adding standard recovery的用法和样例：
- 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%.
- 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.
- With adding standards to the mineral matrix, the recovery of n-alkane, fatty acid, cholesterol is 94.8%, 90.8% and 98.8% respectively.
- Researchers studying patients addicted to opiates or cocaine found little benefit to incorporating IPT into the standard recovery programs.