A RAPID METHOD TO DETERMINE TOTAL PHOSPHORUS IN SOILS
A RAPID METHOD TO DETERMINE TOTAL PHOSPHORUS IN SOILS
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DOI：
10.2136/sssaj1988.03615995005200050016x
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发表时间：
1988-09-01
影响因子：
2.9
通讯作者：
BOWMAN, RA
中科院分区：
文献类型：
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作者：
BOWMAN, RA
目前从土壤样品中提取总磷（P）的方法繁琐且耗时。一个快速，精确的提取程序开发中，连续添加浓H2SO4，H2O2，和HF的土壤样品。随后加热10分钟（约10分钟）。423 K）以消除过量的过氧化物。整个过程需要约30分钟。所提出的方法进行了比较，以标准的Na2CO3-融合和HClO4-提取方法。几乎等量的P提取的建议和Na2CO3融合的方法。在HClO_4提取物中发现约7%的P减少。在所提出的方法中，用H2O2处理用于氧化与有机碳相关的P。用HF处理是必要的，以溶解与有机C含量低的桑迪土中发现的铝硅酸盐矿物有关的P。所提出的方法不仅比以前使用的方法更快速，而且使用简单的实验室设备以最低的成本容易地进行。它是特别有用的，用于分析少量的土壤样品，并应是有用的，以评估P动力学在泥沙运移（侵蚀）的研究，并在土壤形成和退化的研究。
Present methods for extracting total phosphorus (P) from soil samples are tedious and the time consuming. A rapid and precise extraction procedure was developed in which sequential additions of concentrated H2SO4, H2O2, and HF were made to soil samples. This was followed by 10 min of heating (.simeq. 423 K) to eliminate excess peroxide. The entire procedure required about 30 min. The proposed method was compared to standard Na2CO3-fusion and HClO4-extraction methods. Almost equal amounts of P were extracted by the proposed and Na2CO3-fusion methods. About 7% less P was found in HClO4 extracts. In the proposed method, treatment with H2O2 was used to oxidize P associated with the organic carbon. Treatment with HF was necessary to solubilize P associated with the aluminosilicate minerals found in sandy soils that are low in organic C. The proposed method is not only more rapid than those previously used, but is easily performed at minimal cost with simple laboratory equipment. It is especially useful for analyzing small numbers of soil samples, and should be useful to evaluate P dynamics in sediment transport (erosion) studies, and in soil formation and degradation studies.