Analysis of metal ions in urea solutions
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Our products require the use of urea solutions, and we need to determine the content of metal ions in them. Our analysts say that organic substances can affect the instruments; are there any preprocessing methods that would allow us to use ICP to analyze the metal ions in urea solutions?
The molecular formula of urea is CO(NH2)2; theoretically, no residue remains upon complete combustion. The GB/T 9741-1988 method for determining burning residues can be used for pretreatment, and what remains should be metal-containing salts.
Check the pharmacopoeia; it contains the analysis methods
The main metal ions that may be introduced during the urea production process include Fe, Cr, Ni, etc. There are established analytical methods for these ions; the poster can search on this forum or consult relevant manuals.
In ICP analysis, slag is generally analyzed for ash content, and that level is quite high
If it is urine, the nickel and iron contents can be determined by direct colorimetry; chromium is present in very trace amounts, and it can be measured using atomic absorption spectroscopy – just make sure to acidify the sample first
We produce urea, and we generally only test for iron and nickel in it, using colorimetry for the determination