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Potassium Ion Selective Electrode,Combo, Replaceable Membrane, DJ

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Price:
$369.00
SKU:
NavK-BNC
Brand:
Weight:
2.00 LBS
Availability:
MAX 3-5 BUSINESS DAYS
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Calculated at checkout
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Product Description

 

With a BNC connector compatible with almost all meters, our Ion-Selective Electrodes (ISEs) are double junction combination electrodes and do not require an external reference electrode.  Potassium is a PVC type ISE, Refillable, Double Junction electrode with a replaceable membrane. With an epoxy body and the great performance it provides, it's a great value. 

 

SPECIFICATIONS:

Sensor Type:

PVC membrane type (special, potassium-selective iopnophores are added to a liquefied PVC matrix and then allowed to gel or harden)

Measurement Range:

0.00001M to 1M (10-6M to 1M)

0.04ppm to 39,000ppm

pH Range:

This ISE performs best when the pH is between 2.5 and 11 since hydrogen and hydroxide ions can interfere

Temperature Range:

It is best to use this electrode at 25ºC but it will perform well if calibration standards and samples are near the same temperature. It should not be used outside of the range 0-40 ºC.

Electrode Slope:

This electrode has an ideal slope of 59mV per 10-fold (decade) change in concentration but is typically lower than that. A slope from 55-60 mV/Decade is typical.

Voltage Range:

ISE meters that allow for -1999 to 1999 mV typically work well with this and other ISEs (Similar voltage properties to the existing ammonium ISE)

Electrode Resistance:

 

Reproducibility:

±2% is feasible with good laboratory procedure

Minimum sample size:

As long as the Reference Junction and the Sensor are immersed in the sample, it should be able to make a measurement. If a small sample container like a test tube is used, this can be as little as 1 mL but if a 25ml beaker is used, you may need as much as 5-10mL to cover the reference junction and the sensor.

Interferences:

These ions, when present in solution while measuring Potassium (K+) with an ISE could cause higher than actual readings per the following table.

 

Interferent concentration (Moles/L) causing 10% Error

K+ Range

~10-4 M

~10-3 M

~10-2 M

H+

1 x 10-3

1 x 10-2

0.1

Na+

0.2

2.0

20

Cs+

3 x 10-5

3 x 10-4

3 x 1 0-3

NH4+

6 x 10-4

6 x 10-3

6 x 10-2

Ag+

0.1

1.0

10

Tris+

0.1

1.0

10

Li+

0.2

2.0

20

 

Example: If you are measuring Potassium in the 10-3 Molar Range, and Sodium (Na+) is present at a level of 2.0 Moles/Liter, then your measured results could be showing about 10% high.


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