Question

Your laboratory is equipped with the systems included in the list below. Which GC system would you select from this list for each of the following analyses? You may use each system choice only once.

(10 pts) Your laboratory is equipped with the systems included in the list below. Which GC system would you select from this list for each of the following analyses? You may use each system choice only once. Indicate your answers on the answer sheet. a) analysis of organophosphate pesticides in agricultural runoff answer: b) analysis of residual solvent in polymeric filtration media answer: c) analysis of fixed gases over a fermentation reactor for beer production answer: d) analysis for mercury in photographic chemicals answer: e) analysis for traces of melamine (2,4,6-triamino-s-triazin) in baby formula answer: System choices: A) splitless injection; diethylene glycol succinate (common name - DEGS) capillary column; FID B) split injection; dimethylpolysiloxane (common names - SE-30, OV-1, HP-1, DB-1) cap. col.; AED C) gas sample valve; molecular sieve (common name – Carbosieve S-II PLOT) column; TCD D) headspace sampling; 50% methyl / 50% phenyl polysiloxane (OV-17, HP-17, DB-17) cap. col.; MSD E) extraction; derivatization to yield a volatile analyte; splitless injection; 5% phenyl methyl silicone (common name - DB-5, Elite5) cap. col.; MSD F) splitless injection; 5% phenyl methyl silicone (common name – DB-5, Elite5) cap. col.; NPD

Answer 1

A.

Analysis of organophosphate in agricultural runoff: F. splitless injection, DB-5, NPD (nitrogen phosphorus detector )

B.

Analysis of residual solvent : D : Headspace analysis approach

C.

analysis of fixed gases over bioreactors: Gas sampling valve approach

D.

analysis for mercury in photographic chemical: A. Splitless injection, FID

E.

melanin traces analysis in baby formula: E. Extraction, derivatization, splitless injection.