土壤中交换性铝含量的测定方法改进

发布时间：2018-05-15 23:41

本文选题：土壤 + 交换性铝　；参考：《福建农业学报》2016年03期

【摘要】：根据铝试剂与铝反应形成红色络合物的原理,在测定波长、反应温度、显色时间、缓冲溶液酸度、显色剂用量和掩蔽剂用量等测定条件优化的基础上,分别采用改进的分光光度法和全自动间断化学分析法测定了土壤中的交换性铝含量,并与国家标准方法比较。结果表明,优化后的分光光度法中的铝浓度在0~0.5mg·L~(-1)范围内与吸光度呈良好的线性关系,相关系数为0.999 4;全自动间断化学分析法中的铝浓度在0~2.5mg·L~(-1)范围内与吸光度的线性关系良好,相关系数为0.999 6。两方法用于土壤样品中交换性铝测定的回收率分别为95.90%~101.16%和99.83%~104.34%,相对标准偏差平均值分别为1.913%和1.861%。所建立的两种方法均具有快速、准确的特点。其中,全自动间断化学分析法在自动化程度、分析速度和试剂消耗量等方面更优,是一种新的测定土壤中交换性铝的理想方法。
[Abstract]:According to the principle of the reaction of aluminum reagent with aluminum to form red complex, the determination conditions were optimized, such as the determination wavelength, reaction temperature, color reaction time, acidity of buffer solution, amount of color developing agent and masking agent, etc. The content of exchangeable aluminum in soil was determined by improved spectrophotometry and automatic discontinuous chemical analysis, and compared with the national standard method. The results show that the Al concentration in the optimized spectrophotometric method has a good linear relationship with the absorbance in the range of 0~0.5mg L ~ (-1), the correlation coefficient is 0.999, and the linear relationship between the Al concentration in the automatic discontinuous chemical analysis method and the absorbance is good in the range of 0~2.5mg ~ (1). The correlation coefficient is 0.999. The recoveries of the two methods for the determination of exchangeable aluminum in soil samples were 95.90% 101.16% and 99.83% 104.34, respectively. The average relative standard deviations were 1.913% and 1.861%, respectively. The two methods are fast and accurate. Among them, automatic discontinuous chemical analysis is a new ideal method for the determination of exchangeable aluminum in soil, which is superior in automation, analytical speed and reagent consumption.
【作者单位】：福建农林大学生命科学学院;福建农林大学资源与环境学院;福建农林大学林学院;
【基金】：国家自然科学基金(31370609)
【分类号】：S153

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