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DUROmaster hardness tester

The New DUROmaster range of pocket durometers allow reliable hardness determinations to be made quickly and effectively. They are available in two versions, Shore A & Shore D, for the measurement of plastic, rubber and similar materials. Incorporating a clear visible display and a rubber hand grip for ease of use the ... more

 Chloride Anayzer
Home : Our Principals : SHERWOOD SCIENTIFIC : Chloride Anayzer

Model 926 Chloride Analyser

The Sherwood Model 926 is used for the determination of chloride ions. It is an instrumental analogue of "Argentimetry", the traditional titrimetric methods using silver nitrate reagent. Like these classic methods it relies on the chemical formation of the very insoluble salt, silver chloride.

The importance of chloride determination has been realized for well over a century, with many variations and changes being made to the techniques in order to improve the detectability and selectivity. Research into the analysis of chloride was conducted by Gay-Lussac (1832), Levol (1853), Mohr (1856) and Volhard(1874) and their findings have proven to be the basis of the methods which are still in common use today.

KEY APPLICATION AREAS

The measurement of Salt (Sodium Chloride) concentration in the Food and Dairy Industry is universal. The ability to read direct in Salt concentration makes the SHERWOOD Model 926 the instrument of choice for manufacturers and food analysts around the world.

Salt and salinity also represents serious contamination in Industrial processes and the sensitivity of the coulometric method enables measurement in the ppm range in boiler feed water, polymer washes. bore hole slurries, as well as soils analysis and others. The 926 has proven itself to be the method of choice for many desalination studies and general quality control of sample lines.

Clinical measurement of the chloride ion is essential for monitoring of electrolyte balance of patients as it plays, in combination with sodium and potassium, an important part in maintaining water balance between cells, plasma and interstitial fluid. The Model 926s is also widely used in the confirmation of the diagnosis of Cystic Fibrosis. The model 926S variant can accept 20 microlitre samples.

Sherwood Scientific has method notes for these and other Applications. Pharmaceutical Production, Cement Manufacture, Photography Veterinary.


PRINCIPLES OF METHOD

The main difficulties with the classic method were that silver nitrate reagent would change on storage due to a photochemical reaction and that the titration end point is visually weak. The reagent would have to be standardized requiring a highly skilled analytical technician

The 926 method is based on a coulometric titration and is an absolute method where the reagent, the silver ions, is precisely and quantitatively generated at the time of the analysis by passing a constant current between donor electrodes. The end point is detected by the use of sensing electrodes which measure the change in solution conductivity which occurs when excess silver ions are present in solution.

Specification

Model 926

Model 926S

Sample size

500 microlitres

20 microlitres

Readout Range

10-999mg Cl/l; 2-165mg%Salt

10-299mmolCl/l

Analysis Time

35 sec @ 200mgl/l

35 sec@ 100mmolCl/l

Accuracy

SD <1% @ 0.1% Cl Std Solution

+-2% @ NQCS 100mmol/l

Linearity

1% in range 10-999mgCl/l

1% 10-299 mmolCl/l

Reproducibility CV for 20 replicates

<1.5% @ 200mgCl/l

<1.5% @ 100mmolCl/l

REAGENT SYSTEM

The Sherwood Buffer system is optimised to eliminate interfering ions and incorporates a special dispersant to ensure reproducible formation of the silver chloride precipitate and enhance analytical performance.


The Sherwood Advantage

    • The coulometric method is very robust and versatile

    • The Sherwood microprocessor based Instrument is ergonomically designed and easy to use and maintain

    • The Sherwood Buffer System specifically designed for the model 926 gives outstanding sensitivity and selectivity

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Chloride Anayzer
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PT. PROLABMAS MURNI SWADAYA
Sentra Niaga Puri Indah Blok T3-10
Jakarta 11610 - Indonesia
Telp: +62 (21) 581 8000, 581 9000
Fax: +62 (21) 581 6999
 
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