川芎镉含量与栽培土壤pH及活性态Cd含量关系初探

Preliminary Investigation on the Relationship between the Cd content in Ligusticum chuanxiong Hort. and the pH Value and Active-state Cd Content in Cultivated Soil

[目的]初步探讨川芎中镉含量与栽培土壤pH及活性态Cd含量的关系。[方法]采用振荡提取、超声提取和原子吸收法对不同pH川芎栽培土壤各形态镉进行提取和测定,并测定对应川芎药材中的镉含量。[结果]pH值为4.9～5.76的土壤中,离子态镉占镉总含量的52.09%;pH值为7.21～7.53的土壤中,离子态镉占镉总含量的24.11%。两者对应的川芎药材镉含量pH值较大者镉含量相对较低。[结论]土壤的pH值越小,即酸性越大,土壤中离子态镉所占的百分比越高,川芎植物含镉量越大。

[objective] To preliminarily study the relationship between the Cd content in Ligusicum chuanxiong Hort. and the pH value and active-state Cd content in cultivated soil. [ Method] Contents of actlve-state Cd in L, chuanxiong cultivated in soils with different pH values were extracted and detected by oscillation extraction, ultrasonic extraction and atomic absorption method, And the Cd content in corresponding RHIZOMA CHUANXIONG was detected. [ Result ] In soil with pH value between 4, 9 and 5, 76, content of ion-state Cd accounted for 52.09% of the total Cd content. In soil with pH value between 7.21 and 7.53, content of ien-~tate Cd zteeourtted for 24.11%. Cd content in L. chuanxiong was low when the pH value of cultivated soil was high. [ Conclusion] Low pH value of soil had high content percentage of ion- state Cd and great Cd content in L. chuanxiong,