UVM Agricultural and Environmental Testing Lab
Plant and Soil Science Department
219 Hills Bldg. 1/6/2000
Anion Method for Groundwater Analysis using a Dionex 2010I Automated Ion Chromatograph
1. The instrument was switched on and allowed to prime itself with diluent and buffer solutions for 10 minutes prior to calibration and analysis. All samples were stored in a refrigerator prior to analysis.
2. 5ml aliquots of High, Medium, and Low calibration standard solutions were placed in the first 3 tubes in sequence for calibration of the instrument and subsequent analysis of the unknown water samples. The instrument is re-calibrated every 12 samples.
Concentrations of standards are as follows: High Medium Low
Cl- mg/L 10 5 1
NO3-N 6.77 3.39 0.68
SO4-S 6.67 3.33 0.67
PO4-P 5 2.5 0.5
SO4-S 10x and 50x
NO3-N and PO4-P generally did not need to be diluted, as they were often found to be below the lowest standard.