We have been running an ICP-OES (Perkin-Elmer Optima 5300 DV) for five years, feeding it a steady diet of a few percent nitric and/or hydrochloric acid. Just your routine EPA 200.7 and 6010 type of work and everybody's happy. Now we are confronted with a project requiring a matrix of up to 10% sulfuric acid. Most sample introduction components are made of Teflon, glass or quartz. The peri-pump tubing is Tygon and the injector is alumina. Some concerns have been raised over the alumina injector suffering harmful effects. I know alumina is resistant to chemical attack, but are the concerns justified in this case?
Also, can we expect problems with interferences from residual sulfuric after switching back to our routine workload?
Thanks for your input.
Brian Wels, Ph.D.
State Hygienic Laboratory at the University of Iowa
2220 South Ankeny Blvd.
Ankeny, IA 50023