[US Geological Survey]

Standard Reference Sample Project

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STANDARD REFERENCE SAMPLE TYPES -  
Trace element sample: chlorinated with sodium hypochlorite and acidified to pH<2 (0.4% HNO3)
Major ion sample: chlorinated with sodium hypochlorite
Precipitation (low ionic-strength) sample: unpreserved snowmelt
Nutrient (low concentration/odd numbered) sample: unpreserved, keep at 4°C,
requires 1:10 dilution prior to analysis, report result from diluted aliquot
Nutrient sample (normal concentration/even numbered): unpreserved, keep at 4°C
Mercury sample: concentration <0.1 µg/L, preserved with 0.4% HCl

 

Trace Sample
Scandium (µg/L)
pH
Silver (µg/L)
Yttrium (µg/L)
Silica (mg/L)
Aluminum (µg/L)
Lanthanum (µg/L)
Sulfate (mg/L)
Arsenic (µg/L)
Cerium (µg/L)
Specific Conductance (µS/cm)
Boron (µg/L)
Praseodymium (µg/L)
Strontium (µg/L)
Barium (µg/L)
Neodymium (µg/L)
Vanadium (µg/L)
Beryllium (µg/L)
Promethium (µg/L)
  
Calcium (mg/L)
Samarium (µg/L)
Precipitation Sample
Cadmium (µg/L)
Europium (µg/L)
Calcium (mg/L)
Cobalt (µg/L)
Gadolinium (µg/L)
Chloride (mg/L)
Chromium (µg/L)
Terbium (µg/L)
Fluoride (mg/L)
Copper (µg/L)
Dysprosium (µg/L)
Potassium (mg/L)
Iron (µg/L)
Holmium (µg/L)
Magnesium (mg/L)
Potassium (mg/L)
Erbium (µg/L)
Sodium (mg/L)
Lithium (µg/L)
Thulium (µg/L)
pH
Magnesium (mg/L)
Ytterbium (µg/L)
Orthophosphate as P (mg/L)
Manganese (µg/L)
Lutetium (µg/L)
Sulfate (mg/L)
Molybdenum (µg/L)
  
Specific Conductance (µS/cm)
Sodium (mg/L)
Major Sample
 
Nickel (µg/L)
Alkalinity (mg/L)
Mercury Sample
Lead (µg/L)
Boron (µg/L)
Mercury (µg/L)
Antimony (µg/L)
Bromide (mg/L)
  
Selenium (µg/L)
Calcium (mg/L)
Nutrient Samples
Silica (mg/L)
Chloride (mg/L)
Ammonia as N (mg/L)
Strontium (µg/L)
Residue on Evaporation (mg/L)
Ammonia + Org N as N (mg/L)
Thallium (µg/L)
Fluoride (mg/L)
Nitrate as N (mg/L)
Tungsten (µg/L)
Potassium (mg/L)
Nitrite + Nitrate as N (mg/L)
Uranium (µg/L)
Magnesium (mg/L)
Phosphorus as P (mg/L)
Vanadium (µg/L)
Sodium (mg/L)
Orthophosphate as P (mg/L)
Zinc (µg/L)
Phosphorus as P (mg/L)
Total Nitrogen as N (mg/L)