Abstract: The contents of residue chloramphenicol in 3 sawples of fresh cultured prawn and 2 sawples of exported culturedprawn from Zhanjiang aquatic products market were determined by RIA. The result showed that the limit of determination ofRIA method was 0.15×10-12. The content, of remained chloramphenicol in samples kinds of fresh cultured prawn were higher than0.15×10-12, and was lower than 0.15×10-12 in 2 exported samples of cultured prawn. It suggested that RIA could be used as anefficacious method for determining on residue chloramphenicol in aquatic products.

Key words: RIA (Rdioimmunoassay), chloramphenicol, cultured prawn