Analysis of 0.1M H3PO4 and 0.5N NaOH extracts by 7800

Question

Hello, we perform extractables testing at my lab and we have an upcoming study of single-use thermoplastic elastomer tubing which will be extracted in the following solvents: water, 0.1M H3PO4 and 0.5N NaOH. I am obviously not concerned about running the water sample, but what other sample prep/instrument setup steps should I consider with the other two extracts? I have a 7800 with an SPS4 autosampler, quartz Scott-type double pass spray chamber and micromist nebulizer. I typically run acid extracts/digests of HNO3/HCl and I am unfamiliar with running other solvents on this system and do not want to harm the instrument. Thank you for your help!

edgarvs · Accepted Answer

Hi srains , The problem is the NaOH. That leaches out the glassware. However, if the concertation is low then there is no big leaching effect and no problem and you can measure with the same sample intro setup, but another set of glassware. So one set of glassware (nebulizer, spraychamber, transfer tube, torch) for the HNO3/HCl samples and one set for the Basic solution. this give the best stability for both analysis. If you want to measure elements like Na, Si and B in the basic solution then you need the pfa spraychamber and torch setup.