摘要
本研究是采用分光光度法测定土壤硫的一种新方法.紫红色溶液光谱特性在540nm时有最大吸收值.适宜酸度为0.18mol L^(-1)(1/2H_2SO_4),在2h内溶液吸收值基本不变,测定线性范围0～2.0μg SO_4—S/ml,方法的最低检测浓度为0.17μg SO_4—S/ml,精密度好,主要干扰离子为磷酸根,可以加入CaCl_2消除.实际测定样品SO_4—S含量与参比法结果无显著差异.
This is a new method for determiny sulfale in soil. The maximum absorption of the solution is at 540 nni. Optiniun acidity for colour reactions keeps at 0. 18 molL-1 (1/2 H2SO4). The colour stands stably within 2 hours. The linear calibration curve ranges from 0 to 2 μg ml-1. The lowest determination concentration is 0. 17μg SO4-sml-1. The method is compared with the BaSO4 turbidimetric. Showing a very similar correlation in the results and their results are very colosed.
出处
《华南农业大学学报》
CAS
CSCD
1993年第2期116-120,共5页
Journal of South China Agricultural University
