2009S&T Water Sampling for Pesticides
2009 S&T Water Sampling for Pesticides
Problem Statement Pesticides analyzed by AXYS and CDFG -Chlorpyrifos and diazinon extracts sent to CDFG -Stopped in 2006 2006 and 2007 extracts on hold ·CDFG Issues with TPP surrogate Unclear whether it was related to spiking or extraction
Problem Statement • Pesticides analyzed by AXYS and CDFG – Chlorpyrifos and diazinon extracts sent to CDFG – Stopped in 2006 • 2006 and 2007 extracts on hold • CDFG – Issues with TPP surrogate • Unclear whether it was related to spiking or extraction
2008 Demonstration Project Conducted analysis of whole water(8 L) using MRES and 100 L samples using MRES at 6 sites Confirmation that MDLs are sufficient to detect compounds Comparison between collection methods to evaluate accuracy of method and potential for using MRES to analyze archived extracts
2008 Demonstration Project • Conducted analysis of whole water (8 L) using MRES and 100 L samples using MRES at 6 sites – Confirmation that MDLs are sufficient to detect compounds – Comparison between collection methods to evaluate accuracy of method and potential for using MRES to analyze archived extracts
Staff Recommendation Have all pesticide analyses conducted by AXYS Analytical using MRES method on 100 liter infiltrix system Slight increase to program cost (~$100/sample)
Staff Recommendation • Have all pesticide analyses conducted by AXYS Analytical using MRES method on 100 liter infiltrix system • Slight increase to program cost (~$100/sample)
Results·MDLs In general whole water have higher MDLs than 100 L;most within a factor of two 80.00 70.00 60.00 50.00 ◆一 Whole water 40.00 -Particulate 30.00 20.00 ◆-Dissolved 10.00 0.00 DDD(p.p) Chlordane,gamma Chlorpyrifos Diazinon Endosulfan I
Results - MDLs • In general whole water have higher MDLs than 100 L; most within a factor of two 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 DDD(p,p ') Chlordane, gamma- Chlorpyrifos Diazinon Endosulfan I MDL (pg/L) Whole water Particulate Dissolved
Results Comparison Whole Water to 100 L(DDD (p,p')) 600 -Whole water 300 200 100L 100 0 BG20 CB025W LSB034W-avg LSB036W SB050W SPB025W Station
Results - Comparison Whole Water to 100 L (DDD (p,p’)) 0 100 200 300 400 500 600 BG20 CB025W LSB034W - avg LSB036WSB050WSPB025W Station Conc (pg/L) Whole water 100 L
Comparison Whole Water to 100L (Chlordane-gamma) 300 250 ◆一 Whole water 1 -100L 0 BG20 CB025W LSB034W-avg LSB036W SB050W SPB025W Station
C o m p a r i s o n - W h o l e W a t e r t o 1 0 0 L ( C h l o r d a n e - g a m m a ) 0 5 0 10 0 15 0 2 0 0 2 5 0 3 0 0 BG20 CB025W LSB034W - avg LSB036W SB050W SPB025W S t a tio n Conc Chlordane (pg/L) W h ole w ate r 10 0 L
Comparison -Whole Water to 100L (Diazinon Chlorpyrifos) 350 (7/6d)ouo 器 ◆—Chlorpyrifos Whole 150 water Chlorpyrifos 100 L 50 0 Diazinon Whole BG20 CB025W LSB034W-avg LSB036W SB050W SPB025W water Diazinon 100 L Station
Comparison - Whole Water to 100L (Diazinon / Chlorpyrifos) 0 50 100 150 200 250 300 350 BG20 CB025W LSB034W - avg LSB036WSB050W SPB025W Station Conc (pg/L) Chlorpyrifos Whole water Chlorpyrifos 100 L Diazinon Whole water Diazinon 100 L
Comparison to Historical Data 601410080600000 Historic Whole Water Average 口100 L Average DDD(p.p) DDE(p.p) Chlordane,gamma Chlorpyrifos Dieldrin Diazinon Endosulfan
Comparison to Historical Data 0 20 40 60 80 100 120 140 160 180 200 DDD(p,p ') DDE(p,p ') Chlordane, gamma-Dieldrin Chlorpyrifos Diazinon Endosulfan I Historic Whole Water Average 100L Average