Page 372 - Multidimensional Chromatography

Reference 98 99 91 90 95 97

b
LOD (ng l 1 ) 3 n.s. 10–100 100 0.4–6.0 1–10 10 n.q. n.s.

a
Detection NPD FID NPD FID NPD FPD NPD MS FID

0.53) 0.53) 0.32) 0.32) 0.32) 0.53) 0.53)
Examples of the application LC–GC in environmental analysis

GC system mm) (m Deactivated (2 Carbowax 20M 0.4 m 0.32) 0.4 m Carbowax 20M 0.32) Deactivated (5 0.17 m HP1 0.32) Deactivated (5 0.5 m DB-5 (3 m DB-5 0.32) Deactivated (5 0.14 m DB-1 0.32) Deactivated (10 0.2 m CP Si1–19 CB 0.32) Deactivated (10 not given 0.5 m DMS 0.32)

RG: PC: (3 AC: (40 RG: AC: (25 RG: PC: 0.5 AC: (25 RG: AC: (15 RG: AC: (50 RG: PC: AC: (25

Interface/ Transfer volume/solvent Loop type 150 l methanol/water 40) with 5% : (60 1-propanol On-column 75 l ethyl acetate On-column 70 l ethyl acetate On-column 100 l ethyl acetate Loop type 500 l methyl-t-butyl ether with 10% ethyl acetate; co-solvent, 100 l n-decane On-column loop type 350 l pentane dichloromethane (50-50)

LC column mm) 5 m Spherisorb 2) m Krosil C 18 3.1) 10 m PLRPS 2) Thick extraction 4.2) discs 10% 90% C 18 , 10 m PLRP-S 2) Drying cartridge 15–25 m PLRP-S 2) 2)

13.2 (mm (100 ODS 5 (100 SPE: (10 (15 XAD (10 (10 5 m Silica (100

Table
Sample volume (ml) 10 0.098 2.5 10 2 20 l of hexane extrate from SFE

Sample Water Water Water Water Water Urban air particulate extracts

Analyte Atrazine Polycyclic aromatic hydrocarbons Organo- phosphorus pesticides Organo- phosphorus and organo- sulfur pesticides Organo- phosphorus pesticides Alkylated, oxygenated and nitrated polycyclic aromatic compounds