Old Surfactant Solution Causes Problems in Cadmium Reduction Coils In our earlier blog posts we have discussed many reasons for possible loss of cadmium coil reduction efficiency. Along with metal contamination, nitrate contamination and gas contamination, we have also seen old surfactant solution cause problems in cadmium reduction coils. Because of the unstable nature of [...]
Getting the Correct OTCR Cadmium Coil for Your Flow Analyzer In our cadmium coil blog series, we wanted to address the difference between our 12 inch and 24 inch OTCR (Open Tubular Cadmium Reaction) cadmium coils. The 12-inch coil was originally designed to be used on RFA instruments that used a slower pump speed and [...]
Last week, we discussed the loss of reduction efficiency in cadmium coils caused by nitrate contamination in ammonium chloride. This week we are examining metal contamination and cadmium coil efficiency. This type of contamination occurs in the sulfanilamide solution. Of course, sulfanilamide solution contains N-naphthylethylenediamine dihydrochloride which serves to bind heavy metals. If metal exists [...]
Nitrate Contamination: A very real and very well documented effect in various laboratories is the loss of reduction efficiency in cadmium coils caused by nitrate contamination in the ammonium chloride. Nitrate contamination will cause a steady continuous reaction in a cadmium reduction coil during a run. Depending on the level of contamination, this condition can [...]
Two things to consider when using a cadmium coil in a segmented flow analysis system: Pure gas & checking the system for leaks. Pure gas is vital when it comes to the cadmium coil, any impurities in the gas or leaks in the SFA system itself will significantly reduce a cadmium coil's reductive efficiency. In [...]
Get the most life out of your cadmium reduction coil... The Proper Technique to Activate a Cadmium Reduction Coil In order to create a good copper complex it is important to use acid to clean and prepare the surface of the cadmium. Cadmium is very susceptible to destruction if the acid concentration is too high [...]
An Overview of Caring For and Using a Cadmium Reduction Coil in the Determination of Nitrate. Over the years, we've fielded a lot of questions from clients about how to operate and get the most out of their cadmium coils. Cadmium coils are fairly complicated and there are definitely areas for problems to occur. Sometimes [...]
Sample line tubing and connections need more attention with Gas Diffusion Chemistries The gas diffusion methods for analyzing Ammonia, Total Keldahl Nitrogen and the various species of Cyanide have produced a few specific problems not normally seen on classic colorimetric chemistries run on an autoanalyzer. Due to the precise nature of the gas passing across [...]
Further Discussions Our last blog post about how much better Teflon is than glass resulted in extensive responses from many different users. Some users were in agreement, some were thankful for the facts regarding how much better the physical properties of Teflon are over glass and others were somewhat confused. The main confusion has to [...]
- And the Science behind It Years ago when I started working with autoanalyzers, glass was the most common material used to transport and mix fluids and I dutifully learned the art of working with very expensive and easily snapped fragile mixing coils and glass fittings. At the time I was told that glass had [...]
