2.4.2. Conditions and Methods
Arsenic Content, Speciation, and Distribution in Wild Cordyceps sinensis
Evid Based Complement Alternat Med, Feb 19, 2021; DOI: 10.1155/2021/6651498

The analysis conditions, including RF power, plasma gas flow, auxiliary gas flow, nebulizer gas flow, sampling depth, and peristaltic pump rate, were 1250 W, 18 L/min, 1.2 L/min, 0.72 L/min, 6 mm, and 35 r/min, respectively. Besides, selected isotope m/z 75 was detected ion. Samples were quantified with external calibration curve As standards (calibration points: 1, 5, 10, 20, and 50 ng/mL), and internal standards (40 ng/mL of 72Ge) were used for metal determination by ICP-MS. Before determination, the status of ICP-MS was adjusted to optimum with the tuning solution. The internal standard was used, and internal standard solution was introduced into the sample flow with a T shape pipe online. Triplicate analyses were performed for each sample. The corresponding digestion blanks (reagent blanks) were also measured. The arsenic of CRM GBW09588 (Atractylodes macrocephala) was determined and used for quality control purposes using the same methods.