Organophosphorous Pesticides and Herbicides
This Fact Sheet is presented by the U. S. Environmental Protection Agency, Region III (EPA) to assist in the selection of analytical parameters and the associated Quality Assurance and Quality Control (QA/QC) procedures to be utilized in Phase II Environmental Assessments under the U.S. Environmental Protection Agency (EPA) Brownfields initiative. This fact sheet is presented for informational purposes only, and should not be construed as a federal policy or directive. The Brownfields Coordinator for this region may be reached at 215-814-5000.
ORGANOPHOSPHOROUS PESTICIDES COMPOUNDS *
- Azinphos Methyl
- Dichlorous, Disulfoton
- Parathion Methyl
- Stirophos (Tetrachloryinphos)
- Tokuthion (Prothiofos)
- 2,4,5-TP (Silvex)
* Please note: The list above corresponds to pesticide and herbicide lists contained in the methods listed below, and is not a complete list of all toxic pesticide or herbicide compounds. If the site history suggests a pesticide or herbicide compound may be present which is not on this list, the compound should be included in the requested analysis.
Please note that the methods listed below are EPA approved and the most commonly used by EPA and their contractors. However, they are not the only methods for the analysis of pesticide or herbicide compounds. In addition, these are not drinking water test methods.
|EPA 615 (1) or EPA SW-846 3010 or 3020/8150 (2)||Aqueous Herbicides|
|EAP 614 (1) or EPA SW-846 3010 or 3020/8140 (2)||Aqueous Pesticides|
|EPA SW-846 3500 or 3550/8150 (2)||Soil/Sediment & Waste Herbicides|
|EPA SW-846 3500 or 3550/8140 (2)||Soil/Sediment & Waste Pesticides|
- U.S. Environmental Protection Agency (EPA). 1992. Test Methods for Organic Chemical Analysis of Municipal and Industrial Wastewater. Washington, D.C. July.
- EPA. 1986. Test Methods for Evaluating Solid Waste. SW-846. Washington, D.C. September.
Listed below are the EPA-recommended preservation and holding times as well as suggested glassware.
|Soil/Sediment||8-oz wide mouth jar||1 8-oz jar||ice to 4º C||14 days|
|Aqueous||32-oz amber bottle||2 amber bottles||ice to 4º C||7 days|
|Waste||8-oz wide mouth jar||1 8-oz jar||none required
|none (try not to exceed 14 days)|
MINIMUM LABORATORY QUALITY CONTROL MEASURES
The laboratory should have Standard Operating Procedures available for review for the organophosphorous pesticide or herbicide analyses and for all associated methods needed to complete the pesticide or herbicide analysis, such as total solids, instrument maintenance, sample handling, and sample documentation procedures. In addition, the laboratory should have a Laboratory Quality Assurance/Quality Control Statement available for review which includes all key personnel qualifications.
|QC TYPE||FREQUENCY OF ANALYSIS||ACCEPTABLE LIMITS|
|Initial Calibration||Prior to analysis of samples (minimum three concentration levels for every compound and an instrument blank) and every 72 hours thereafter||% Relative Standard Deviation of Response Factors of < 25 (see method for any allowable variations), and a minimum Response Factor of >0.05 (see method for calculation), also resolution check criteria must be met, and retention time windows established|
|Continuing Calibration||Once every 10 sample runs (mid-level standard)||% Difference for Response Factor of < 25 (see method for any allowable variations), a minimum Response Factor of > 0.05 (see method for calculation), and retention times must be within windows|
|Second Column Confirmation||All hits||All hits must be confirmed on a dissimilar column from original analysis|
|Method Blank||Once per extraction batch||See method for allowable limits|
|Matrix Spike/Matrix Spike Duplicate||One MS/MSD per 20 samples or per extraction set||See method for limits|
|Surrogate Spikes||Added to each sample (see method for suggested surrogate compounds)||Report recovery|
MINIMUM DATA PACKAGE REQUIREMENTS
- Sample results in a tabular form (if soil or sediment) reported on a dry weight basis.
- Report % moisture or % solids for all soil and sediment samples.
- Report sample volumes or weights, as well as any dilution factors, for each sample analysis.
- Returned copy of the chain of custody form sent with the samples with laboratory receipt acknowledgment, and the internal or laboratory chain of custody forms.
- Method blank results.
- GC initial and continuing calibration data summary forms.
- GC pesticide breakdown and resolution forms, and analytical sequence forms.
- Surrogate spike recoveries, either on a separate table or with the results, including laboratory QC limits.
- Matrix spike recovery tables, including laboratory recovery and relative percent difference QC limits.
- Date samples were analyzed, on a separate sheet, or results page.
- Optional: sample, standard and blank chromatograms, instrument run logs, and total solids logs.
Note: The optional QC must be maintained by laboratory for at least one year for possible future QC audits.