在线钠离子监测仪

在线钠离子监测仪 

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SODIUM

One of the accepted methods for the measurement of sodium is an electrode method. The advantages of using a sodium ion selective electrode are:

• Analysis method is straightforward
• Results not affected by color or turbidity
• Response is fast
• Interferences are eliminated by the use of the single known addition process.

Sentinel

Tytronics’ Sentinel is an on-line ISE analyzer that measures sodium using an ion selective electrode. The instrument uses a batch sampling technique that allows the use of 0.25" tubing for sample and reagent lines so small amounts of solids will not affect instrument performance. Other advantages of batch sampling are:

• Analytical results are not affected by sample and reagent flows
• Analyses are only performed as frequently as required, minimizing reagent consumption

ANALYSIS -

The Sentinel uses a known addition measurement technique, which provides more consistent results than a direct electrode measurement. In the instrument, 19 ml of sample is captured, ammonium chloride diluted with de-ionized water is added, and then an aliquot of standard is added to the sample. From the change in potential before and after the addition, the original sample concentration is determined.

METHOD

The advantage of the known addition technique is that electrode drift will not affect the instrument results. Electrode slope is automatically determined by using a standard of known concentration and performing a single known addition on the standard. Instrument accuracy is insured through the use of the known addition technique (SKA) and automatic slope determination. 

FEATURES:

• Duplicates, on-line, the laboratory method (ISE electrode)
• Adds reagent to alleviate problems due to sample pH fluctuations
• Utilizes single known addition technique so results are not affected by electrode drift
• Provides automatic slope calibration