Specifications of Ion Selective Electrodes

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These specifications apply to the ion selective electrodes:

  • ET1601 MINI Ion Selective Electrodes
  • ET1632 Modular Single Ion Selective Electrode
  • ET1615 Modular Ion Selective Electrode Inserts


Ion Slope (mV/dec) Lineal Range pH Response Time Working Temperature (°C) Interferences (log Kij)
Ammonium 54±5 0.09 to 9000 mg/L 4 to 8.5 < 1 min 5 to 50 K (-0.8); Na (-2.7)
NH4+ 5e-6 to 0.5 mol/L Mg (-3.2); Ca (-4)
Bromide -54±5 0.4 to 8000 mg/L 1 to 12 < 1 min 5 to 50 Error in presence of Ag, S, I or CN
Br- 5e-6 to 0.1 mol/L Cl (-2.7); OH (-4.5)
Calcium 24±5 0.4 to 4000 mg/L 3.5 to 8 < 1 min 5 to 50 NH4 (-3); K (-3.6)
Ca2+ 1e-5 to 0.1 mol/L Na (-3.7)
Cyanide -54±5 0.1 to 250 mg/L 11 to 14 < 1 min 5 to 50 Error in presence of Ag or S
CN- 4e-6 to 0.01 mol/L same selectivity for I-
Chloride -54±5 1.5 to 35000 mg/L 2 to 12 < 1 min 5 to 50 Error in presence of Ag or S
CI- 4e-5 to 1 mol/L Irreversible damage to membrane
Copper 24±5 0.06 to 3200 mg/L 2 to 7 < 1 min 5 to 50 Error in presence of Ag, Cl or S
Cu2+ 1e-6 to 0.05 mol/L Alterations presence or I
Fluoride -54±5 0.1 to 1900 mg/L 4 to 8 < 1 min 5 to 50 OH (-1)
F- 5e-6 to 0.1 mol/L Maintain pH < 8
Iodide -54±5 0.1 to 12000 mg/L 2 to 12 < 1 min 5 to 50 Error in presence of Ag or S
I- 1e-6 to 0.1 mol/L Br (-3.4); Cl (-6)
Lithium 54±5 0.1 to 5000 mg/L 2 to 12 < 1 min 5 to 50 Na (-2.3); K (-2.4)
Li+ 1e-5 to 0.7 mol/L H (-3)
Magnessium 24±5 2.4 to 2400 mg/L 3 to 8.5 < 1 min 5 to 50 Ca (-1); K (-3.6)
Mg2+ 1e-4 to 0.1 mol/L Na (-3.9)
Nitrate -54±5 0.6 to 31000 mg/L 2 to 11 < 1 min 5 to 50 Br (-1.2); NO2 (-1.7)
NO3- 1e-5 to 0.5 mol/L OH (-1.8); AcO (-2.2)
Nitrite -54±5 2.5 to 1000 mg/L 4 to 8 < 1 min 5 to 50 SCN (-0.2); I (-2.2)
NO2- 5.4e-5 to 0.02 mol/L ClO4 (-2.4); Br (-3.3)
Perchlorate -54±5 1 to 10000 mg/L 1 to 11 < 1 min 5 to 50 SCN (-1.7); NO3 (-1.7)
ClO4- 1e-5 to 0.1 mol/L I (-1.7)
Silver 56±5 0.1 to 10000 mg/L 1 to 9 < 1 min 5 to 50 Error in presence of S or Hg
Ag+ 1e-6 to 0.1 mol/L
Potassium 54±5 0.4 to 3900 mg/L 1 to 9 < 1 min 5 to 50 NH4 (-2.1); Ca (-3.9)
K+ 1e-5 to 0.1 mol/L Li (-4.3); Na (-4.6)
Sodium -27±5 0.1 to 3200 mg/L 1 to 9 < 1 min 5 to 50 K (-2.5); Ca (-3)
Na+ 3e-6 to 0.1 molL Li (-3.2)
Sulfide -54±5 0.4 to 8000 mg/L 12 to 14 < 1 min 5 to 50 Error in presence of Ag or Hg
S2- 5e-6 to 0.1 mol/L


Slope (mV/dec) = slope of the calibration line (mV/decade of concentration); 54 for monovalent ions and 27 for divalent ions

pH = working pH range