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Basic Values for Titration

Tue, 07/06/2010 - 9:38am

Equipment Used in Titration
Equipment Used in Titration. Click to enlarge.
Titration is one of the oldest chemical procedures used in the research lab, having first been published by Karl Friedrich Mohr in 1855. This standard laboratory method is performed to determine the precise endpoint of a reaction or the concentration of a known reactant, which are revealed through the use of an indicator changing color or a rapid change in pH on a pH meter.

“The greatest technical challenge for titration systems lies in the ability to simplify a complex workflow, from sample preparation and sample analysis to the reporting of the experimental results,” says Steve Johnson, business manager for Lab Analytical Products at Mettler Toledo. “Customers [researchers] demand a ‘one-click’ solution that satisfies all aspects of their testing regimen. Initial product training, technical expertise, and field service support are all required elements of the overall solution.”

Titration Applications
Titration Applications. Click to enlarge.

Type of Titration Performed.
Type of Titration Performed. Click to enlarge.

“Some major focus areas for future titration systems will target areas involving improvements in instituting Good Titration Practices as well as measurable advancements in applications of green chemistry, user safety and automation,” Johnson continues.

According to a recent reader survey on the use and application of titration systems in research labs performed by the editors of Laboratory Equipment in June 2010, the top issues are precision, reliability, repeatability, and ease-of-use. All of these aspects were noted by more than half of all the respondents. These are mostly generic issues that are noted on most instrument surveys of this type. What is interesting about these responses, compared to the other surveys, is the absolute level of the response rate—from 65% to 55% for these four items. This is significantly higher than other surveys, revealing the importance of these issues, or the possible lack of adequate characteristics with these issues in current titration equipment.
Issues in Titration
Issues in Titration. Click to enlarge.
It’s also interesting to note the relative low response for some of the other issues, like waste (10%), indicators (12%), throughput (14%), and flexibility (15%).

Titration Categories Worked In
Titration Categories Worked In. Click to enlarge.
Automation is one of the big attributes of currently available titration instruments. Suppliers of these instruments make it a point to indicate that their devices provide accurate and reproducible results, are easy to use, and have attractive cost-benefit ratios. Automation and cost efficiency were also chosen by the survey respondents as issues in titration devices, but to a lesser degree than the precision, et al. Similarly, only about a third of the survey respondents revealed that they used automation systems in their titration work. This is about half the level of those who used pH meters and analytical balances—the prime tools for this work.

Current instruments also feature maximized flexibility, plug-and-play operation, and “time-optimized” processing. These particular items were not noted as issues with titration systems, likely revealing the acceptance of these characteristics in current devices as basic requirements.

Source: Laboratory Equipment

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