Standard Reference Sample Project
Results for the Fall 2023 Inter-laboratory Comparison Study
List of participating laboratories
Analytes determined in each SRS
Sample Prep / water source
Explanation of Statistics
Compiled list of MPVs
Sample Statistics
Major (M-248)
Alkalinity as CaCO3
Boron
Bromide
Calcium
Chloride
Fluoride
Magnesium
pH
Potassium
Residue on Evaporation
Silica
Sodium
Specific Conductance
Strontium
Sulfate
Total Phosphorus as P
Vanadium
Trace (T-255)
Aluminum
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmium
Calcium
Cerium
Chromium
Cobalt
Copper
Dysprosium
Erbium
Europium
Gadolinium
Holmium
Iron
Lanthanum
Lead
Lithium
Lutetium
Magnesium
Manganese
Molybdenum
Neodymium
Nickel
Potassium
Praseodymium
Promethium
Samarium
Scandium
Selenium
Silica
Silver
Sodium
Strontium
Terbium
Thallium
Thulium
Tungsten
Uranium
Vanadium
Ytterbium
Yttrium
Zinc
Mercury (Hg-77)
Mercury
Precipitation (P-81)
Calcium
Chloride
Fluoride
Magnesium
Orthophosphate as P
pH
Potassium
Sodium
Specific Conductance
Sulfate
Nutrient (low) (N-159)
Ammonia + Organic Nitrogen as N
Ammonia as N
Nitrate as N
Nitrite + Nitrate as N
Orthophosphate as P
Total Nitrogen
Total Phosphorus as P
Nutrient (high) (N-160)
Ammonia + Organic Nitrogen as N
Ammonia as N
Nitrate as N
Nitrite + Nitrate as N
Orthophosphate as P
Total Nitrogen
Total Phosphorus as P
Individual Laboratory Performance
Lab # 1
Lab # 8
Lab # 10
Lab # 12
Lab # 16
Lab # 23
Lab # 26
Lab # 31
Lab # 38
Lab # 42
Lab # 45
Lab # 46
Lab # 50
Lab # 59
Lab # 64
Lab # 72
Lab # 76
Lab # 80
Lab # 89
Lab # 90
Lab # 91
Lab # 105
Lab # 110
Lab # 118
Lab # 138
Lab # 142
Lab # 147
Lab # 180
Lab # 193
Lab # 198
Lab # 205
Lab # 219
Lab # 234
Lab # 246
Lab # 297
Lab # 298
Lab # 307
Lab # 313
Lab # 316
Lab # 318
Lab # 319
Lab # 321
Lab # 373
Lab # 374
Lab # 377
Lab # 379
Lab # 384
Lab # 388
Lab # 390
Lab # 397
Lab # 410
Lab # 420
Lab # 421
Lab # 423
Lab # 433
Lab # 438
Lab # 443
Lab # 453
Lab # 538
Lab # 540
Lab # 550
Lab # 551
Lab # 552
Lab # 562
Lab # 565
Lab # 571
Lab # 575
Lab # 577
Lab # 579
Lab # 580
Lab # 582
Lab # 585
Lab # 587
Lab # 588
Lab # 589
Lab # 590
Lab # 591
Lab # 593
Lab # 598
Lab # 599
Lab # 601
Lab # 604
Lab # 609
Lab # 612
Lab # 615
Lab # 616
Lab # 623
Lab # 625
Lab # 626
Lab # 627
Lab # 628
![[US Geological Survey]](/srs_study/images/usgsid.gif)
