Polarography - Voltammetry System with PC support

Model 4000 Polargraphic/Voltammetry System

  • Compact portable easy to use system
  • High accuracy and short analysis time
  • Performs all typical voltametric and polargraphic analysis
  • DC Polarography
  • DC Stripping Voltammetry
  • Adsorptive Stripping Voltammetry
  • Differential Pulse Polarography
  • Cyclic Voltammetry
  • Very low Hg consumption
  • Complete methods handbook included
  • Includes software for operation with a PC

Introduction

polarography field kit

polarography voltammetryThe TE 4000 is an easy to use, computer operated electrochemical system for polarography, voltammetry and Amperometry. The unit is very compact and can easily be used in the field in conjuction with a laptop PC via the USB interface.
The sensitivity of the instrument is comparable with AAS and in many cases it is even better. The system is delivered with a 100 plus page booklet of methods.

Polarography is a technique in which an electric potential (or voltage) is varied in a regular manner between two or three electrodes (working, reference, and auxiliary) while the current is monitored. The working electrode can be solid (gold, platinum or glassy carbon) or formed by a drop of mercury hanging from a tip of a capillary. If the electrode is formed by a drop of mercury rhythmically dropping from a capillary, the analytical technique is called Polarography. At a specific potential oxidation or reduction of the analyte occurs, which causes an increase of the current which depends on the concentration of the analyte. The shape of a polarogram depends on the method of analysis selected, the type of working electrode used, and the potential ramp that is applied.

Most common techniques are DC (Direct Current, linear sweep) and DP (Differential Pulse, linear
sweep with pulses superimposed). Classical polarography uses a dropping mercury electrode, which causes a high consumption of mercury. Modern Instruments such as the TEA 4000 work with a hanging mercury drop, which minimizes the mercury consumption, and enables “Stripping Voltammetry”.

Stripping voltammetry means, that the analyte is ccumulated in a first step at the surface of the working electrode. To do so an appropriate accumulation potential is applied to the electrode for a defined time intervall (accumulation time). The analyte is then stripped back into the solution in a second step. The enrichment of the analyte effects the high sensitivity.
The most sensitive methods are anodic, cathodic and adsorptive stripping voltammetry, combined with the differential pulse technique. The detection limits using stripping voltammetry depends on the analyte, the best detection limits are about 0,01 μg/l (ppb).

Applications

TheT 4000 polarography / voltammetry system is suitable for use in the laboratory or on site in many fields of application including: water analysis of natural, waste and fresh water; food and beverage, sanitation, environmental analysis, pharmaceutical, chemical, oil and plating industries, medicine, biology, geology and tribometry. The instrumentation is supplied with a comprehensive manual of analytical methods.

Zn Cd Pb Cu
The example above shows the simultaneous determination of Zn , Cd, Pb and Cu using standard addition

Electrodes


A selection of electrodes are available depending on the application including :

  • Gold Electrodes for the determination of mercury, and arsenic and for the use of an Hg film
  • HMDE Hanging mercury drop electrode with a minimum of < 1.5 mL/ year of Hg consumption.
  • Glassy carbon electrode for the use of Hg film ( MFE ).
Electrodes

Detection Limits in the ultra trace range

Al 3 ppb Cu 0.05 ppb Pb 0.05 ppb Zn 0.05 ppb As 0.1 ppb Fe3+ 0.03 ppm Cl 1 ppb
Ag 1 ppb Hg 0.03 ppb Mo 0.05 ppb As3+ 0.1 ppb Mn 0.5 ppb NO3- 0.05 ppm PO4 2- 20 ppm
Cd 0.05 ppb Cr4+ 0.01 ppb Pd 0.01 ppb Co 0.01 ppb Fe 0.03 ppm NO2- 0.01 ppm SO4 2- 20 ppb
Cr 0.01 ppb Ni 0.01 ppb Se 1 ppb Ti 0.05 ppb Be 0.1 ppb NH4+ 60 ppm S2- 0.01 ppm

Ordering Information

Model Description Part No Price USD
TEA 4000 SET

System with USB and software.
Measuring Cell
Hanging Mercury Drop Electrode
Glassy carbon electrode
Ref Ag/AgCl electrode
Pt electrode
Electro magnetic valve
Polishing kit
Windows control and reduction software

4000TEA call
Lab Kit

Polarography Standards Cd, Hg Zn Pb, Cu, As, Ni, Ti,Tl, Cr(total) Cr(Vl), Co, Ag, Sn, Fe, Mn, Sn, Se and Al.
4 Flask DI water
1 Dimethyglyoxime
1 Amomonium buffer
1 Acetate buffer
1 Measuring Flask
1 KCl 0.1 mol/L AgCl saturated
1 Variable Pipette 100- 1000 ul
1 pipette tips 1000 ul
1 polishing kit

6030TEA call
Accessories
Gold electrode 4000GE
Platinum electrode 4000PE
HMDE ( hanging mercury drop electrode ) 4000HMDE
Hammer 4000H
Glassy carbon electrode 4000GCE
Electro magnetic valve 4000EMV
Reference Ag/AgCl electrode 4000AG
Application guide 4000APP