The USGS Quality Systems Branch - Organic Blind Sample Project (OBSP) purpose is to monitor, assess and evaluate the USGS National Water Quality Laboratory (NWQL) organic analytical results through the use of blind quality assurance samples. The OBSP was implemented in 1996 and reviews over 600 organic constituents.
Charts and data secured from this U.S. Geological Survey (USGS) web page (identified as "OBSP") have not received official USGS approval and as such are provisional and subject to revision. The charts and data are released on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use.
Data Assessment by Analyte |
Data Assessment Tools |
Data Assessment by Analyte
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OBSP maintains a database for the retrieval, assessment and storage of blind quality assurance sample results.
Tools used in assessing the blind sample results can be viewed by analyte through the link below:
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Data Assessment Tools
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OBSP maintains a database for the retrieval, assessment and storage of blind quality assurance sample results. Tools used in assessing the blind sample results are accessed through the links below:
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Data Assessment by Method |
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Data Assessment by NWQL Lab Schedule (LS) or Lab Code (LC)
Current Hormones Method
- LS 4434; Hormones by SPE-GC/MS/MS, Unfiltered
Current Pesticides and Waste Water Indicators Methods
- LS 2033; Pesticides by SPE-GC/MS; Filtered
- LS 2447; Pesticides by HPLC-MS/MS;
- LS 4433; Waste Water Indicators by CLLE-GC/MS; Unfiltered
Current Pharmaceuticals Methods
- LS 2440; Pharmaceuticals by HPLC-MS, Water, Filtered
Current Volatiles Methods
- LS 4437; VOC Heated Purge and Trap by GC/MS
- LS 4440; VOC Ambient Purge and Trap by GC/MS
Current Carbon Methods
- LC 3211; Total Organic Carbon; Unfiltered
- LC 2625; Inorganic Dissolved Carbon; Filtered
- LC 2629; Dissolved Organic Carbon; Filtered
Historical Methods
- LS 1383; Semi-volatile Compounds (base/neutral/acid - BNA), Whole Water Recoverable; Discontinued April 2014; low demand
- LS 1433; Waste Water Compounds by GCMS, Filtered; Discontinued April 2014; replaced with LS4433
- LS 2001; Pesticides determinations by SPE and GCMS, Filtered; Discontinued April 2014; replaced with LS2437
- LS 2021; NAWQA 85 Volatile Organic Compounds by GCMS, Whole Water Recoverable; Discontinued April 2014; replaced with LS4440
- LS 2060; Polar Pesticides and Metabolites by SPE and HPLC/MS, Filtered; Discontinued April 2014; replaced with LS2437
- LS 2080; Pharmaceutical by HPLC/MS; Filtered; Discontinued September 2011; replaced with LC9017
- LS 2437; Pesticides by HPLC-MS/MS;
- LS 4024; Gasoline Oxygenates, Un-acidified, Wat, Unfiltered; Discontinued April 2014; Replaced by LS4437
- LS 4054; 85 Volatile Organic Compounds by GCMS @MRL, Acidified, Wat, Unfiltered; Discontinued
- LS 5433; Waste Indicators, Solids, Pres Solv Extr - SPE, by GC-MS
- LS 5506; PAHs and other semi-volatile organics
- LS 6434; Hormones in solids
- LC8093; Custom: Halo-organic compounds in solids/sediment (Kolpin)
- LC 9017; Pharmaceuticals by HPLC-MS, Water, Filtered; Interim unapproved schedule April 2012 to March 2014; replaced with LS2440
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U.S. Department of the Interior |
U.S. Geological Survey
