The ampoule was degassed using nitrogen gas continuously about 15 min after which it was sealed.
The ampoule of 9-mm inner diameter was placed in a rocking furnace.
The ampoule was connected to the sample chamber by a copper pipe.
The ampoule tube was periodically removed from the oven for observation.
The ampoule was flash-frozen in liquid nitrogen and stored frozen until it was broken open in the anaerobic chamber.
The ampoule was connected to a vacuum line, evacuated, sealed off, and placed in oil bath at 160°C.
The ampoule was sealed under vacuum and heated up to 900 °C in a rocking furnace for 10 h followed by quenching into water from 700 °C.
The ampoule was inverted at frequent intervals to observe gel formation, and the gelation time was noted as the time when the gel strength did not change.
The ampoule was sealed under a vacuum and heated at 900 °C in a rocking furnace for 10 h, followed by quenching into room temperature water from 700 °C.
The ampoule of mixed organochlorine pesticide standards consisted of α-HCH, β-HCH, γ-HCH, δ-HCH, 4,4´DDT, 4,4´DDE and 4,4´DDD and was obtained from Supelco (Belle-Fonte, USA).
The ampoule of mixed of organochlorine pesticide standards consisted of α-HCH, β-HCH, γ-HCH, δ-HCH, 4,4′DDT, 4,4′DDE, 4,4′DDD was obtained from the Supelco (Belle Fonte, USA).
