This research showed the feasibility of using a custom designed
and fabricated test stand based on automatic electrode rinsing and
data collection for obtaining data from an ISE array. Test stand data
from NO3 and K membrane-based electrodes, adjusted with baseline
correction and two-point normalization methods, provided
good estimates of NO3 and K in hydroponic solution. Results with
the Ca electrode were not satisfactory due to its reduced sensitivity
and poor selectivity for Ca in the mixed hydroponic solution.