Soil

 

Salinity and Ph

Analyte Method Analysis
pH 1:1  or 1:2 deionized water:media pH meter
Saturated paste  pH meter
Sodium adsorption ration Saturated paste  ICP-OES
Salinity Electrical conductivity (1:1 deionized water:media) Electrical conductivity meter

Total Elemental Analysis

Analyte Method Analysis
Multi-element XRF  USEPA 6200 X-ray fluorescence
Multi-element XRF (Screen) n/a X-ray fluorescence
Acid digestion USEPA 3051a ICP-OES

Nutrient Analysis

Analyte Method Analysis
Extractable K, Ca, Mg, Na Soil pH > 7.2:  ammonium acetate ICP-OES
Soil pH < 7.2: Mehlich 3  ICP-OES
Extractable P Soil pH >7.2: Olsen (sodium bicarbonate) ICP-OES
Soil pH < 7.2: Mehlich 3  ICP-OES
Soil pH < 7.2: Olsen P  ICP-OES
Extractable Fe, Zn, Cu, Mn Soil pH > 7.2: DTPA   ICP-OES
Soil pH < 7.2: Mehlich 3  ICP-OES
Al, Fe Acid ammonium oxalate  ICP-OES
Plant available N 2M KCl (NH4+NO3) Colorimetric flow injection analysis

Carbon and Nitrogen

Analyte Method Analysis
Total carbon and nitrogen Dry combustion Carbon nitrogen analyzer
Active carbon Potassium permanganate oxidation Colorimetric
Organic carbon Dichromate reduction Colorimetric
Total carbon    Loss on Ignition Gravimetric

Heavy Metals

Analyte Method Analysis
Human gastrointestinal bioaccessible Pb: Untreated soil USEPA 1340 ICP-OES
Human gastrointestinal bioaccessible Pb: Treated soil Modified USEPA 1340 at pH 2.5 ICP-OES
OSU In Vitro Gastrointestinal method (OSU IVG) ICP-OES
Mammal, avian gastrointestinal bioaccessible Pb modified USEPA 1340 at pH 2.5 ICP-OES
OSU In Vitro Gastrointestinal method (OSU IVG) ICP-OES
Plant bioaccessible Pb Neutral salt extraction (2M KCl) ICP-OES
Bioassay Biological tissue digest and ICP-OES
Human gastrointestinal bioaccessible As USEPA 1340 ICP-OES
OSU In Vitro Gastrointestinal method (OSU IVG) ICP-OES
Human gastrointestinal bioaccessible As, high Fe soils California Arsenic Bioaccessibility method (CAB) ICP-OES
Toxicity characteristic leaching procedure USEPA 1311 ICP-OES
Synthetic precipitation leaching procedure USEPA 1312 ICP-OES