This morning we continued to read articles and catch up on latest research in the field. Then in the afternoon we started making calibration samples. I am making 10 samples, each 10 mL. They each have 1 ppm of Co, 0-5 ppm of Mg and Na, and 0-1 ppm of P. The rest of the sample is water. I started out with the water. Came out fine on the percent errors. However I had to redo three of the samples next, when I added the Co. Third, I added the Na. Some of the percent errors were a little high, but not high enough to redo the samples. Today I will finish adding the Mg and P.