- (> 90%) could be leached. Pore exclusion was also observed based on the early nitrate breakthrough. Gradual sorption behavior of nitrate was experienced in all soil samples tested, resulting in the maximum normalized nitrate concentration of less than unity. Even longer tailing effects were observed, especially in soil samples S3 and S8, suggesting a significant back diffusion of nitrate into pore water. The observed data were used in MODFLOW and MT3D model.