火焰原子吸收光谱法测定煤矸石土种植的农作物中金属元素含量

采用干灰化法消化样品,火焰原子吸收光谱法测定了煤矸石土种植植物中的钙、镁、铜、锌、铁、锰等6种金属元素的含量。6种元素均在一定的质量浓度范围内与其吸光度呈线性关系,方法的检出限(3s)在0.002～0.017mg.L-1之间。回收率在96.8%～106.1%之间,相对标准偏差(n=6)在0.17%～4.25%之间。方法用于煤矸石土和沙土上种植的玉米、蚕豆和豌豆中6种金属元素含量的测定,结果表明:煤矸石土上种植粮食中6种元素的含量均高于沙土上种植的,矸石土壤种植的蚕豆中镁含量较高,豌豆中铁和锰含量较高。

FAAS Determination of Metal Elements in Crops Grown in Coal Gangue Soil

The sample of crops grown in coal gangue soil was treated by dry ashing method,and the contents of 6 elements,including Ca,Mg,Cu,Zn,Fe and Mn,were determined by FAAS.Linear relationships between values of absorption and mass concentration of 6 elements were obtained in the definite ranges,with detection limits(3s) in the range of 0.002-0.017 mg·L-1.Values of recovery and RSD′s(n=6) found were in the ranges of 96.8%-106.1% and 0.17%-4.25% respectively.The proposed method was applied to the determination of the 6 elements in corn,horsebean and pea grown in coal gangue soil and sandy soil,and the result indicated that the contents of 6 elements in crops grown in coal gangue soil were higher than those grown in sandy soil.Relatively higher contents of Mg were found in broad-bean,and of Fe as well as Mn were found in pea,which were grown in coal gangue soil.