Effect of copper on the degradation of pesticides cypermethrin and cyhalothrin.
The influence of coexisting copper (Cu) ion on the degradation of pesticides pyrethroid cypermethrin and cyhalothrin in soil and photodegradation in water system were studied. Serial concentrations of the pesticides with the addition of copper ion were spiked in the soil and incubated for a regular period of time, the analysis of the extracts from the soil was carried out using gas chromatography (GC). The photodegradation of pyrethroids in water system was conducted under UV irradiation. The effect of Cu2+ on the pesticides degradation was measured with half life (t0.5) of degradation. It was found that a negative correlation between the degradation of the pyrethroid pesticides in soil and Cu addition was observed. But Cu2+ could accelerate photodegradation of the pyrethroids in water. The t0.5 for cyhalothrin extended from 6.7 to 6.8 d while for cypermethrin extended from 8.1 to 10.9 d with the presence of copper ion in soil. As for photodegradation, t0.5 for cyhalothrin reduced from 173.3 to 115.5 min and for cypermethrin from 115.5 to 99.0 min. The results suggested that copper influenced the degradation of the pesticides in soil by affecting the activity of microorganisms. However, it had catalyst tendency for photodegradation in water system. The difference for the degradation efficiency of pyrethroid isomers in soil was also observed. Copper could obviously accelerate the degradation of some special isomers.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China. liutingfeng74@163.com
Ting-feng
TF
Liu
Cheng
C
Sun
Na
N
Ta
Jun
J
Hong
Shao-gui
SG
Yang
Chuan-xiang
CX
Chen
D002849:Chromatography, Gas; D003300:Copper / Q000737:chemistry*; D015394:Molecular Structure; D009570:Nitriles / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry; D010777:Photochemistry / Q000379:methods; D011722:Pyrethrins / Q000737:chemistry*; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000528:radiation effects
D009570:Nitriles; D010575:Pesticides; D011722:Pyrethrins; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; C017160:cypermethrin; D003300:Copper; C037304:cyhalothrin