4. Conclusion
The result obtained from this study was with regard to the GC–MS/MS method followed by liquid phase extraction with ethyl acetate after derivatization; in this case, LOD of cyanide up to 260 times lower than EPA water quality criteria were obtained.
Additionally, optimized derivatization, extraction and instrumen-tal conditions demonstrated that routine analyses of cyanide residues in real surface water samples can be carried out sensitively and confidently.