[Effect of sewage sludge and its composts on the accumulation of organic pollutants in Ipomoea aquatic grown in paddy soil].
Eight kinds of organic pollutants including 44 compounds in Ipomoea aquatic grown in paddy soil fertilized with sewage sludge and its composts were systematically determined by GC/MS. The results showed that twenty eight compounds consisting mainly of phthalic acid esters, nitrobenzenes, and polycyclic aromatic hydrocarbons were deteced in Ipomoea aquatic. Only individual or very few compounds for each kind of organic pollutants in Ipomoea aquatic were predominant, while others were trace or not detected. Compared with control, compounds detected in Ipomoea aquatic fertilized with sludge were commonly higher to a different extent, but those detected in Ipomoea aquatic fertilized with different sludge composts were commonly lower and even not detected, especially for Ipomoea aquatic fertilized with sludge + rice straw composts was detected only one compound. It was therefore concluded that direct use of sewage sludge as organic fertilizer could result in bioaccumulation of organic pollutants in crops, but sludge compost application would be safe if proper compost treatment for sludge was conducted.
Mo
Cehui
C
College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
Cai
Quanying
Q
Wu
Qitang
Q
Wang
Boguang
B
Li
Guirong
G
Zhu
Xizhen
X
D005308:Fertilizers; D012722:Sewage; D012989:Soil Pollutants / Q000032:analysis*
D005308:Fertilizers; D012722:Sewage; D012989:Soil Pollutants