**Calcium** |

Fluka calcium ionophore I-Cocktail A. It has the following selectivity values determined by the fixed interference method: |

log *K*_{CaNa}^{Pot} | −5.5 |

log *K*_{CaK}^{Pot} | −5.4 |

log *K*_{CaMg}^{Pot} | −4.9 |

Electrode function: Slope of the linear regression is 28.1 +/− 1.8mV (10^{−2} to10^{−7} CaCl_{2} determined in calcium buffered solutions at a constant background of 125mM K^{+}). With a tip diameter between 1–2μm the expected resistance is in the range of 2×10^{10} Ω. Data from Fluka (1996). In our applications with larger tips(2–4μm) and short column lengths (30μm) we record a resistance of 2 3×10^{9} Ω . Response times evaluated at the BRC give a mean value of 48ms to 90% response (see below) |

**Chloride** |

Fluka chloride ionophore 1-Cocktail A. It has the followings electivity factors as determined by the separate solution method: |

log *K*_{ClHCO3}^{Pot} | −1.5[31] |

| −0.9[32] |

log *K*_{ClAcetate}^{Pot} | −1.3[31] |

| −1.2[32] |

log *K*_{CIGlutamate}^{Pot} | −3.2[32] |

log *K*_{CIGlutamate}^{Pot} | −3.0[32] |

log *K*_{ClCitrate}^{Pot} | −1.6[32] |

log *K*_{ClThiosulfate}^{Pot} | −0.8[32] |

log *K*_{ClSO4}^{Pot} | −2.6[31] |

log *K*_{ClSCN}^{Pot} | 3.4[31] |

log *K*_{ClSalicylate}^{Pot} | 3.0[31] |

Electrode function: Slope of the linear regression is 57.5+/−0.5 mV (0.001–0.5 *M* NaCl on 0.01*M* Tris/H_{2}SO_{4}, pH 7.4). The resistance for an approximately 1 μm tip will be in the region of 7×10^{10} Ω. These data are taken from [31]. The 90% response time is given as 1.8s [32] |

**Hydrogen** |

Fluka hydrogen ionophore 1-Cocktail B. It has the followings electivity factors determined by the fixed interference method: |

log *K*_{HNa}^{Pot} | −10.4 |

log *K*_{HK}^{Pot} | −9.8 |

log *K*_{HCa}^{Pot} | < −11.1 |

Electrode function: Slope of the linear regression is 58.0+/−0.4mV pH range5.5–12.0. The resistance for an approximately1 μm tip will be in the region of 1×10^{11}Ω. These data are taken from [31] |

Response times evaluated at the BRC give a mean value of 88ms to90%. |

**Potassium** |

This cocktail has the following selectivity values based on the separate solution method: |

log *K*_{KLi}^{Pot} | −4.2 |

log *K*_{KNa}^{Pot} | −3.9 |

log *K*_{KMg}^{Pot} | −4.6 |

log *K*_{KCa}^{Pot} | −4.9 |

log *K*_{KAcetylcholine}^{Pot} | −4.9 |

Electrode function: Slope of the linear regression is 58.8 +/− 1.2 mV (20°C:10^{−4} to10^{−1}). The detection limit of this ionophore is given as log *a*_{K} = −5.0 against 140 mM Na^{+}. These data are from [31]. The response time to 95% is 41 77 ms depending on the change in concentration [14] |

**Cadmium** |

These data are taken from Pineros et al. (1996). Reference should be made to this paper for ISE preparation and testing. Selectivity based on the separate solutions method: |

log *K*_{CdZn}^{Pot} | −2.9 |

log *K*_{CsPb}^{Pot} | −4.6 |

log *K*_{CdCu}^{Pot} | −4.8 |

log *K*_{CdMn}^{Pot} | −5.2 |

log *K*_{CdFe}^{Pot} | −8.6 |

log *K*_{CdNi}^{Pot} | −10.4 |

log *K*_{CdCa}^{Pot} | −10.8 |

log *K*_{CdMg}^{Pot} | −12.2 |

log *K*_{CdNH4}^{Pot} | −6.2 |

log *K*_{CsNa}^{Pot} | −7.1 |

log *K*_{CdK}^{Pot} | −7.9 |