Answer all question according to ISO 17025 standard

2) You have analysed a milk powder CRM for Cd. You found a mass fraction of 1.12 mg/g in the first analysis. After 8 months another measurement gave 1.04 mg/g. According to the instructions for use you have to correct the result for dry mass. The first time bottle is opened, 1.0025 g of the CRM was weighed, oven drying at 102 C yielded a constant weight of 0.9665 g after 16 hrs. The second time (after 8 months), 1.0011 g of the CRM, oven drying at 102 C yielded a constant weight of 0.8988 g after 16 hrs. i) Calculate dry mass corrected Cd mass fraction for both measurements. ii) Calculate the moisture content change of the material in 8 months. iii) What will be your recommendation for further storage