Investigated in this paper was the absorbing and distributing of nicotine in the tobacco and filter tip during the course of smoking, gas Chromatography being used.The experimental result indicated that the nicotine i...Investigated in this paper was the absorbing and distributing of nicotine in the tobacco and filter tip during the course of smoking, gas Chromatography being used.The experimental result indicated that the nicotine in the suck part of cigarette was absorbed by tobacco and filter tip together.Before the cigarette was sucked to 3/4,the nicotine in the left tobacco and filter tip being accounted to about 90% of the total,the part entered into the body is less than 10%. But if the cigarette was sucked to the end,about 50% of the whole nicotine would entered into the body.展开更多
FIA spectrophotometry was studied to analyse the content of phosphorus in phosphorous composite fertilizer.NH 4VO 3 (NH 4) 2MoO 4 developing agent was used as carrier.The interference of EDTA was eliminated by increas...FIA spectrophotometry was studied to analyse the content of phosphorus in phosphorous composite fertilizer.NH 4VO 3 (NH 4) 2MoO 4 developing agent was used as carrier.The interference of EDTA was eliminated by increasing the concentration of (NH 4) 2MoO 4.And other ions had no effect on determination.The linear breadth was 4～8mg/100ml P 2O 5,RSD≤5%,RE≤5%.The method had the advantages of rapidness、simplicity and accuracy.展开更多
文摘Investigated in this paper was the absorbing and distributing of nicotine in the tobacco and filter tip during the course of smoking, gas Chromatography being used.The experimental result indicated that the nicotine in the suck part of cigarette was absorbed by tobacco and filter tip together.Before the cigarette was sucked to 3/4,the nicotine in the left tobacco and filter tip being accounted to about 90% of the total,the part entered into the body is less than 10%. But if the cigarette was sucked to the end,about 50% of the whole nicotine would entered into the body.
文摘FIA spectrophotometry was studied to analyse the content of phosphorus in phosphorous composite fertilizer.NH 4VO 3 (NH 4) 2MoO 4 developing agent was used as carrier.The interference of EDTA was eliminated by increasing the concentration of (NH 4) 2MoO 4.And other ions had no effect on determination.The linear breadth was 4～8mg/100ml P 2O 5,RSD≤5%,RE≤5%.The method had the advantages of rapidness、simplicity and accuracy.
