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氢氧化钠——草酸钠法是1964年美国A·H·Al—Abbas 等人提出的。中国科学院南京土壤研究所所著“土壤理化分析”一书,也介绍该法作为测定水稻土有效磷的方法。但由于该法会浸出大量黑、褐色的有机酸,用活性炭也无法去除。所以限制了该法的应用。为此,笔者对氢氧化钠——草酸钠浸提土壤磷的化学反应原理式,进行了一系列的操作技术和溶液配比的改革,用沉淀法去除黑、褐色的有机酸,使本法能测定硷、中、酸性土壤的有效磷,用快速法快速测定南方酸性土壤,特别是富含腐殖质的林业土壤的有效磷。改革后的氢氧化钠——草酸钠法浸提土液稳定性良好,可保留3天,回收率达95%以上,对酸性土壤有效磷的检测灵敏
The sodium hydroxide-sodium oxalate method was proposed by A. Al-Abbas et al. Chinese Academy of Sciences, Nanjing Institute of Soil, “Soil Physical and Chemical Analysis,” a book, but also to introduce the law as a method of determination of available phosphorus in paddy soil. However, due to the law will leach a large number of black and brown organic acids, with activated carbon can not be removed. Therefore, the application of this law is limited. To this end, the author of sodium hydroxide - sodium oxalate leaching soil phosphorus chemical reaction principle, a series of operating techniques and solution ratio reform, the precipitation method to remove black and brown organic acids, the law Can determine the available phosphorus in alkaline, medium and acidic soils, and quickly determine the available phosphorus in the southern acidic soils, especially in humus rich forestry soils. The reforming sodium hydroxide - sodium oxalate leaching soil liquid stability is good, can be retained for 3 days, the recovery rate of 95% or more, the detection of available phosphorus in acidic soil