Figure 6.

Scheme of the device used for head-space analysis of gas phase under quercetin solution during oxidation by air oxygen: 1 – vessel with solution; 2 – magnetic stirrer; 3 – gas tubes; 4 – manometer connection; 5 – gas outlet connection; 6 – gas inlet connection; 7 – digital pressure meter; 8 – circulating pump; 9 – heated gas injection valve; 10 – gas sampling loop; 11 – carrier gas supply; 12 – gas chromatograph; 13 – packed column with molecular sieves (zeolites); 14 – packed column with Porapak Q.