Impact of pH buffer capacity of sediment on dechlorination of atrazine using zero valent iron.
This research investigated the role of the pH buffer capacity of sediment on the dechlorination of atrazine using zero valent iron (ZVI). The buffer capacity of the sediment was quantified by batch experiments and estimated to be 5.0 cmol OH(-) . pH(-1). The sediments were spiked with atrazine at 7.25-36.23 mg kg(-1) (6.21 x 10(-7)-3.09 x 10(-6) mol atrazine . g(-1) sediment) for the batch experiments. The buffer capacity of the sediment maintained the sediment suspension at neutral pH, thereby enabling continuous dechlorination until the buffer capacity of the sediment was depleted. The pseudo-first order dechlorination constants were estimated to be in the range of 1.19 x 10(-2)-7.04 x 10(-2) d(-1) for the atrazine-spiked sediments.
Kim
Geonha
G
Department of Civil and Environmental Engineering, Hannam University, Daejeon, Republic of Korea. kimgh@hannam.ac.kr
Jeong
Woohyeok
W
Choe
Seunghee
S
D001280:Atrazine / Q000737:chemistry*; D002021:Buffers; D019015:Geologic Sediments / Q000737:chemistry*; D006540:Herbicides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010084:Oxidation-Reduction; D010316:Particle Size; D014874:Water Pollutants, Chemical / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
D002021:Buffers; D006540:Herbicides; D014874:Water Pollutants, Chemical; D001280:Atrazine