The BLIND BLANK PROJECT (BBP) is designed to provide the U.S. Geological Survey's National Water Quality Laboratory (NWQL) a tool to evaluate their methods and rapidly identify method performance problems or contamination. It also aids in the determination of detection limits for many inorganic methods. The project submits double blind blank samples (identity of the sample as well as the concentration of the individual components within the sample is unknown to the analyst) to most of the inorganic analytical methods as well as some selected carbon and nitrogen methods. Data are collected and analyzed to determine trends, biases, and variability. Results are expected to be within the control limits (equal to +/- the detection limit). To see the Blind Blank charts, click on the links below.

The charts and data that you might secure from this U.S. Geological Survey (USGS) web page (identified as "BBP") 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.

For questions please contact Ted Struzeski

Blind Blank Project Chief (
U.S. Geological Survey
Denver Federal Center
Mail Stop 401, Box 25046
Denver, CO 80225

Blind Blank Charts (FY15-FY17)

Analysis Lab Code Test ID Analyte Analysis Lab Code Test ID Analyte
Nutrients 3116 00608SHC02 Ammonia (NH4+ as N), Fil, DA Ion Chromatography 3166 71870IC027 Bromide, Fil
2188 00610CL017 Ammonia (NH4+ as N), Unf, CFA    *Added 05/2015* 1571 00940IC022 Chloride, Fil
1985 00623KJ002 Kjeldahl Nitrogen (NH4+ +org N as N), Fil   0651 00950IC003 Fluoride, Fil
1986 00625KJ008 Kjeldahl Nitrogen (NH4+ +org N as N), Unf   *Added 02/2013* 1572 00945IC022 Sulfate, Fil
1991 00608CL036 Ammonia (NH4+ as N), Fil, FCA   *Discontinued 02/2013*      
1990 00631CL047 Nitrate plus Nitrite (NO3-+NO2- as N), Fil *Discontinued 02/2013* Arsenic Speciation 3142 62453PLM16 Arsenate [As(V)]
3156 00631RED01 Nitrate plus Nitrite (NO3-+NO2- as N), Fil 3142 62452PLM16 Arsenite [As(III)]
3157 00631RED01 Nitrate plus Nitrite (NO3-+NO2- as N), Fil, low-level 3142 62455PLM16 Dimethylarsinate
3117 00613DZ001 Nitrite (NO2- as N), Fil 3142 62454PLM16 Monomethylarsonate
3118 00671PHM01 Orthophosphate (PO4 3- as P), Fil        
2754 62854CL063 Total Nitrogen (NH4++NO3-+NO2-+org N as N), Fil, persulfate digestion Physical Properties 0070 90410TT040 Acid Neutralizing Capacity (ANC), TOT LAB-CaCO3
2756 62855AKP01 Total Nitrogen (NH4++NO3-+NO2-+org N as N), Unf, acidified, persulfate digestion 2109 29801TT040 Alkalinity, Filtered
1983 00666KJ005 Total Phosphorus (as P), Fil, Kjeldahl 0169 00530SLD04 ROE at 105 Degrees C, Suspended
2332 00666CL019 Total Phosphorus (as P), Fil, acidified, persulfate digestion, low-level   *Discontinued 11/2013* 0165 00500ROE12 ROE at 105 Degrees C, Total
2757 00666CL063 Total Phosphorus (as P), Fil, persulfate digestion 0027 70300ROE10 ROE. at 180 C  (TDS)
2331 00665KJ009 Total Phosphorus (as P), Fil, persulfate digestion, low-level 0069 90095WHT03 Specific Conductance
1984 00665KJ009 Total Phosphorus (as P), Unf, acidified, Kjeldahl 2187 63676TS098 Turbidity, NTRU
2333 00665CL021 Total Phosphorus (as P), Unf, acidified, persulfate digestion, low-level      
  2759 00665AKP01 Total Phosphorus (as P), Unf, acidified, persulfate digestion ICP-OES Unfiltered 2352 01007PLA15 Barium
        2353 01012PLA15 Beryllium
1202 71865CL033 Iodide, Colorimetry, ASF, Ceric-Arsenious 2354 01022PLA15 Boron
  3121 00955CL151 Silica, Water, automated discrete analysis (DA) 2355 01027PLA15 Cadmium
ICP-OES       2356 00916PLA15 Calcium
Filtered 0641 01005PLA11 Barium 2357 01034PLA15 Chromium
0655 01010PLA11 Beryllium 2391 01037PLA15 Cobalt
2110 01020PLA13 Boron 2358 01042PLA15 Copper
0673 01025PLA11 Cadmium 2359 01045PLA15 Iron
0659 00915PLA11 Calcium 2361 01132PLA15 Lithium
0722 01030PLA11 Chromium 2362 00927PLA15 Magnesium
0644 01035PLA11 Cobalt 2363 01055PLA15 Manganese
0657 01040PLA11 Copper 2364 01062PLA15 Molybdenum
0645 01046PLA11 Iron 2365 01067PLA15 Nickel
0664 01130PLA11 Lithium 2775 00937PLO01 Potassium
0663 00925PLA11 Magnesium 2366 00956PLA15 Silica
0648 01056PLA11 Manganese 2367 01077PLA15 Silver
0649 01060PLA11 Molybdenum 2368 00929PLA15 Sodium
0721 01065PLA11 Nickel 2369 01082PLA15 Strontium
2774 00935PLO02 Potassium, low-level 2370 01087PLA15 Vanadium
2773 00935PLO03 Potassium 2371 01092PLA15 Zinc
0667 00955PLA11 Silica      
0723 01075PLA11 Silver ICP-MS 2372 01105PLM48 Aluminum
0675 00930PLA11 Sodium Unfiltered 2373 01097PLM48 Antimony
0652 01080PLA11 Strontium   3123 01002PLM11 Arsenic (collision cell)
0653 01085PLA11 Vanadium   2374 01007PLM47 Barium
0671 01090PLA11 Zinc 2375 01012PLM47 Beryllium
ICP-MS 2501 01022PLM47 Boron
Filtered 1784 01106PLM43 Aluminum 2376 01027PLM47 Cadmium
  1785 01095PLM43 Antimony 3127 01034PLM11 Chromium (collision cell)
  3122 01000PLM10 Arsenic (collision cell) 3125 01037PLM11 Cobalt (collision cell)
1786 01005PLM43 Barium 3129 01042PLM11 Copper (collision cell)
1787 01010PLM43 Beryllium 2380 01051PLM48 Lead
2504 01020PLM40 Boron 2381 01132PLM48 Lithium
1788 01025PLM43 Cadmium 2382 01055PLM48 Manganese
3126 01030PLM10 Chromium (collision cell) 2383 01062PLM48 Molybdenum
3124 01035PLM10 Cobalt (collision cell) 3131 01067PLM11 Nickel (collision cell)
3128 01040PLM10 Copper (collision cell) 3133 01147PLM11 Selenium (collision cell)
1792 01049PLM43 Lead 2386 01077PLM48 Silver
2505 01130PLM40 Lithium 2387 01082PLM48 Strontium
1793 01056PLM43 Manganese 2388 01059PLM48 Thallium
1794 01060PLM43 Molybdenum 3137 01154PLM11 Tungsten (collision cell)
3130 01065PLM10 Nickel (collision cell) 2389 28011PLM48 Uranium
3132 01145PLM10 Selenium (collision cell) 3135 01187PLM11 Vanadium (collision cell)
1796 01075PLM43 Silver 3139 01092PLM11 Zinc (collision cell)
2507 01080PLM40 Strontium        
2508 01057PLM40 Thallium Carbon 2613 00681OX008 Dissolved Organic Carbon (DOC)
3136 01155PLM10 Tungsten (collision cell) 3211 00680COMB9 Total Organic Carbon (TOC)
1797 22703PLM43 Uranium 2606 00694COMB6 Total Particulate Carbon (TPC)
3134 01085PLM10 Vanadium (collision cell) 2608 0068800127 Total Particulate Inorganic Carbon (PIC)
3138 01090PLM10 Zinc (collision cell) 2607 49570COMB7 Total Particulate Nitrogen (TPN)
2707 71890CV014 Hg, Fil, CVAF Other 0096 38260SPEC2 MBAS, Total    *Discontinued 07/2015*
2708 71900CV018 Hg, UnF, CVAF 1369 82303LSC01 Radon-222, Unfiltered
        2614 50624UV005 UV Absor Orgn 254nm
        2615 61726UV007 UV Absor Orgn 280nm


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