posted by Chris .
A Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 291 units was obtained for the intensity of the 671 nm red emission line. Then 1.00 mL of a 11.7 mM Lithium standard was added to 9.00 mL of serum, and this spiked serum gave an intensity reading of 729 units. What is the original concentration of Li in the serum?
You have posted this numerous times in the last day or so. I don't know how the units are displayed; if you have an answer post it. I may be able to help if I can figure out the units and I can do that if I have an answer.