TY - JOUR
T1 - Plant-accelerated dissipation of phenanthrene and pyrene from water in the presence of a nonionic-surfactant
AU - Gao, Yanzheng
AU - Ling, Wanting
AU - WONG, Ming Hung
N1 - Funding Information:
Financial support from the National Natural Science Foundation of China (No. 20507009), and the Young Scientist Innovation Science Foundation of Nanjing Agricultural University (No. KJ05009), and the University Grants Committee of Hong Kong (City U, Project No. AoE/P-04/04) is gratefully acknowledged.
PY - 2006/6
Y1 - 2006/6
N2 - Plant-accelerated dissipation of phenanthrene and pyrene in water in the presence of a nonionic-surfactant (Brij35) was studied. The mechanisms involved were evaluated, based on the investigation of plant uptake of these compounds from water with Brij35. The presence of ryegrass (Lolium multiflorum Lam) clearly enhanced the dissipation of tested PAHs in water with 0-296 mg l-1 Brij35. The first-order rate constants (K), calculated from the first-order kinetic models for these PAH degradation (all significant at P < 0.05, n = 8), of phenanthrene and pyrene in the presence of ryegrass were 16.7-50% and 47.1-108% larger than those of plant-free treatments, whereas half-lives (T1/2) of the former were 14.3-33.4% and 32.0-52.0% smaller than the latter, respectively. However, the promotion of PAH dissipation by ryegrass was found to significantly decrease with increasing Brij35 concentrations. In the range of 0-296 mg l-1, low concentrations ({less-than or slanted equal to}74.0 mg l-1) of Brij35 generally enhanced plant uptake and accumulation of phenanthrene and pyrene, based on the observed plant concentrations and accumulated amounts of these chemicals from water. In contrast, Brij35 at relatively high concentrations ({greater than or slanted equal to}148 mg l-1) markedly restricted plant uptake of these PAHs. Plant accumulation of phenanthrene and pyrene accounted for 6.21-35.0% and 7.66-24.3% of the dissipation enhancement of these compounds from planted versus unplanted water bodies. In addition, plant metabolism was speculated to be another major mechanism of plant-accelerated dissipation of these PAHs in water systems. Results obtained from this study provided some insight with regard to the feasibility of phytoremediation for PAH contaminated water bodies with coexisted contaminants of surfactants.
AB - Plant-accelerated dissipation of phenanthrene and pyrene in water in the presence of a nonionic-surfactant (Brij35) was studied. The mechanisms involved were evaluated, based on the investigation of plant uptake of these compounds from water with Brij35. The presence of ryegrass (Lolium multiflorum Lam) clearly enhanced the dissipation of tested PAHs in water with 0-296 mg l-1 Brij35. The first-order rate constants (K), calculated from the first-order kinetic models for these PAH degradation (all significant at P < 0.05, n = 8), of phenanthrene and pyrene in the presence of ryegrass were 16.7-50% and 47.1-108% larger than those of plant-free treatments, whereas half-lives (T1/2) of the former were 14.3-33.4% and 32.0-52.0% smaller than the latter, respectively. However, the promotion of PAH dissipation by ryegrass was found to significantly decrease with increasing Brij35 concentrations. In the range of 0-296 mg l-1, low concentrations ({less-than or slanted equal to}74.0 mg l-1) of Brij35 generally enhanced plant uptake and accumulation of phenanthrene and pyrene, based on the observed plant concentrations and accumulated amounts of these chemicals from water. In contrast, Brij35 at relatively high concentrations ({greater than or slanted equal to}148 mg l-1) markedly restricted plant uptake of these PAHs. Plant accumulation of phenanthrene and pyrene accounted for 6.21-35.0% and 7.66-24.3% of the dissipation enhancement of these compounds from planted versus unplanted water bodies. In addition, plant metabolism was speculated to be another major mechanism of plant-accelerated dissipation of these PAHs in water systems. Results obtained from this study provided some insight with regard to the feasibility of phytoremediation for PAH contaminated water bodies with coexisted contaminants of surfactants.
KW - Phytoremediation
KW - Plant
KW - Polycyclic aromatic hydrocarbons (PAHs)
KW - Surfactant
KW - Water
UR - http://www.scopus.com/inward/record.url?scp=33646389258&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2005.09.058
DO - 10.1016/j.chemosphere.2005.09.058
M3 - Journal article
C2 - 16581106
AN - SCOPUS:33646389258
SN - 0045-6535
VL - 63
SP - 1560
EP - 1567
JO - Chemosphere
JF - Chemosphere
IS - 9
ER -