adding standard sample的用法和样例：
- The recovery experiment by adding standard samples was carried out for corn samples with addition of two-level vomitoxin, the average recovery ratio was 84.
- The carbon nanotube was digested by a chemical method, and the Boron content was determined by ICP-AES.The recovery ratio obtained by adding standard Boron sample was 101.9%.
- Petri: I can't remember whether we keep the standard sample, any inputs?
- The AppML