关键词: 交换性铝, 电感耦合等离子体, 测定方法

Abstract: To analyze the soil exchangeable aluminum contents of soil samples, the inductively coupled plasma atomic emission spectrometry (ICP-AES) method was applied and compared with the neutralization titration method. Variance analysis showed that the measured value between the two methods was not statistically significant (P>0.05). The soil exchangeable aluminum was extracted using the soil-water ratios of 1∶50 and 1∶25, respectively, and then determined by both ICP-AES and neutralization titration method. Variance analysis showed that the aluminum content under 1∶50 extraction ratio was significantly (P<0.01) lower than that under 1∶50 extraction ratio. Two kinds of sample weight (5 g and 2 g) were also compared. It was shown that the soil sample weight could be cut down to 2 g. The optimum wavelength of analytical spectral line was 396.1 nm for soil exchangeable aluminum determination by ICP-AES, and the aluminum concentration for the standard curve was suggested as 0-50 mg·L^-1. The detection limit, limited quantity and recovery rate of aluminum were 0.050 mg·L^-1, 0.168 mg·L^-1 and 98%, respectively.

Key words: exchangeable aluminum, inductively coupled plasma, determination method