A pot experiment was conducted to study the Pb-Zn compound pollution on tobacco.The result showed that Pb-Zn compound pollution was more complicated than single heavy metal pollution.The interaction of Zn and Pb resulted in an decrease of Pb uptake and an increase of Zn uptake in roots of tobacco with the increase of Zn concentration in soil,which showed a compition effect between Pb and Zn;While Pb uptake in leaf and stalk was more complicated: when Zn concentration in soil ≤100 mg·kg-1,Pb uptake in leaf and stalk increased,which showed an additive effect;when Zn concentration in soil>100 mg·kg-1,Pb uptake in leaf and stalk decreased,which showed an antagonistic effect.In addition,Zn uptake in each tissues of tobacco increased with the increase of Zn concentration in soil,but independent of Pb concentration.
The continuous adsorption of Cd 2+ on vermiculite was studied,in addition the modification and regeneration of the adsorbent were inspected.The results showed that vermiculite had a strong adsorption effect and the successive operation of adsorption to Cd 2+ was practical;The adsorption capacity of vermiculite can be remarkably increased when modified with 1mol/L HCl or 1mol/L NaCl.Moreover the adsorbent can be readily regenerated with 1mol/L NaCl and used repeatly.
Concentrations of zinc,iron,copper,manganese,selemium,lead and mercury in six types of Chinese herbal medicine for rheumatism were determined by AAS.The results showed that the types of Chinese herbal medicine for rheumatism all have a large amount of Fe,Zn,Cu and Mn.In paste type,the amount of Zn is the highest,in other types,the amount of Fe is the highest.In addition,there also exist some amount of Pb and Hg,which is harmful to human body.
