酸性土壤水溶性氟浸提方法的研究  

Study on the Extraction Method for Water-extracted Fluorine in Acid Soils

作　　者：蒋倩[1] 韩勇[1] 孙晓丽[1] 华建峰[2] 倪俊[1] 

机构地区：[1]中国科学院南京土壤研究所土壤与环境分析测试中心,南京210008 [2]江苏省中国科学院植物研究所,南京210014

出　　处：《土壤》2012年第1期140-143,共4页Soils

基　　金：国家自然科学基金青年科学基金项目(41101232);江苏省自然科学基金项目(BK2011688);中国科学院南京土壤研究所创新领域前沿项目(ISSASIP0727)资助

摘　　要：本文比较研究了振荡、超声、沸水浴和烘箱4种浸提酸性土壤水溶性氟的方法,然后采用离子色谱法对浸提液进行测定,并通过对测定数据进行统计与方差分析来确定最佳浸提方式。结果显示,水土比5:1,浸提时间20 min、温度60℃是振荡法与超声法浸提酸性土壤水溶性氟含量的最佳条件。在此条件下,振荡法与超声法浸提的土壤水溶性氟含量无显著差异,标准偏差均小于0.3%。超声法浸提的酸性土壤水溶性氟含量显著高于各自最佳处理条件下的沸水浴法与烘箱法浸提的水溶性氟含量。在离子色谱测定水溶性氟过程中,质量控制样品均在1倍标准偏差范围内。因此,采用离子色谱法测定超声法或振荡法浸提的酸性土壤水溶性氟是一种可行的、准确的试验方法,特别对于批量土壤样品的测定具有重要意义。Four different methods including shaking, ultrasonic, boiling water and oven used to extract Fluorine （F） in acid soils by water were compared in this experiment. And then ihe concentration of F was determined by Ion Chromatogram （IC）, The results showed that 20 rain extracting time and 60℃ treating temperature wore the optimal extraction conditions for the methods of shaking and ultrasonic when the ratio of water to soil was 5：1. No significant difference in the concentrations of F was tbund between these two methods and their standard deviations were both lower than 0.3%. Furthermore, the concentration of F extracted by ultrasonic was significantly higher than those extracted by boiling water or oven in their optimal conditions, respectively. Quality controls were carried out during the experiment and the values were within one standard deviation. Therefore, the methods of ultrasonic and shaking will be effective to extract F in acid soils, especially for determination of batches of soils in laboratory.

关 键 词：酸性土壤 水溶性氟 浸提方法 超声 离子色谱法 

分 类 号：O657.75[理学—分析化学]