1 Using Integrative Passive Samplers to Monitor Current-Use and Legacy Pesticides in San Francisco Bay, CA Kelly L. Smalling and Kathryn M. Kuivila USGS.

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Presentation transcript:

1 Using Integrative Passive Samplers to Monitor Current-Use and Legacy Pesticides in San Francisco Bay, CA Kelly L. Smalling and Kathryn M. Kuivila USGS California Water Science Center Sacramento, CA April 24, 2007

2 Suisun Marsh Largest contiguous estuarine marsh on US west coast Major, but often ignored, component of the SF Estuary Covers 116,000 acres, including managed wetlands, upland grasses, tidal wetlands, channels and sloughs Intensely altered and managed for more than 100 years, mostly as a non-tidal freshwater wetland for waterfowl

3 Importance of Suisun Marsh Recognized as valuable tidal brackish environment and important habitat for native fish Supports at least 43 plant and animal species of special concern Best place left in the estuary to restore large areas of tidal marsh

4

Sampled 3 Sloughs with different contaminant inputs Summer 2005 and Winter 2006 Hill Slough Peytonia Slough Boynton Slough 5

Urban input: EPA 303d list for current-use insecticides Travis AFB - legacy organochlorine pesticides and current-use pesticides Inactive landfills - legacy organochlorine pesticides Hill Slough 6

Urban input: EPA 303d list for current-use insecticides and likely other pesticides from home use Managed wetlands - duck ponds with high DOM Peytonia Slough Duck Clubs 7

WWTP: likely source of current-use pesticides from home use Boynton Slough WWTP 8

9 Why Passive Samplers? Integrate over time Interested in a wide range of pesticides (log K ow = 1.5-7) –Combined SPMDs and POCIS to cover the range of K ow Monitoring legacy organochlorines and pyrethroids

10 Polar organic chemical integrative sampler (POCIS) used to monitor hydrophilic contaminants in water Easy to extract and analyze Contaminants with log K ow <4 Integrates over time

11 SPMD/POCIS deployment/retrieval

12 POCIS Extraction/Analysis Rinsed HLB sorbent into glass columns with MeOH Extracted w/ 1:1:8 MeOH:EtOAc:DCM Filtered particulates using GF/F. Removed matrix with carbon SPE cartridges Analyzed by GC/MS for ~ 50 pesticides

13 Pesticide Concentrations in POCIS Samplers (ng/g POCIS ) Boynton Slough Hill Slough Peytonia Slough Boynton Slough Hill Slough CPOCIS (ng/g) SIMAZINE METOLACHLOR TRIFLURALIN PENDIMETHALIN FIPRONIL SummerWinter

14 POCIS Field Validation Collected water samples at beginning and end of each deployment Current-use pesticides detected in both water samples at a site (pendimethalin, simazine) Other pesticides were only detected in one of the samples at a site (hexazinone, oxyfluorfen)

15 TRIFLURALIN SIMAZINE METOLACHLOR PENDIMETHALIN FIPRONIL POCIS Water Frequency of Detection

16 Comparison of Water Analysis with POCIS If detected in water, results of POCIS agreed well (pendimethalin, simazine, trifluralin) Some pesticides detected at low concentrations in POCIS but at or below detection limit in water (metolachlor) Transient compounds do not show up in POCIS (hexazinone) Good indicator of water concentration over time Eliminates the need to catch definitive pesticide ‘pulses’ Does not over estimate

17 PROBLEMS ?? Biofouling and sediment build-up may hinder uptake in environments with high- suspended sediment loads

18 Semi-permeable membrane devices (SPMDs) used to monitor hydrophobic contaminants in water Samples only dissolved form Contaminants with log K ow >4 Integrates over time

19 SPMD Extraction/Analysis Dialyzed 24 hrs in hexane ( EST ) Matrix/lipid removed by GPC ( 98:2 DCM:MeOH ) Clean-up/fractionation –5 g Florisil ( 5% deactivated ) –5 g activated silica gel –Collected 2 fractions Analyzed by GC/MS ( 25 current-use ) and GC/ECD ( 26 legacy OCs )

 -Chlordane Dieldrin 4,4 DDE 4,4 DDD 4,4 DDT Relative Abundance  Chlordane Boynton Slough Hill Slough Peytonia Slough Summer Winter

Boynton Slough Hill Slough Peytonia Slough Boynton Slough Hill Slough Concentration (ng/SPMD) TRIFLURALIN PCA PCNB CHLORPYRIFOS PENDIMETHALIN BIFENTHRIN PERMETHRIN SummerWinter Current-use Pesticides in SPMDs

Boynton Slough Hill Slough Peytonia Slough Boynton Slough Hill Slough Number of detects Current-use Legacy OCs Summer Winter Constant source of legacy OCs to the estuary year around Occurrence of current-use pesticides dependent on use and run-off Greater number of detects in the winter compared to the summer

23 POCIS SPMD decreasing solubility – increasing hydrophobicity Metolachlor Fipronil Simazine Trifluralin Pendimethalin PCA Chlorpyrifos PCNB Dieldrin Bifenthrin Chlordanes 4,4 DDD Permethrin 4,4 DDE 4,4 DDT

24 Of interest due to increasing use and high toxicity to fish Should work since log K ow > 4 But size and shape hinder their passing through the SPMD membrane Also more difficult to remove pyrethroids from SPMDs, resulting in high background of extracted samples Pyrethroids in SPMDs

25 Using Passive Samplers for Pesticides Useful to combine POCIS (more polar/hydrophilic) with SPMDs (more hydrophobic/less water soluble) Good indicator for concentrations below typical MDLs Integrate over time – eliminate complexity due to episodic pulses ALWAYS TEST – potential problems with pyrethroids

26 Future Directions Laboratory uptake studies to validate effectiveness of passive samplers for current-use pesticides Specifically focus on pyrethroids and uptake/extraction from SPMDs Future deployments of samplers in other areas where dissolved pesticides are of concern

27 Acknowledgments Funded by USGS Priority Ecosystem Science Study James Orlando (USGS Sacramento, CA) Cynthia Brown, Ed Moon and Francis Parcheso (USGS, Menlo Park, CA) Carl Orazio, David Alvarez, and Walter Crannor (USGS, Columbia, MO) Environmental Sampling Technologies (EST)