[US Geological Survey]

Standard Reference Sample Project

Please log in to order samples or enter sample data:

Username:  
Password:
 

Your username is the lab ID number assigned to you and is entered as lab# (no space); where # is your lab ID number. Your password is entered without spaces and all lower case.

After login, samples may be ordered for the inter-laboratory comparison (call 303-236-1875 for previously made SRS's). Samples cost $48 each ($70 after deadline). Sample results are to be entered before the deadline stated or they will not be included in the final reports. "Ratings" will no longer be determined. A laboratories performance will be judged by the number of deviations (z-values) their reported values are from the median (MPV) and the percent difference.

STANDARD REFERENCE SAMPLE TYPES -  
Trace element sample: chlorinated with sodium hypochlorite and acidified with nitric acid
Major ion sample: chlorinated with sodium hypochlorite
Precipitation (low ionic-strength) sample: typically non-preserved snowmelt
Nutrient (low concentration) sample: concentrations <0.5 mg/L
Nutrient sample: concentrations >0.5 mg/L
Mercury sample: concentration <0.1 µg/L; preserved with hydrochloric acid

 

Trace Sample
Major Sample
Precipitation Sample
Silver (µg/L)
Alkalinity (mg/L)
Calcium (mg/L)
Aluminum (µg/L)
Boron (µg/L)
Chloride (mg/L)
Arsenic (µg/L)
Bromide (mg/L)
Fluoride (mg/L)
Boron (µg/L)
Calcium (mg/L)
Potassium (mg/L)
Barium (µg/L)
Chloride (mg/L)
Magnesium (mg/L)
Beryllium (µg/L)
Residue on Evaporation (mg/L)
Sodium (mg/L)
Calcium (mg/L)
Fluoride (mg/L)
pH
Cadmium (µg/L)
Potassium (mg/L)
Orthophosphate as P (mg/L)
Cobalt (µg/L)
Magnesium (mg/L)
Sulfate (mg/L)
Chromium (µg/L)
Sodium (mg/L)
Specific Conductance (µS/cm)
Copper (µg/L)
Phosphorus as P (mg/L)
Iron (µg/L)
pH
Potassium (mg/L)
Silica (mg/L)
Mercury Sample
Lithium (µg/L)
Sulfate (mg/L)
Mercury (µg/L)
Magnesium (mg/L)
Specific Conductance (µS/cm)
Manganese (µg/L)
Strontium (µg/L)
Molybdenum (µg/L)
Vanadium (µg/L)
Nutrient Sample
Sodium (mg/L)
Ammonia as N (mg/L)
Nickel (µg/L)
  
Ammonia + Org N as N (mg/L)
Lead (µg/L)
Nutrient (low conc.) Sample
Nitrate as N (mg/L)
Antimony (µg/L)
Ammonia as N (mg/L)
Nitrite + Nitrate as N (mg/L)
Selenium (µg/L)
Ammonia + Org N as N (mg/L)
Phosphorus as P (mg/L)
Silica (mg/L)
Nitrate as N (mg/L)
Orthophosphate as P (mg/L)
Strontium (µg/L)
Nitrite + Nitrate as N (mg/L)
Total Nitrogen as N (mg/L)
Thallium (µg/L)
Phosphorus as P (mg/L)
  
Uranium (µg/L)
Orthophosphate as P (mg/L)
  
Vanadium (µg/L)
Total Nitrogen as N (mg/L)
  
Zinc (µg/L)