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Methoddevelopmentfortheanalysisoforganophosphateandpyrethroid
insecticidesatlowpartspertrillionlevelsinwater

Pyrethroidsarestronglyadsorbedontosoilandsediment， leadstotherelativelylowconcentrationsofthesepesticidesin surfacewater。Inaddition， toxicologicalstudiesperformedinwater- onlysystemshavefoundthatthesepesticidescauselethaland sublethaleffectsatextremelylowconcentrations， withLC50s
beinggenerallylessthan1ng/mL [14]。Forexample， cyperme- thrinhasLC50valuesof1.2， 0.9and0.5ng/mLforbrowntrout，
carpandrainbowtrout，分别[15]。Whenmosquitoand midgelarvaeweretested， 24hLC50valuesfordeltamethrin， cypermethrin， fenvalerateandpermethrinrangedfrom0.02to
13ng/mL [16]。Deltamethrinandcypermethrinhave96hLC50s ofabout0.01ng/mLinlobster (Homarusamericanus) andshrimp
(Crangonseptemspinosa) [17,18]。Toxicitytotheamphipod Hyalella
azteca occursatconcentrationsaslowas0.002and0.005ng/mL
for-cyhalothrinandcypermethrin，分别[19,20]。那里 fore， thereisaneedtoemploysensitivetraceanalysismethods forthemeasurementandpositiveidenticationofthesepesti- cidesatthelownanogramperliterlevel。坚实phaseextraction (SPE) [21C27，坚实phasemicro提取(SPME) [24,28,29]，混乱
barsorptionextraction (SBSE) [30C32 andliquid-phasemicro-
extraction (LPME) [33,34] haveattractedincreasingattentionas novelsamplepretreatmenttechniques。Theneedforstrictexper- imentalcontrolandlongequilibriumtimes， howeverlimitsthe applicationofSPME， SBSEandLPMEinlarge-scaleanalysisof eld-collectedwatersamples。而且， thestrongtendencyof pyrethroidstoadsorbtoglasscontainerscancausedecreased SPErecoveriesandsubstantialunderestimationofpyrethroid
concentrations [27] andcansignicantlyaffecttheobservedout-
comeintoxicologicaltesting [35]。因此， liquidCliquidextractio (LLE) stillranksasoneofthemostconventionalandeffec- tiveisolationtechniques， whichisparticularlysuitablefordirect extractionofeld-collectedwatersamplestoexcludepossible analytelossduringsamplecollection，发货， andstorage
[27]。

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