Hanna’s liquid membrane combination ISEs are designed with a cone style junction. The skirted cone geometry of the sensor forms the liquid junction with the test solution at the tip of the junction cone, producing a highly stable reference potential and consistent flow rates of electrolyte into the solution. A simple press of the top portion of the ISE makes it easy to empty the electrolyte fill solution and replace when necessary.
For the HI4114 to measure potassium accurately, it is important that the ionic strength of the standards and sample be adjusted to a high and constant value with the potassium ionic strength adjuster (ISA) solution. The ISA ensures that the activity coefficient is constant so the concentration of free potassium ions can be measured. Measuring all solutions with a constant ionic strength reduces the margin of error between measurements. The HI4114 potassium liquid membrane ISE can measure from 1µM (0.039 mg/L) to 1M (39,100 mg/L).
Conversion Table for K+
| Multiply | |
moles/L (M) to ppm (mg/L) | 39100 |
ppm (mg/L) to M (moles/L) | 2.56 x 10-5 |
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