土壤重金属含量对烟叶和烟气中重金属的影响

针对Cd、Pb、Hg、Cr四种元素,采用大田换土法研究了土壤、烟叶、烟气三者间重金属的定量关系,并对吸烟过程中重金属的挥发量进行了分析。结果表明,Cd在烟叶及烟支相应部分的含量随土壤Cd处理浓度的增加而极显著增加,土壤、烟叶、烟气中的Cd含量两两间呈极显著正相关;不同处理下Hg、Pb、Cr在烟叶及烟支相应部分的含量亦存在显著或极显著差异,但随处理浓度的变化无明显变化,三种元素的烟气含量与烟叶浓度呈极显著正相关。在吸烟过程中,烟支中Cd和Hg的挥发性较大,烟头和过滤嘴的吸附量较小;Pb和Cr则反之。

The Effect of Soil Heavy Metal Contents on Heavy Metals in Tobacco Leaves and in the Course of Smoking

In order to provide experimental evidence for practical safety measure in tobacco production,the quantitative relationship of Cd,Pb,Hg and Cr contents among soil-tobacco-smoke was investigated by displacing soil in field,as well as the volatile quantity of heavy metal elements in the course of smoking.The results showed that the Cd contents in tobacco leaves and cigarettes increased with soil Cd content at 1% significant level.There were 1% significantly positive correlations among Cd contents in soil,tobacco and smoke.The contents of Hg,Pb and Cr in tobacco and the corresponding part of cigarettes changed at remarkable or extremely remarkable level as that in soil changed.However,there was no notable regular variation.The results also showed high significant positive correlation between Hg,Pb and Cr contents in smoke and those in tobacco.The volatility of Cd and Hg in cigarette were very high and their absorption capacity in cigarette butt and filter tip in the course of smoke were very low.However,volatile quantity of Pb and Cr were lower and their absorption capacity in cigarette butt and filter tip were higher.