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Organochlorine pesticides (OCPs) in wetland soils under different land uses along
a 100-year chronosequence of reclamation in a Chinese estuary
#MMPMID26633149
Bai J
; Lu Q
; Zhao Q
; Wang J
; Gao Z
; Zhang G
Sci Rep
2015[Dec]; 5
(?): 17624
PMID26633149
show ga
Soil profiles were collected at a depth of 30 cm in ditch wetlands (DWs),
riverine wetlands (RiWs) and reclaimed wetlands (ReWs) along a 100-year
chronosequence of reclamation in the Pearl River Delta. In total, 16 OCPs were
measured to investigate the effects of wetland reclamation and reclamation
history on OCP levels. Our results showed that average ?DDTs, HCB, MXC, and ?OCPs
were higher in surface soils of DWs compared to RiWs and ReWs. Both D30 and D20
soils contained the highest ?OCP levels, followed by D40 and D100 soils; lower
?OCP levels occurred in D10 soils. Higher ?OCP levels were observed in the
younger RiWs than in the older ones, and surface soils exhibited higher ?OCP
concentrations in the older ReWs compared with younger ReWs. The predominant
percentages of ?-HCH in ?HCHs (>42%) and aldrin in ?DRINs (>46%) in most samples
reflected the recent use of lindane and aldrin. The presence of dominant DDT
isomers (p,p'-DDE and p,p'-DDD) indicated the historical input of DDT and
significant aerobic degradation of the compound. Generally, DW soils had a higher
ecotoxicological risk of OCPs than RiW and ReW soils, and the top 30?cm soils had
higher ecotoxicological risks of HCHs than of DDTs.
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