ICP-AES法多条谱线测定环境土壤中钒

选用钒的5条特征谱线用电感耦合-等离子发射光谱(ICP-AES)法测定环境土壤中的钒含量,运用干扰系数法对多个土壤标样和样品测定结果进行干扰校正,干扰系数用多个土壤标样的标准值和测定值的最小二乘法来确定.结果表明,未进行校正时,7个土壤标样5条特征谱线测定原始结果和标准值相差较大,不在标准值的范围内；校正后,土壤标样的311.071 nm.波长与309.311 nm波长谱线测定结果的均值在范围之内,且干扰系数为1.015(约等于1),不需折算,波长311.071 nm也在保证值范围内(校正系数为1.184).对土壤样品进行测定,5条谱线测试结果一致性好,相对标准偏差为2.2％～10.4％,平行相对偏差为0.3％～3.3％,加标回收率为88.4％ ～ 111.4％.建议用ICP-AES法对环境土壤中的钒测定时,选用波长311.071 nm谱线并用干扰系数法进行校正(系数为1.184),或用波长311.071 nm与309.311 nm谱线测定均值作为测定结果.

The Research of Measuring the Vanadium(V) Content in Soil by ICP-AES Method for Selecting Several Characteristic Spectrum Lines

The ICP-AES was employed to measure the Vanadium (V) content in soils by selecting five characteristic spectrum lines of V. The standard samples and measured results were calibrated through the interference coefficient method that is determined by solving the least square problem between the reference value and measurements of multiple samples. Our results showed the measurements of five characteristic spectrum lines of V in seven standard samples were beyond the reference value without calibration, whereas both characteristic spectrum lines V311.071 and V309.311of standard samples were in the range of reference value. The interference coefficient was close to one (1.015), thus no conversion was needed. Five characteristic spectrum lines of V in measured samples showed a consistent result, their RSD values were 2.2%-10.4%, parallel opposite deviations ranged from 0.3% to 3.3%, and the recovery ratios were 88.4%-111.4%. In summary, when using ICP-AES for measuring the content of V, the characteristic spectrum line V 311.071 and the interference coefficient method are recommended, alternatively one can choose the averaged value of V 311.071 and V309.311 as the final measurements.