Page 80 - ENGINEERING REVIEW NOVEMBER 2022_Neat

ENGINEERING
REVIEW TECH INNOVATION

Metal ions assaying in

an electroplating bath

etal casting is a process of melting metal and giving HI932 Potentiometric Titrator with specific ion selective
it a shape using moulds. This process involves high electrode is used. For Cadmium analysis - HI4003 (Cadmium
Mtemperature and accuracy of the different metal Half-Cell Ion-Selective Electrode ISE), for Copper HI4108
concentrations. These metals can be ferrous or non-ferrous (Copper Combination Ion-Selective Electrode ISE) and for
compounds. The electroplating process where these metals Calcium - HI4104 (Calcium Combination Ion-Selective
are coated with a thin metal film is a less expensive method of Electrode ISE)is used. Zinc can be analyzed with Calcium
turning an old metal into a brand new one. These methods of ISE. To stabilize the solution pH buffers are used. The HI931
forging and casting challenge environmental sustainability. & HI932 works seamlessly with the HI922 Autosampler for
With strict rules and regulations in managing industrial the automation ion of up to 18 samples. A real time titration
waste, the major hurdle that industries face is treating and curve can be displayed during each titration. Burette with
discarding wastewater. The electroplating or casting water 0.1% dosing accuracy could provide accurate result. This
contains heavy metals and is hazardous to marine and human potentiometric titator can perform any number of standard
life. Metals like Zinc, Chromium, Nickel, Copper and Cadmium titration, back titration as well as direct ion selective reading.
are high in concentration. It is necessary for industries to
optimize the water before discarding it in water bodies. For more information,
Either industries have their own treatment set-up or they use Email: marketing@hannainst.in
centralized effluent treatment plants.

Measuring plating solutions
The plating solution is measured in several ways. Atomic
absorption and emission spectroscopic techniques
are accurate, selective, and measure a wide range of
concentrations. Gravimetric analytical methods, where the
metal is precipitated from the solution and weighed, requires
adding chemicals and using costly equipment which increases
time and space requirements. Titration is another way to
analyze metals in plating baths. Metals such as copper,
nickel, and zinc, react with EDTA and can be determined by
Complexometric titration. Titrations are more cost-effective
than atomic absorption and spectroscopy.

Hanna’s offerings
To determine the concentration of specific ions, Hanna HI931/

76 | NOVEMBER 2022