การศึกษาการตกสะสมของกรดแห้งเหนือพื้นที่เพาะปลูกข้าวด้วยฟิลเตอร์แพค

A Study of Dry Acid Deposition over Rice Plantation Using a Filter Pack Method

Name: ศิวาพร แผ่นทอง

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Dry Acid Deposition

; Critical Load

; Acid Substance

; Filter Pack

Abstract: This research focused on the measuring quantities of dry acids deposited on the paddy rice field in Thailand using a four stages filter pack method. The rice field site to collect air samples was located in Tambol Bungnamrak, Ampher Bangnampriew, Chacherngsao Province. This area could be represented as general characteristics of Thailand rice farming. The length of air sample collection was taken for 6 months, between the last week of January and the middle of July 2003. Each air sample was continuously collected for 5 days using 0.5 litre per minute of air flow rate. The collected samples were then analised using Ion Chromatography technique to determine the quantities of SO42-, NO3-, Cl-, Na+, K+, Mg2+ and Ca2+.The study results showed that the concentration of gases and ions in the atmosphere were changed in respect to the seasons. Most of the measured concentrations found in high quantities were in the winter and then decreased respectively in the summer and the rainy seasons. The gaseous NH3 was found to be at the highest concentration of 425.5 nmol/m3, followed by SO2 of 102.2 nmol/m3, HCl 49.8 nmol/m3 and HNO3 29.2 nmol/m3, respectively. The study of dry deposited sulfur with its relation to seasons illustrated the same trend as was found in the aforementioned. In regards of the winter season, the amount of sulfur deposition was 0.14 g/m2.month while in the summer, it was 0.09 g/m2.month and in the rainy season, 0.04 g/m2.month. For the amount of deposited nitrogen, its deposition was in the lesser extent than sulfur. The deposited nitrogen was determined to be 0.01, 0.07 and 0.002 g/m2.month for the winter, summer and rainy seasons, respectively. For annual depositions of sulfur and nitrogen, the deposition quantities were calculated to be 1.12 g/m2.year and 0.07 g/m2.year, respectively. This result obviously showed that sulfur was the main atmospheric acidic component that deposited on to the paddy rice field in the central region of Thailand. The measured quantity of sulfur deposition was compared with the critical load value of sulfur in the Chacherngsao Province and it was found that the quantity of sulfur collected in the study area (1,000-2,000 mg-S/m2.yr) was lower than the critical load value (3,000-5,000 mg-S/m2.yr). In conclusion, the paddy rice field in Tambol Bungnamrak, Ampher Bangnampriew, Chacherngsao Province would have a lesser risk caused by acidic sulfur deposited on to the rice fields. This also indicated its capacity to uptake additional sulfur deposited over the area.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: รศ.ดร. พจนีย์ ขุมมงคล

Role: อาจาร์ยที่ปรึกษา

Created: 2546

Issued: 2005-09-19

Modified: 2006-05-10

วิทยานิพนธ์/Thesis

ISBN: 9744563532

CallNumber: EV392

tha

DegreeName: Master of Science

Level: Master's Degree

Descipline: Environmental Technology

Grantor: King Mongkut's University of Technology Thonburi

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