I want to assess the level of toxic metals, essential metals and ions especially Na,K,F from disease suspected water sample using ICP-MS. Is there any specific percentage for conHNO3 for storage of water?
It is specified in APHA's (American Public Health Association) 'Standard Methods for Water and Wastewater'.
I'm going to give this answer in the form of an example. I've worked on ground and river waters analysing for both majors and tracers. My main focus was arsenic but we also measured the heavy metals. We acidify to < pH 2 for the cation samples which are run on ICP-MS and not for anion samples (which are run on IC). We also filtered to
Make HNO3 in 1:1 ratio from AR HPlC grade concentrated HNO3. Furthermore, add few drops of 1:1 HNO3 in water sample until the pH reach ~ 2 and stored below 4 c for further analysis.
Keep it low. Typical storage uses 2-5 mL of HNO3 per liter of water. Remember to rinse your bottles with HNO3 prior to use. We use 20% HNO3 for the rinsing, and store the bottles with 1N HNO3 overnight prior to use for trace elements (
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