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pH Laboratory Electrodes

Cole-Parmer®

Cole-Parmer® Replaceable Membrane Ion-Selective Electrodes

Don't throw it away—replace worn membranes quickly

– Save money by simply replacing membrane—no need to remove other components

– No need to buy additional electrodes—change out membrane to sense a different ion

These double-junction combination electrodes require no external reference. Electrodes are refillable with an outer silver-free reference fill, and include BNC connector with 3-ft (0.9-m) cable. Contact our Application Specialists if you need an electrode not shown below.

Electrodes with PVC Membranes include one sensing module (in place), reference fill solution, and internal fill solution.

Electrodes with Solid-State Membranes include one sensing module (in place), polishing strips, and reference fill solution.

Replacement PVC Membrane Kits include three membranes, a set of O-rings, polishing strips, internal fill solution, and reference solution.

Replacement Solid-State Membrane Kits include three billets, a set of O-rings, polishing strips, and reference fill solution.

Solution Kits contain one pipette, one 60-mL bottle of filling solution, one 475-mL bottle of 1000 ppm standard solution, and one 475-mL bottle of ionic strength adjuster (1-gal. bottle for 27502-69).

Ion Concentrationrange

Temp/pH range† Interferences‡

Ion-selective electrode Repl. membrane kits Solution kits

Catalognumber Price Catalog

number PriceFormulations for

fill/ standard solutions

Ionic strength adjuster

formulation

Catalognumber Price

Electrodes with PVC membranesAmmonium

(NH4+)

5 x 10–6 to 1.0 M(0.1 to 18,000 ppm)

0 to 50°C/4 to 10 K+ GH-27505-00 GH-27505-50 0.1 M NaCl/

1000 ppm as N 5 M NaCl GH-27502-53

Calcium (Ca+2)

5 x 10–6 to 1.0 M(0.2 to 40,000 ppm)

0 to 50°C/3 to 10

Pb+2, Hg+2, Cu+, Ni+2 GH-27505-06 GH-27505-56 4 M KCl/

1000 ppm as Ca+2 4 M KCl GH-27502-59

Nitrate (NO3

–)7 x 10–6 to 1.0 M

(0.5 to 62,000 ppm)0 to 50°C/2.5 to 11

ClO4–, I–, CN–,

BF4–, CI–, NO2

GH-27505-12 GH-27505-62 0.1 M (NH4)2SO4/1000 ppm as NO3

– 2 M (NH4)2SO4 GH-27502-79

Potassium (K+)

10–6 to 1.0 M(0.04 to 39,000 ppm)

0 to 50°C/2 to 12 Cs+, NH4

+ GH-27505-24 GH-27505-74 0.1 M NaCl/1000 ppm as K+ 5 M NaCl GH-27502-89

Electrodes with solid-state membranesBromide

(Br–)5 x 10–6 to 1.0 M

(0.4 to 79,900 ppm)0 to 80°C/

2 to 14 S–2, I–, CN–,

high Cl–, NH+3

GH-27506-00 GH-27506-50 1 M KNO3/1000 ppm as Br– 5 M NaNO3 GH-27502-55

Chloride (Cl–)

5 x 10–5 to 1.0 M 1.8 to 35,500 ppm)

0 to 80°C/2 to 12 S–2, I–, CN–, Br– GH-27506-12 GH-27506-62 1 M KNO3/

1000 ppm as Cl– 5 M NaNO3 GH-27502-63

Copper (Cu+2)

10–8 to 10–1 M(0.0006 to 6350 ppm)

0 to 80°C/2 to 12

Ag+, Hg+2, high Cl–, Br–, Fe+2, Cd+2

GH-27506-18 GH-27506-68 1 M KNO3/1000 ppm as Cu+2 5 M NaNO3 GH-27502-65

Cyanide††

(CN–)5 x 10–6 to 10–2 M(0.1 to 260 ppm)

0 to 80°C/11 to 13 S–2, I–, Br–, Cl– GH-27506-24 GH-27506-74 — — —

Fluoride (F–)

10–6 to saturated(0.02 to saturated)

0 to 80°C/5 to 8 OH– GH-27506-30 GH-27506-80 4 M KCl/

1000 ppm as F – TiSAB I GH-27502-69

†Optimal pH range for direct measurement. ‡These ions are listed in order of decreasing concentrations of interference. ††Customer-formulated standard solution required.

Orion™ High-Performance Ammonia Ion-Selective Electrode

Easy maintenance—no more overfilling

– No need to disassemble electrode to fill or monitor solution

– Don't overfill electrode with easy-to-read fill line

– Compliant with EPA testing method for ammonia measurement

– Extremely durable with a chemical-resistant, translucent body

What’s included: 20 loose membranes, preassembled electrode body with membrane, 60 mL of filling solution, and 3.3-ft (1-m) cable with BNC connector.

GH-05730-31 Ammonia standard, 0.1 M NH4Cl, 475-mL bottle GH-05730-32 Ammonia standard, 1000 ppm ammonia as nitrogen, 475-mL bottle GH-05730-51 Ionic strength adjustor, NaOH and EDTA, 475-mL bottle GH-05730-44 Ionic strength adjustor, low-level, NaOH, 475-mL bottle

Type Concentration range Temperature/pH range Interferences Catalog number PriceGas sensing 5 x 10–7 to 1.0 M (0.01 to 17,000 ppm) 0 to 50°C/above 11 Volative amines GH-05722-18

Accessories

GH-05722-22 Ammonia electrode filling solution, 60-mL bottle GH-05722-24 Replacement membranes. Pack of 20 GH-05722-26 Replacement preassembled body and membrane. Pack of 3